CVE-2026-11525

lowCVSS 3.7covered by 1 sourcefirst seen 2026-06-09

CSIRTS triage

What: The vulnerability allows for a downgrade of the Set-Cookie SameSite attribute via permissive substring matching.
Who is affected: Deployments using undici.
Urgency: Remediation is low urgency as the severity is low and exploitation is not currently active.
Action: Update to the latest version of undici.

AI-assisted analysis generated from the source advisory — verify against the original.

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Low exploitation risk0.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all EPSS-scored CVEs.

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