CVE-2026-50012

Summary

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.

Affected Software

VendorProductVersion RangeStatus
squid-cachesquid< 7.6affected

Weaknesses

  • CWE-20: CWE-20: Improper Input Validation
  • CWE-122: CWE-122: Heap-based Buffer Overflow

References