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Verdict

MEDIUM SEVERITY (CVSS 6.5)

What is this: 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 h… (CWE-200)
Should you care: Rated medium severity — CVSS 6.5.
What to do: Patch when able.

OBSERVEDMODERATE EVIDENCE COVERAGEDeterministic · stored evidence only

Vulnerability investigation

Prioritize by applicability, impact, and exploitation evidence

CISA KEV status could not be verified from the available evidence. NVD rates the technical severity medium at CVSS 6.5. These are public vulnerability signals, not proof that a specific environment runs an affected version.

Exploitation status

KEV status unavailable

The KEV source did not return a conclusive status.

30-day exploitation likelihood

Unavailable

FIRST EPSS did not return a score.

Technical severity

6.5 · medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected surface

Product applicability incomplete

No structured product mapping is available.

Weakness class

CWE-200, CWE-524

CWE describes the weakness category, not whether a deployed product is reachable or exploitable.

Corpus evidence

1 connectors · 2 citations

No related report text is available in the local corpus.

What the evidence supports

Findings stay bounded to named sources and observable infrastructure.

1 finding

CVSS 6.5 medium technical impact

HIGH

Network · High · None

NIST NVD CVSS

CVSS measures technical severity and prerequisites; it does not measure observed exploitation likelihood.

What remains unknown

Whether your environment runs an affected product and version is not established by this public lookup.
Reachability, compensating controls, and successful exploitation in a specific environment are not checked.
No reliable product/version mapping is available, so applicability remains unresolved.
CISA KEV status is unavailable and must be retried before drawing an exploitation conclusion.
No locally ingested public report supplies exploit, actor, or campaign context for this CVE.

What this is

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.

Evidence readiness

The base CVE appears first. Independent evidence is added without blocking the page.

Investigation status

Checking for newly completed evidence

Refreshing

NIST NVD

NVD evidence is available in this response

Ready

CISA KEV

Known-exploitation catalog check is pending

Pending

FIRST EPSS

Forensia does not request or publish EPSS while source rights are under review

Rights pending

Reports

Report links are still being resolved

Pending

Relationships

Product and vulnerability relationships are still being prepared

Pending

related indicators · 14 connectors · 1

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