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High severity7.4NVD Advisory· Published Jul 29, 2026· Updated Aug 4, 2026

CVE-2026-13697

CVE-2026-13697

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
undicinpm
>= 7.0.0, < 7.29.07.29.0
undicinpm
>= 8.0.0, < 8.9.08.9.0

Affected products

21

Patches

Vulnerability mechanics

References

7

News mentions

1