CVE-2026-14191: WinRAR / UnRAR RAR5 recovery-volume (.rev) out-of-bounds heap write in RecVolumes5::ReadHeader

highpublic exploitCVSS 7.8CVE-2026-14191

CSIRTS triage

vendor: WinRAR product: UnRAR Memory corruption

What: There is an out-of-bounds heap write in the RAR5 recovery-volume handling.
Who is affected: Deployments of WinRAR using UnRAR are affected.
Urgency: Remediation is urgent due to the high severity and potential for exploitation.
Action: Update to the latest version of WinRAR.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-14191

Exploitation outlook

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-2026-141910.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-14191	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for WinRAR / UnRAR

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-14191: An out-of-bounds heap write exists in the RAR5 recovery-volume (.rev) parser in WinRAR and UnR…nvd · 2026-07-01