Medium 5.5Published Jul 16, 2026

CVE-2026-50012Squid is a caching proxy for the Web.

Updated under an hour ago (2026-10-19 09:50 UTC)

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It affects squid-cache squid. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
Weakness (CWE): CWE-20, CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

squid-cache squid squid-cache:squid	before 7.6	NVD

References

https://github.com/squid-cache/squid/commit/19fcfe922717c8b255270c032dcde4071c003bcdpatch
https://github.com/squid-cache/squid/pull/2423patch
https://github.com/squid-cache/squid/releases/tag/SQUID_7_6release-notes
https://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.