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CVE-2025-5915Libarchive: heap buffer over read in copy_from_lzss_window() at archive_read_support_format_rar.c

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.

Timeline

  1. ID reserved

    By redhat

  2. Published

  3. · 17 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-5915, by who scored it
Scored byCVSSScoreVector
redhatCNA (assigner)3.1Medium6.6CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H
NVDNVD · Modified3.1Medium6.6CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H
EPSS (exploitation in 30 days)
0.22% · top 87% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.6.

Affected products

What to do

Workaround: Upgrade to libarchive version 3.8.0 or later, which includes important security fixes and stability improvements.

References

References4

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .