CVE-2026-13697 (GCVE-0-2026-13697)

Vulnerability from cvelistv5 – Published: 2026-07-29 16:32 – Updated: 2026-07-29 17:53
VLAI
Title
undici vulnerable to cross-user information disclosure and parse-time crash via degenerate private cache directives
Summary
undici's cache interceptor mishandles malformed Cache-Control private directives. In undici 7.0.0 up to before 7.29.0 and 8.0.0 up to before 8.9.0, a response carrying a degenerate qualified private directive, such as private set to an empty value, can be stored in the default shared cache and later served to a different caller with the same cache key, disclosing private response bodies and headers including Set-Cookie. Separately, a Cache-Control header that combines an unqualified private directive with a qualified one triggers an uncaught TypeError in the cache-control parser, which rejects the request and, depending on the consumer's error handling, can terminate the process. Both issues affect applications using the cache interceptor in shared mode, including the default configuration. The issues are fixed in undici 7.29.0 and 8.9.0.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-248 - Uncaught Exception
  • CWE-525 - Use of Web Browser Cache Containing Sensitive Information
Assigner
References
Impacted products
Vendor Product Version
undici undici Affected: 7.0.0 , < 7.29.0 (semver)
Unaffected: 7.29.0 (semver)
Affected: 8.0.0 , < 8.9.0 (semver)
Unaffected: 8.9.0 (semver)
Create a notification for this product.
Credits
mcollina UlisesGascon
Show details on NVD website
To clipboard 

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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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