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Fencer Vulns
low 2.5

CVE-2025-64031 json

libarchive 3.8.x before 3.8.2 has a strcpy heap-based buffer overflow in the gzip writer via the original-filename field to archive_compres…

published 2026-09-14 56 d ago modified 2026-10-14 25 d ago also EUVD-2025-210902

cvss
2.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

libarchive 3.8.x before 3.8.2 has a strcpy heap-based buffer overflow in the gzip writer via the original-filename field to archive_compressor_gzip_open in archive_write_add_filter_gzip.c, aka GHSA-92wx-p669-8gr9. This relates to bsdtar. Exploitation envisions a marginally plausible scenario in which original-filename is obtained from an untrusted party. (original-filename is not derived from the input data.)

Patch / fix

  • libarchive libarchive 3.8.2
  • bsdcat hummingbird 1 3.8.8-3.1.hum1
  • bsdtar hummingbird 1 3.8.8-3.1.hum1
  • bsdcpio hummingbird 1 3.8.8-3.1.hum1
  • bsdunzip hummingbird 1 3.8.8-3.1.hum1
  • libarchive hummingbird 1 3.8.8-3.1.hum1

red hat advisories RHSA-2026:43818

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-2025-64031 updated cvss 4.7

libarchive: libarchive: Denial of Service via heap-based buffer overflow in gzip writer

  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images bsdcat 3.8.8-3.1.hum1, bsdtar 3.8.8-3.1.hum1, bsdcpio 3.8.8-3.1.hum1, bsdunzip 3.8.8-3.1.hum1, libarchive 3.8.8-3.1.hum1
    fixed: vendor fix RHSA-2026:43818

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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
53 d ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gist.github.com https://gist.github.com/ttuurrnn/1365a4a9b1c3d5826a3a9bbe111f26b8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 2.5 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected products

  • libarchive libarchive

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns 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.