{"id":"CVE-2026-93750","title":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison","summary":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previous…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-436","CWE-524"],"vendor":"kornelski","product":"http-cache-semantics","affected":["http-cache-semantics <= 4.2.0"],"published":"2026-09-18","updated":"2026-09-23","sourceUpdated":"2026-09-23T17:17:49.997","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93750","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#L483-L501","label":"disclosure@vulncheck.com"},{"url":"https://github.com/kornelski/http-cache-semantics/issues/57","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-client-cache-disclosure-via-vary-wildcard","label":"disclosure@vulncheck.com"},{"url":"https://github.com/kornelski/http-cache-semantics/issues/57","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93750.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-93750"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2538846"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93750"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93750"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00445,"epssPercentile":0.38501,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T18:03:06.336954Z"},"ingestedAt":"2026-09-18T18:47:53.269Z","slug":"CVE-2026-93750","body":"## Overview\n\nhttp-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Confidential Compute Attestation, Exploit Intelligence, Gatekeeper 3, Migration Toolkit for Applications 8, Migration Toolkit for Containers, Multicluster Engine for Kubernetes, … · no fix planned: Confidential Compute Attestation, Exploit Intelligence, Gatekeeper 3, Migration Toolkit for Applications 8, … · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93750.json)","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}