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 previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.

Project Subscriptions

Vendors Products
Http-cache-semantics Project Subscribe
Http-cache-semantics Subscribe
Kornelski Subscribe
Http-cache-semantics Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 23 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-524
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 21 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Kornelski
Kornelski http-cache-semantics
Vendors & Products Kornelski
Kornelski http-cache-semantics

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Description 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 previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.
Title http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard
First Time appeared Http-cache-semantics Project
Http-cache-semantics Project http-cache-semantics
Weaknesses CWE-436
CPEs cpe:2.3:a:http-cache-semantics_project:http-cache-semantics:*:*:*:*:*:*:*:*
Vendors & Products Http-cache-semantics Project
Http-cache-semantics Project http-cache-semantics
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-18T18:03:20.270Z

Reserved: 2026-09-18T16:30:17.776Z

Link: CVE-2026-93750

cve-icon Vulnrichment

Updated: 2026-09-18T18:03:16.325Z

cve-icon NVD

Status : Received

Published: 2026-09-18T18:18:33.633

Modified: 2026-09-18T18:18:33.633

Link: CVE-2026-93750

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-18T17:51:35Z

Links: CVE-2026-93750 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T02:45:14Z

Weaknesses