CVE-2026-14191

Heap corruption via unchecked recovery-volume array index

Published Jul 1, 2026 · Updated Jul 1, 2026

Out-of-bounds write in WinRAR and RAR before 7.23 and UnRAR 7.21 and earlier allows attackers to corrupt heap memory via crafted .rev sets. RecVolumes5::ReadHeader sizes RecItems for the first volume but uses later files' RecNum values without checking the allocated vector before writing RevCRC. Triggering requires victim-initiated testing, repair, or automatic recovery of a supplied multi-volume set; a crash is demonstrated, but code execution is not.

CVSS severity7.8
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in WinRAR and RAR before 7.23 and UnRAR 7.21 and earlier allows attackers to corrupt heap memory via crafted .rev sets. RecVolumes5::ReadHeader sizes RecItems for the first volume but uses later files' RecNum values without checking the allocated vector before writing RevCRC. Triggering requires victim-initiated testing, repair, or automatic recovery of a supplied multi-volume set; a crash is demonstrated, but code execution is not.

The record

CVE
CVE-2026-14191
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
RARLAB
Product
UnRAR
Classifications
CWE-787, CWE-129, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=7.21

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

RARLAB · UnRARversion=0 <=7.21
RARLAB · WinRARversion=0 <7.23
RARLAB · UnRAR.dllversion=0 <7.23
RARLAB · RARversion=0 <7.23

Published CVSS scores

7.8SecurinCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-129Improper Validation of Array Index
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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