Out-of-bounds Read in Squid-Cache Squid
CVE-2026-47729
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.cc), Squid is vulnerable to an out-of-bounds read: when a listing entry date in the TypeA or TypeB directory-listing formats is not followed by a filename, parsing was not restricted to the input buffer, so a trusted client accessing a misbehaving FTP server through Squid's gateway feature could read memory from random unrelated transactions. This issue is fixed in version 7.6.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (73.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Squid-Cache Squid — versions < 7.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/squid-cache/squid/security/advisories/GHSA-8c37-pxjq-qwrg (Vendor Advisory)
- github.com/squid-cache/squid/pull/2408 (Patch)
- github.com/squid-cache/squid/pull/2409 (Patch)
- github.com/squid-cache/squid/commit/865a131c7d557e68c965043d98c2eccae26deef8 (Patch)
- github.com/squid-cache/squid/releases/tag/SQUID_7_6 (Release Notes)
Frequently asked questions
- What is CVE-2026-47729?
- CVE-2026-47729 is a medium-severity vulnerability in Squid-Cache Squid, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-07-16.
- How severe is CVE-2026-47729?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2026-47729 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.