{"id":"CVE-2026-93748","title":"http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users","summary":"http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-524"],"vendor":"kornelski","product":"http-cache-semantics","affected":["http-cache-semantics <= 4.2.0"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:17:33.510","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93748","references":[{"url":"https://github.com/kornelski/http-cache-semantics","label":"disclosure@vulncheck.com"},{"url":"https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L425-L441","label":"disclosure@vulncheck.com"},{"url":"https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L603-L623","label":"disclosure@vulncheck.com"},{"url":"https://github.com/kornelski/http-cache-semantics/issues/56","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-user-cache-disclosure-via-max-stale","label":"disclosure@vulncheck.com"},{"url":"https://github.com/kornelski/http-cache-semantics/issues/56","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-18T20:05:06.835112Z"},"ingestedAt":"2026-09-18T18:47:53.268Z","epss":0.004,"epssPercentile":0.33938,"slug":"CVE-2026-93748","body":"## Overview\n\nhttp-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":207506,"id":"CVE-2026-93748","ts":1789764763674,"field":"exploit_available","old":"false","new":"true"}]}