CVE-2026-50012 | Medium | 5.5 | 2026-07-16 | Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_di… |
CVE-2026-47729 | Medium | 6.5 | 2026-07-16 | Squid is a caching proxy for the Web. Prior to 7.6, due to an improper validation of syntactic correctness of input in the FTP gateway (src/clients/FtpGateway… |
CVE-2026-33526 | High | 7.5 | 2026-03-26 | Squid is a caching proxy for the Web. Prior to version 7.5, due to heap Use-After-Free, Squid is vulnerable to Denial of Service when handling ICP traffic. Thi… |
CVE-2026-33515 | Medium | 6.5 | 2026-03-26 | Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traff… |
CVE-2026-32748 | High | 7.5 | 2026-03-26 | Squid is a caching proxy for the Web. Prior to version 7.5, due to premature release of resource during expected lifetime and heap Use-After-Free bugs, Squid i… |
CVE-2025-62168 | Critical | 10.0 | 2025-10-17 | Squid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication credentials in error handling allows information… |
CVE-2025-59362 | Medium | 4.0 | 2025-09-26 | Squid through 7.1 mishandles ASN.1 encoding of long SNMP OIDs. This occurs in asn_build_objid in lib/snmplib/asn1.c. |
CVE-2025-54574 | Critical | 9.3 | 2025-08-01 | Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution attack when p… |
CVE-2024-45802 | High | 7.5 | 2024-10-28 | Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to Input Validation, Premature Release of Resource During Expected… |
CVE-2024-37894 | Medium | 6.3 | 2024-06-25 | Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to an Out-of-bounds Write error when assigning ESI variables, Squid is suscepti… |
CVE-2024-25111 | High | 8.6 | 2024-03-06 | Squid is a web proxy cache. Starting in version 3.5.27 and prior to version 6.8, Squid may be vulnerable to a Denial of Service attack against HTTP Chunked dec… |
CVE-2024-25617 | Medium | 5.3 | 2024-02-14 | Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerab… |
CVE-2024-23638 | Medium | 6.5 | 2024-01-24 | Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6 is vulnerable to a Denial of Service attack against C… |
CVE-2023-50269 | High | 8.6 | 2023-12-14 | Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 th… |
CVE-2023-49288 | High | 8.6 | 2023-12-04 | Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Affected versions of squid are subject to a a Use-After-Free bug which can lead to… |
CVE-2023-49286 | High | 8.6 | 2023-12-04 | Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to an Incorrect Check of Function Return Value bug Squid is vulnerable to a Den… |
CVE-2023-49285 | High | 8.6 | 2023-12-04 | Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Buffer Overread bug Squid is vulnerable to a Denial of Service attack agai… |
CVE-2023-46728 | High | 7.5 | 2023-11-06 | Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service at… |
CVE-2023-5824 | High | 7.5 | 2023-11-03 | A flaw was found in Squid. The limits applied for validation of HTTP response headers are applied before caching. However, Squid may grow a cached HTTP respons… |
CVE-2023-46848 | High | 8.6 | 2023-11-03 | Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs in HTTP Request messages or constructing ftp:// URLs… |
CVE-2023-46847 | High | 8.6 | 2023-11-03 | Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by writing up to 2 MB of arbitrary data to heap memory… |
CVE-2023-46846 | Critical | 9.3 | 2023-11-03 | SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote attacker to perform Request/Response smuggling past firewall… |
CVE-2023-46724 | High | 8.6 | 2023-11-01 | Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions 3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled us… |
CVE-2022-41318 | High | 8.6 | 2022-12-25 | A buffer over-read was discovered in libntlmauth in Squid 2.5 through 5.6. Due to incorrect integer-overflow protection, the SSPI and SMB authentication helper… |
CVE-2022-41317 | Medium | 6.5 | 2022-12-25 | An issue was discovered in Squid 4.9 through 4.17 and 5.0.6 through 5.6. Due to inconsistent handling of internal URIs, there can be Exposure of Sensitive Info… |
CVE-2021-46784 | Medium | 6.5 | 2022-07-17 | In Squid 3.x through 3.5.28, 4.x through 4.17, and 5.x before 5.6, due to improper buffer management, a Denial of Service can occur when processing long Gopher… |
CVE-2021-41611 | High | 7.5 | 2021-10-18 | An issue was discovered in Squid 5.0.6 through 5.1.x before 5.2. When validating an origin server or peer certificate, Squid may incorrectly classify certain c… |
CVE-2021-31807 | Medium | 6.5 | 2021-06-08 | An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a remote server to achieve Denial of Service when deliver… |
CVE-2021-33620 | Medium | 6.5 | 2021-05-28 | Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The iss… |
CVE-2021-31808 | Medium | 6.5 | 2021-05-27 | An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is vulnerable to a Denial of Service attack (against all… |
CVE-2021-31806 | Medium | 6.5 | 2021-05-27 | An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all… |
CVE-2021-28662 | Medium | 6.5 | 2021-05-27 | An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain response header over HTTP or HTTPS, there is a denial… |
CVE-2021-28652 | Medium | 4.9 | 2021-05-27 | An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache M… |
CVE-2021-28651 | High | 7.5 | 2021-05-27 | An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with… |
CVE-2020-25097 | High | 8.6 | 2021-03-19 | An issue was discovered in Squid through 4.13 and 5.x through 5.0.4. Due to improper input validation, it allows a trusted client to perform HTTP Request Smugg… |
CVE-2021-28116 | Low | 3.7 | 2021-03-09 | Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This ca… |
CVE-2020-15811 | Medium | 6.5 | 2020-09-02 | An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP an… |
CVE-2020-15810 | Medium | 6.5 | 2020-09-02 | An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling attacks may succeed against HTTP an… |
CVE-2020-24606 | High | 8.6 | 2020-08-24 | Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Ca… |
CVE-2020-14059 | Medium | 6.5 | 2020-06-30 | An issue was discovered in Squid 5.x before 5.0.3. Due to an Incorrect Synchronization, a Denial of Service can occur when processing objects in an SMP cache b… |
CVE-2020-14058 | High | 7.5 | 2020-06-30 | An issue was discovered in Squid before 4.12 and 5.x before 5.0.3. Due to use of a potentially dangerous function, Squid and the default certificate validation… |
CVE-2020-15049 | Critical | 9.9 | 2020-06-30 | An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed aga… |
CVE-2020-11945 | Critical | 9.8 | 2020-04-23 | An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwis… |
CVE-2019-12520 | High | 7.5 | 2020-04-15 | An issue was discovered in Squid through 4.7 and 5. When receiving a request, Squid checks its cache to see if it can serve up a response. It does this by maki… |
CVE-2019-12519 | Critical | 9.8 | 2020-04-15 | An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fix… |
CVE-2019-12524 | Critical | 9.8 | 2020-04-15 | An issue was discovered in Squid through 4.7. When handling requests from users, Squid checks its rules to see if the request should be denied. Squid by defaul… |
CVE-2019-12522 | Medium | 4.5 | 2020-04-15 | An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child processes as a lesser user, by default the user nobody. This is do… |
CVE-2019-12521 | Medium | 5.9 | 2020-04-15 | An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a st… |
CVE-2019-18860 | Medium | 6.1 | 2020-03-20 | Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter to cachemgr.cgi. |
CVE-2019-12528 | High | 7.5 | 2020-02-04 | An issue was discovered in Squid before 4.10. It allows a crafted FTP server to trigger disclosure of sensitive information from heap memory, such as informati… |
CVE-2020-8517 | High | 7.5 | 2020-02-04 | An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to me… |
CVE-2020-8450 | High | 7.3 | 2020-02-04 | An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a r… |
CVE-2020-8449 | High | 7.5 | 2020-02-04 | An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server res… |
CVE-2019-18679 | High | 7.5 | 2019-11-26 | An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HT… |
CVE-2019-18678 | Medium | 5.3 | 2019-11-26 | An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that split… |
CVE-2019-18677 | Medium | 6.1 | 2019-11-26 | An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with… |
CVE-2019-18676 | High | 7.5 | 2019-11-26 | An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of… |
CVE-2019-12526 | Critical | 9.8 | 2019-11-26 | An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server… |
CVE-2019-12523 | Critical | 9.1 | 2019-11-26 | An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through the access… |
CVE-2019-12854 | High | 7.5 | 2019-08-15 | Due to incorrect string termination, Squid cachemgr.cgi 4.0 through 4.7 may access unallocated memory. On systems with memory access protections, this can caus… |
CVE-2019-12529 | Medium | 5.9 | 2019-07-11 | An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Pr… |
CVE-2019-12527 | High | 8.8 | 2019-07-11 | An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the decod… |
CVE-2019-12525 | Critical | 9.8 | 2019-07-11 | An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Au… |
CVE-2019-13345 | Medium | 6.1 | 2019-07-05 | The cachemgr.cgi web module of Squid through 4.7 has XSS via the user_name or auth parameter. |
CVE-2018-19132 | Medium | 5.9 | 2018-11-09 | Squid before 4.4, when SNMP is enabled, allows a denial of service (Memory Leak) via an SNMP packet. |
CVE-2018-19131 | Medium | 6.1 | 2018-11-09 | Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors. |
CVE-2018-1172 | Medium | 5.9 | 2018-05-16 | This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318. Authentication i… |
CVE-2018-1000027 | High | 7.5 | 2018-02-09 | The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-For… |
CVE-2018-1000024 | High | 7.5 | 2018-02-09 | The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response… |
CVE-2016-10003 | High | 7.5 | 2017-01-27 | Incorrect HTTP Request header comparison in Squid HTTP Proxy 3.5.0.1 through 3.5.22, and 4.0.1 through 4.0.16 results in Collapsed Forwarding feature mistakenl… |
CVE-2016-10002 | High | 7.5 | 2017-01-27 | Incorrect processing of responses to If-None-Modified HTTP conditional requests in Squid HTTP Proxy 3.1.10 through 3.1.23, 3.2.0.3 through 3.5.22, and 4.0.1 th… |
CVE-2016-4556 | High | 7.5 | 2016-05-10 | Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted E… |
CVE-2016-4555 | High | 7.5 | 2016-05-10 | client_side_request.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via crafted Edge Side Includ… |
CVE-2016-4554 | High | 8.6 | 2016-05-10 | mime_header.cc in Squid before 3.5.18 allows remote attackers to bypass intended same-origin restrictions and possibly conduct cache-poisoning attacks via a cr… |
CVE-2016-4553 | High | 8.6 | 2016-05-10 | client_side.cc in Squid before 3.5.18 and 4.x before 4.0.10 does not properly ignore the Host header when absolute-URI is provided, which allows remote attacke… |
CVE-2016-4054 | High | 8.1 | 2016-04-25 | Buffer overflow in Squid 3.x before 3.5.17 and 4.x before 4.0.9 allows remote attackers to execute arbitrary code via crafted Edge Side Includes (ESI) response… |
CVE-2016-4053 | Low | 3.7 | 2016-04-25 | Squid 3.x before 3.5.17 and 4.x before 4.0.9 allow remote attackers to obtain sensitive stack layout information via crafted Edge Side Includes (ESI) responses… |
CVE-2016-4052 | High | 8.1 | 2016-04-25 | Multiple stack-based buffer overflows in Squid 3.x before 3.5.17 and 4.x before 4.0.9 allow remote HTTP servers to cause a denial of service or execute arbitra… |
CVE-2016-4051 | High | 8.8 | 2016-04-25 | Buffer overflow in cachemgr.cgi in Squid 2.x, 3.x before 3.5.17, and 4.x before 4.0.9 might allow remote attackers to cause a denial of service or execute arbi… |
CVE-2016-2390 | Medium | 5.9 | 2016-04-19 | The FwdState::connectedToPeer method in FwdState.cc in Squid before 3.5.14 and 4.0.x before 4.0.6 does not properly handle SSL handshake errors when built with… |
CVE-2016-3948 | High | 7.5 | 2016-04-07 | Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP… |
CVE-2016-3947 | High | 8.2 | 2016-04-07 | Heap-based buffer overflow in the Icmp6::Recv function in icmp/Icmp6.cc in the pinger utility in Squid before 3.5.16 and 4.x before 4.0.8 allows remote servers… |
CVE-2016-2572 | High | 7.5 | 2016-02-27 | http.cc in Squid 4.x before 4.0.7 relies on the HTTP status code after a response-parsing failure, which allows remote HTTP servers to cause a denial of servic… |
CVE-2016-2571 | High | 7.5 | 2016-02-27 | http.cc in Squid 3.x before 3.5.15 and 4.x before 4.0.7 proceeds with the storage of certain data after a response-parsing failure, which allows remote HTTP se… |
CVE-2016-2570 | High | 7.5 | 2016-02-27 | The Edge Side Includes (ESI) parser in Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not check buffer limits during XML parsing, which allows remote HTTP s… |
CVE-2016-2569 | High | 7.5 | 2016-02-27 | Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not properly append data to String objects, which allows remote servers to cause a denial of service (asserti… |
CVE-2014-9749 | | | 2015-11-06 | Squid 3.4.4 through 3.4.11 and 3.5.0.1 through 3.5.1, when Digest authentication is used, allow remote authenticated users to retain access by leveraging a sta… |
CVE-2015-5400 | | | 2015-09-28 | Squid before 3.5.6 does not properly handle CONNECT method peer responses when configured with cache_peer, which allows remote attackers to bypass intended res… |
CVE-2015-3455 | | | 2015-05-18 | Squid 3.2.x before 3.2.14, 3.3.x before 3.3.14, 3.4.x before 3.4.13, and 3.5.x before 3.5.4, when configured with client-first SSL-bump, do not properly valida… |
CVE-2015-0881 | | | 2015-02-20 | CRLF injection vulnerability in Squid before 3.1.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a c… |
CVE-2014-7142 | | | 2014-11-26 | The pinger in Squid 3.x before 3.4.8 allows remote attackers to obtain sensitive information or cause a denial of service (crash) via a crafted (1) ICMP or (2)… |
CVE-2014-7141 | | | 2014-11-26 | The pinger in Squid 3.x before 3.4.8 allows remote attackers to obtain sensitive information or cause a denial of service (out-of-bounds read and crash) via a… |
CVE-2014-6270 | | | 2014-09-12 | Off-by-one error in the snmpHandleUdp function in snmp_core.cc in Squid 2.x and 3.x, when an SNMP port is configured, allows remote attackers to cause a denial… |
CVE-2014-3609 | | | 2014-09-11 | HttpHdrRange.cc in Squid 3.x before 3.3.12 and 3.4.x before 3.4.6 allows remote attackers to cause a denial of service (crash) via a request with crafted "Rang… |
CVE-2014-0128 | | | 2014-04-14 | Squid 3.1 before 3.3.12 and 3.4 before 3.4.4, when SSL-Bump is enabled, allows remote attackers to cause a denial of service (assertion failure) via a crafted… |
CVE-2013-1839 | | | 2013-09-30 | The strHdrAcptLangGetItem function in errorpage.cc in Squid 3.2.x before 3.2.9 and 3.3.x before 3.3.3 allows remote attackers to cause a denial of service (inf… |
CVE-2013-4123 | | | 2013-09-16 | client_side_request.cc in Squid 3.2.x before 3.2.13 and 3.3.x before 3.3.8 allows remote attackers to cause a denial of service via a crafted port number in a… |
CVE-2013-4115 | | | 2013-08-09 | Buffer overflow in the idnsALookup function in dns_internal.cc in Squid 3.2 through 3.2.11 and 3.3 through 3.3.6 allows remote attackers to cause a denial of s… |
CVE-2013-0189 | | | 2013-02-08 | cachemgr.cgi in Squid 3.1.x and 3.2.x, possibly 3.1.22, 3.2.4, and other versions, allows remote attackers to cause a denial of service (resource consumption)… |
CVE-2012-5643 | | | 2012-12-20 | Multiple memory leaks in tools/cachemgr.cc in cachemgr.cgi in Squid 2.x and 3.x before 3.1.22, 3.2.x before 3.2.4, and 3.3.x before 3.3.0.2 allow remote attack… |