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PatchSiren cyber security CVE debrief

CVE-2025-53816 7 Zip CVE debrief

CVE-2025-53816 is a memory-corruption flaw in 7-Zip's RAR5 handler. According to the CVE record, versions prior to 25.0.0 can write zeroes outside a heap buffer, which may result in denial of service and other memory-corruption effects. Version 25.0.0 is identified as the fix.

Vendor
7 Zip
Product
Unknown
CVSS
MEDIUM 5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-30
Original CVE updated
2026-06-30
Advisory published
2026-06-30
Advisory updated
2026-06-30

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-53816 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-53816

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

  • CVE-2025-53816 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-53816

    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.