CVE-2026-93748
http-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-stale
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-524 |
| Vendor | kornelski |
| Product | http-cache-semantics |
| Published | Sep 18, 2026 |
| Last Updated | Sep 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
kornelski / http-cache-semantics
0 ≤ 4.2.0
References
github.com: https://github.com/kornelski/http-cache-semantics/issues/56 github.com: https://github.com/kornelski/http-cache-semantics github.com: https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L425-L441 github.com: https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L603-L623 vulncheck.com: https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-user-cache-disclosure-via-max-stale
Credits
🔍 Wayde Shi (PayPal Cyber Security Team)