CVE-2025-53816 7 Zip CVE debrief

Who should care

Administrators and endpoint teams running 7-Zip on affected versions should care most, especially where users regularly open archives from external or untrusted sources. Security teams should also review downstream packages that may lag behind upstream 7-Zip 25.0.0.

Technical summary

The supplied CVE/NVD data describes an out-of-bounds write of zeroes in the RAR5 handler, classified as CWE-122 (heap-based buffer overflow). NVD lists affected 7-Zip versions as prior to 25.00 and provides a CVSS v4.0 vector of AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H, reflecting local attack conditions and high availability impact with no confidentiality or integrity impact recorded in the vector.

Defensive priority

Moderate. Prioritize remediation on systems that frequently process third-party archives or where 7-Zip is widely deployed, because the affected range is broad and the issue can cause memory corruption and service disruption.

Recommended defensive actions

• Upgrade 7-Zip to version 25.0.0 or later on all affected systems.
• Inventory endpoints and servers that still run 7-Zip versions earlier than 25.00.
• Treat untrusted RAR5 archives as higher risk until systems are patched.
• Verify whether your distribution or software repository has backported the fix if you rely on packaged builds.
• Re-test any archive-processing workflows after upgrading to confirm normal operation.

Evidence notes

This debrief is based only on the supplied CVE/NVD record and linked references. The CVE was published on 2025-07-17, and the NVD record was last modified on 2026-05-11. NVD lists a vulnerable 7-Zip CPE with an upper bound below 25.00, cites CWE-122, and includes references to a GitHub Security Lab advisory, an oss-security mailing-list post, and a Debian LTS notice.

Official resources