CVE-2026-93748CWE-524

CVE-2026-93748

High · published September 18, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
46.4
In the wild
Unconfirmed
What it is

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 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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00569 · 46.4th percentile
Weakness
CWE-524 · Use of Cache Containing Sensitive Information
Published
2026-09-18T22:18Z
References (6)
https://github.com/kornelski/http-cache-semantics · [email protected]https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L425-L441 · [email protected]https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L603-L623 · [email protected]https://github.com/kornelski/http-cache-semantics/issues/56 · [email protected]https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-user-cache-disclosure-via-max-stale · [email protected]https://github.com/kornelski/http-cache-semantics/issues/56#issuecomment-5975759591 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 20 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 18 SEP 17:51Z
    http-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-stale
    cvelistv5