CVE-2026-19879
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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Exploitation outlook
- Low exploitation risk0.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all EPSS-scored CVEs.
Advisory coverage (2)
- medium[NEW] [UNPATCHED] [medium] Red Hat Undertow: Vulnerability enables file manipulationcert-bund · 2026-08-17
- mediumCVE-2026-19879: A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. Th…nvd · 2026-08-14
External references
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