Detections
Analytics
CVE-2026-50012
medium
Description
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.
References
https://thehackernews.com/2026/06/29-year-old-squid-proxy-bug-squidbleed.html
https://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284
https://github.com/squid-cache/squid/releases/tag/SQUID_7_6
https://github.com/squid-cache/squid/pull/2423
https://github.com/squid-cache/squid/commit/19fcfe922717c8b255270c032dcde4071c003bcd