Origin Validation Error Affecting http-cache-semantics package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-HTTPCACHESEMANTICS-19964064
- published20 Sept 2026
- disclosed18 Sept 2026
- creditWayde Shi
Introduced: 18 Sep 2026
NewCVE-2026-93750 (opens in a new tab)How to fix?
There is no fixed version for http-cache-semantics.
Overview
Affected versions of this package are vulnerable to Origin Validation Error via the _varyMatches() function, which fails to properly handle Vary: * (wildcard) headers due to byte-for-byte string comparison. An attacker can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients. The Vary: * directive signals that a response is uncacheable for any other request, but the flawed comparison allows the wildcard to be bypassed, enabling cross-client cache disclosure.