CVE-2026-93748: Use of Cache Containing Sensitive Information in kornelski http-cache-semantics
A vulnerability in http-cache-semantics up to version 4.2.0 allows unauthenticated attackers to retrieve cached responses containing sensitive information. The flaw involves improper validation of security-zeroed cache entries when processing client max-stale directives. Attackers can exploit this by requesting the same URL with a large max-stale value to access another user's Set-Cookie session credentials from shared cache entries.
AI Analysis
Technical Summary
http-cache-semantics versions up to 4.2.0 do not properly validate cache entries that were zeroed for security purposes when handling client max-stale directives. This allows unauthenticated attackers to retrieve cached responses belonging to other users by requesting the same URL with a large max-stale value. The vulnerability exposes sensitive session credentials such as Set-Cookie headers from shared cache entries that should have been protected.
Potential Impact
An attacker can obtain sensitive session credentials (Set-Cookie headers) from other users without authentication by exploiting the cache validation flaw. This can lead to session hijacking or unauthorized access to user sessions. The vulnerability has a high severity with a CVSS 4.0 score of 8.7, indicating significant risk if exploited.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
CVE-2026-93748: Use of Cache Containing Sensitive Information in kornelski http-cache-semantics
Description
A vulnerability in http-cache-semantics up to version 4.2.0 allows unauthenticated attackers to retrieve cached responses containing sensitive information. The flaw involves improper validation of security-zeroed cache entries when processing client max-stale directives. Attackers can exploit this by requesting the same URL with a large max-stale value to access another user's Set-Cookie session credentials from shared cache entries.
CVSS v4.0
Score 8.7high
Affected software
kornelski
http-cache-semantics
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
http-cache-semantics versions up to 4.2.0 do not properly validate cache entries that were zeroed for security purposes when handling client max-stale directives. This allows unauthenticated attackers to retrieve cached responses belonging to other users by requesting the same URL with a large max-stale value. The vulnerability exposes sensitive session credentials such as Set-Cookie headers from shared cache entries that should have been protected.
Potential Impact
An attacker can obtain sensitive session credentials (Set-Cookie headers) from other users without authentication by exploiting the cache validation flaw. This can lead to session hijacking or unauthorized access to user sessions. The vulnerability has a high severity with a CVSS 4.0 score of 8.7, indicating significant risk if exploited.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-18T16:30:17.085Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aad7cac55bf5e2cf55a40b7
Added to database: 09/18/2026, 18:02:20 UTC
Last enriched: 09/18/2026, 18:16:43 UTC
Last updated: 09/18/2026, 18:21:32 UTC
Views: 6
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