Security readout for executives and security teams
Plain-English summary
CVE-2026-14191 is a high-severity memory corruption flaw in WinRAR and related RAR tools when handling RAR5 recovery volumes. A user must process a malicious .rev recovery set. The bundle identifies WinRAR/RAR 7.23 as the fixed release and does not show active exploitation.
Executive priority
Prioritize patching where archive tools process files from users, customers, email, or the internet. Business urgency is high because the impact includes confidentiality, integrity, and availability, but current sources do not show active exploitation.
Technical view
The flaw is an out-of-bounds heap write in RecVolumes5::ReadHeader for RAR5 .rev files. RecItems is sized from the first recovery volume, while later volumes can provide a RecNum validated only against their own TotalCount. This can corrupt adjacent heap memory during recovery or testing operations.
Likely exposure
Most exposure is on endpoints, servers, or automation that use WinRAR, RAR, UnRAR, or UnRAR.dll to process untrusted RAR5 recovery volumes. The source bundle does not provide a reliable vulnerable version range beyond stating fixed in 7.23.
Exploitation context
Exploitation requires user interaction or workflow-triggered processing of attacker-supplied .rev recovery volumes. The source bundle lists KEV as false and provides no cited evidence of active exploitation in the wild.
Researcher notes
The issue is described as the RAR5-path sibling of CVE-2023-40477, which affected the RAR3 path. Version-range evidence in the bundle is incomplete, so treat vendor release notes and component provenance as decisive during triage.
Mitigation direction
- Upgrade WinRAR/RAR to 7.23 or later where deployed.
- Check RARLAB guidance for fixed UnRAR and UnRAR.dll builds.
- Avoid recovery or test operations on untrusted .rev files until patched.
- Block or quarantine unexpected .rev attachments and uploads.
- Update archive-processing pipelines that bundle UnRAR components.
Validation and detection
- Inventory WinRAR, RAR, UnRAR, and UnRAR.dll installations.
- Confirm deployed builds match the vendor-fixed 7.23 release or later.
- Identify workflows that process .rev recovery volumes automatically.
- Review email, web upload, and file-share controls for .rev handling.
- Document any systems relying on embedded UnRAR libraries.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-129: Exact CWE lookup
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Open ATT&CK lookupCWE-787: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-14191 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9securinVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelinesecurin
Vulnerability reported to RARLAB (Eugene Roshal) by Securin
- Source timelinesecurin
RARLAB confirmed the findings after independent source review
- Source timelinesecurin
CVE-2026-14191 reserved by Securin CNA
- Source timelinesecurin
WinRAR / RAR 7.23 released with .rev processing fix
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- WinRAR / RAR 7.23 download (fixed release, 2026-06-30)CVE reference, securin · patch, vendor-advisory
- CVE-2023-40477 - Sibling RAR3-path vulnerability fixed in WinRAR 6.23CVE reference, securin · related
- https://www.securin.io/zero-days/cve-2026-14191-winrar-unrar-rar5-recovery-volume-rev-out-of-bounds-heap-write-in-recvolumes5-readheaderCVE reference, securin
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.