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CVE-2019-25677 Win-Rar CVE debrief

CVE-2019-25677 is a denial of service vulnerability in WinRAR 5.61. Local attackers can crash the application by placing a malformed winrar.lng language file in the installation directory. The application will crash when an archive is opened and the test button is pressed, causing an access violation at memory address 004F1DB8 when the application attempts to read invalid data. This vulnerability has a CVSS score of 6.9 and a severity of MEDIUM. Users of WinRAR 5.61 should be aware of this vulnerability and take steps to mitigate it.

Vendor
Win-Rar
Product
WinRAR
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-05
Original CVE updated
2026-07-24
Advisory published
2026-04-05
Advisory updated
2026-07-24

Who should care

Users of WinRAR 5.61, security teams, and system administrators should be aware of this vulnerability and take steps to mitigate it. This may involve updating to a newer version of WinRAR or taking other compensating controls to prevent local attackers from exploiting this vulnerability.

Technical summary

The vulnerability is caused by the application's failure to properly validate the winrar.lng language file. When a malformed language file is placed in the installation directory, the application will crash when an archive is opened and the test button is pressed. This is due to an access violation at memory address 004F1DB8 when the application attempts to read invalid data. The vulnerability affects WinRAR 5.61 and may allow local attackers to crash the application.

Defensive priority

Medium

Recommended defensive actions

  • Update to a newer version of WinRAR if available
  • Verify the integrity of the winrar.lng language file
  • Restrict access to the installation directory
  • Monitor for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-04-05T21:16:45.800Z and has not been modified since then. The NVD entry is currently Analyzed. This information is based on the CVE.org and NVD sources. The vulnerability affects WinRAR 5.61 and may allow local attackers to crash the application. Evidence of exploitation is not publicly available, but defenders should verify the integrity of the winrar.lng language file and monitor for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-25677 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-25677

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2019-25677 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-25677

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.