What is CVE-2025-59362?

CVE-2025-59362 is a medium-severity vulnerability in Squid-Cache Squid, classified under Stack-based Buffer Overflow. CVSS score: 4.0/10. Published 2025-09-26.

How severe is CVE-2025-59362?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Is CVE-2025-59362 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Squid-Cache Squid

CVE-2025-59362

Squid through 7.1 mishandles ASN.1 encoding of long SNMP OIDs. This occurs in asn_build_objid in lib/snmplib/asn1.c.

Vulnerability class: Buffer Overflow

Published 2025-09-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (32.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Squid-Cache Squid

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

Public proof-of-concept exploits

References

github.com/squid-cache/squid/pull/2149 (Patch, Issue Tracking)
github.com/Microsvuln/advisories/blob/main/CVE-2025-59362/CVE-2025-59362.md (Exploit)

Frequently asked questions

What is CVE-2025-59362?: CVE-2025-59362 is a medium-severity vulnerability in Squid-Cache Squid, classified under Stack-based Buffer Overflow. CVSS score: 4.0/10. Published 2025-09-26.
How severe is CVE-2025-59362?: Medium severity. CVSS v3 base score is 4.0 out of 10.
Is CVE-2025-59362 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.