{"id":"CVE-2026-50012","title":"Squid is a caching proxy for the Web","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'…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H","cwe":["CWE-20","CWE-122"],"vendor":"squid-cache","product":"squid","affected":["squid < 7.6"],"patched":["squid 7.6"],"published":"2026-07-16","updated":"2026-07-20","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50012","references":[{"url":"https://github.com/squid-cache/squid/commit/19fcfe922717c8b255270c032dcde4071c003bcd","label":"security-advisories@github.com"},{"url":"https://github.com/squid-cache/squid/pull/2423","label":"security-advisories@github.com"},{"url":"https://github.com/squid-cache/squid/releases/tag/SQUID_7_6","label":"security-advisories@github.com"},{"url":"https://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.01364,"epssPercentile":0.70158,"ingestedAt":"2026-07-20T02:36:03.264Z","slug":"CVE-2026-50012","body":"## Overview\n\nSquid 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.\n\n## Affected\n\n- `squid < 7.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `squid 7.6`","depth":"sunlit","depthScore":31,"depthScoreParts":{"impact":30.3,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}