CVE-2026-50012

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.

• CWE-20
• CWE-122

• 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

Published

Jul 16, 2026

Last Modified

Jul 20, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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