[NEW] [UNPATCHED] [medium] Red Hat Undertow: Vulnerability enables file manipulation

A remote, anonymous attacker can exploit a vulnerability in Red Hat Undertow to manipulate files.

CSIRTS triage

What: A vulnerability in Red Hat Undertow enables remote file manipulation by an unauthenticated attacker.
Who is affected: Red Hat Undertow deployments accessible over the network are affected.
Urgency: Medium severity and unpatched status require timely remediation to prevent file manipulation attacks.
Action: Apply security patches for CVE-2026-19879 or restrict network access to Undertow instances.

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

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EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-198790.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all EPSS-scored CVEs.

CVE	CSIRTS overview	External
CVE-2026-19879	coverage & exploitation status	NVD · CVE.org

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