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Fencer Vulns
low 2.9

CVE-2026-16517 json

Libarchive: libarchive: signed integer overflow in archive_write_zip_header

published 2026-07-21 3 mo ago modified 2026-11-06 2 d ago also EUVD-2026-47586

cvss
2.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.7.7-11.el10_2
  • Red Hat Red Hat Hardened Images 3.8.8-3.1.hum1
  • libarchive Debian 12 3.6.2-1+deb12u5
  • libarchive Debian 14 3.8.9-1

debian advisories DEBIAN-CVE-2026-16517

  • libarchive Ubuntu 22.04 LTS 3.6.0-1ubuntu1.9
  • libarchive Ubuntu 24.04 LTS 3.7.2-2ubuntu0.9
  • libarchive Ubuntu 26.04 LTS 3.8.5-1ubuntu2.3

ubuntu advisories UBUNTU-CVE-2026-16517

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 10.2 3.7.7-11.el10_2
  • bsdtar RHEL 10.2 3.7.7-11.el10_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-2026:69553RHSA-2026:43818

  • libarchive AlmaLinux 10 3.7.7-11.el10_2
  • bsdtar AlmaLinux 10 3.7.7-11.el10_2

almalinux advisories ALSA-2026:69553

  • libarchive Rocky Linux 10 3.7.7-11.el10_2

rocky linux advisories RLSA-2026:69553

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-2026-16517 updated cvss 2.9

libarchive: libarchive: Signed Integer Overflow in archive_write_zip_header

  • Red Hat Enterprise Linux 6 libarchive Red Hat Enterprise Linux 7 bsdtar, bsdcpio, libarchive Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 10) bsdtar 3.7.7-11.el10_2 Red Hat Enterprise Linux BaseOS (v. 10) libarchive 3.7.7-11.el10_2
    fixed: vendor fix RHSA-2026:69553
  • 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 Enterprise Linux 8 bsdtar, libarchive Red Hat Enterprise Linux 9 bsdtar, 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.