Assessment
Why it matters
EPSS is 0.4%; technical severity is CVSS 6.9.
WinRAR 5.61 contains a denial of service vulnerability that allows local attackers to crash the application by placing a malformed winrar.lng language file in the installation directory. Attackers can trigger the crash by opening an archive and pressing the test button, causing an access violation at memory address 004F1DB8 when the application attempts to read invalid data.
Who should care
- Teams operating WinRAR
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether WinRAR is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Review vendor guidance and identify the supported fix or mitigation.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteNo explicit patch, upgrade, mitigation or workaround is currently recorded.
Technical details
- CVSS vector
- CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CWE
- CWE-379
- Affected versions
- RARLAB WinRAR (End Including 5.61)
- Fixed versions
- No explicit fixed version is currently recorded.
- Published
- 5 April 2026
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 0.4%
- Signal calculated at 11