CVE-2026-84933 Affecting prism package, versions <5.16.0-r14


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.3% (21st percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-PRISM-20538574
  • published6 Oct 2026
  • disclosed4 Sept 2026

Introduced: 4 Sep 2026

CVE-2026-84933  (opens in a new tab)

How to fix?

Upgrade Chainguard prism to version 5.16.0-r14 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream prism package and not the prism package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

undici's cache interceptor does not handle the Set-Cookie response header anywhere in its cache path, so it neither refuses to store nor strips that header. In shared cache mode, which is the default, an otherwise cacheable response that carries a Set-Cookie header, for example one marked with a public and max-age directive, is stored and then re-served to a later caller that matches the same cache key. As a result one caller's cookie is disclosed to a different caller, and an untrusted server can inject cookies into cached responses served to all subsequent callers. This violates the requirement that a shared cache must not store cookies. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.

CVSS Base Scores

version 3.1