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Fencer Intel
medium 5.5

CVE-2015-8934 json

The copy_from_lzss_window function in archive_read_support_format_rar.c in libarchive 3.2.0 and earlier allows remote attackers to cause a…

published 2016-09-20 10 y ago modified 2026-06-17 4 mo ago also EUVD-2015-8790

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

The copy_from_lzss_window function in archive_read_support_format_rar.c in libarchive 3.2.0 and earlier allows remote attackers to cause a denial of service (out-of-bounds heap read) via a crafted rar file.

Patch / fix

  • libarchive Debian 14, Debian 13, Debian 12 3.2.1-1

debian advisories DEBIAN-CVE-2015-8934

  • libarchive Ubuntu 14.04 LTS 3.1.2-7ubuntu2.3
  • libarchive Ubuntu 16.04 LTS 3.1.2-11ubuntu0.16.04.2

ubuntu advisories UBUNTU-CVE-2015-8934

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libarchive RHEL 7 3.1.2-10.el7_2
  • bsdtar RHEL 7 3.1.2-10.el7_2
  • bsdcpio RHEL 7 3.1.2-10.el7_2

red hat advisories RHSA-2016:1844

  • libarchive SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 3.1.2-22.1

suse advisories SUSE-SU-2016:1909-1

  • bsdtar openSUSE Tumbleweed 3.2.2-2.1

opensuse advisories openSUSE-SU-2024:10127-1

  • libarchive Alpine 3.4 3.2.1-r0

alpine advisories ALPINE-CVE-2015-8934

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-8934 updated cvss 3.7

libarchive: out of bounds heap read in RAR parser

  • Red Hat Enterprise Linux Client (v. 7) libarchive 3.1.2-10.el7_2 Red Hat Enterprise Linux Client Optional (v. 7) bsdtar 3.1.2-10.el7_2, bsdcpio 3.1.2-10.el7_2 Red Hat Enterprise Linux ComputeNode (v. 7) libarchive 3.1.2-10.el7_2 Red Hat Enterprise Linux ComputeNode Optional (v. 7) bsdtar 3.1.2-10.el7_2, bsdcpio 3.1.2-10.el7_2 Red Hat Enterprise Linux Server (v. 7) libarchive 3.1.2-10.el7_2 Red Hat Enterprise Linux Server Optional (v. 7) bsdtar 3.1.2-10.el7_2, bsdcpio 3.1.2-10.el7_2
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) libarchive 3.1.2-10.el7_2 Red Hat Enterprise Linux Workstation Optional (v. 7) bsdtar 3.1.2-10.el7_2, bsdcpio 3.1.2-10.el7_2
    fixed: vendor fix RHSA-2016:1844
  • Red Hat Enterprise Linux 6 libarchive
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.32% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/libarchive/libarchive/issues/521 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.