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Fencer Vulns
medium 5.5

CVE-2023-26966 json

libtiff 4.5.0 is vulnerable to Buffer Overflow in uv_encode() when libtiff reads a corrupted little-endian TIFF file and specifies the outp…

published 2023-06-29 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-30756

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

libtiff 4.5.0 is vulnerable to Buffer Overflow in uv_encode() when libtiff reads a corrupted little-endian TIFF file and specifies the output to be big-endian.

Patch / fix

  • tiff Debian 12 4.5.0-6+deb12u2
  • tiff Debian 14, Debian 13 4.5.1~rc3-1

debian advisories DEBIAN-CVE-2023-26966

  • tiff Ubuntu 20.04 LTS 4.1.0+git191117-2ubuntu0.20.04.9
  • tiff Ubuntu 22.04 LTS 4.3.0-6ubuntu0.5
  • tiff Ubuntu Pro 14.04 LTS 4.0.3-7ubuntu0.11+esm8
  • tiff Ubuntu Pro 16.04 LTS 4.0.6-1ubuntu0.8+esm11
  • tiff Ubuntu Pro 18.04 LTS 4.0.9-5ubuntu0.10+esm1

ubuntu advisories UBUNTU-CVE-2023-26966

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

  • libtiff RHEL 9 4.4.0-10.el9
  • libtiff-tools RHEL 9 4.4.0-10.el9

red hat advisories RHSA-2023:6575

  • tiff SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.0.9-44.71.1
  • tiff SLE Module for Package Hub 15 SP5, SLE Module for Package Hub 15 SP4, SLE Module for Basesystem 15 SP5 +9 more 4.0.9-150000.45.32.1

suse advisories SUSE-SU-2023:4371-1SUSE-SU-2023:4370-1

  • libtiff AlmaLinux 9 4.4.0-10.el9
  • libtiff-tools AlmaLinux 9 4.4.0-10.el9

almalinux advisories ALSA-2023:6575

  • libtiff CBL-Mariner 2.0 4.5.1-1

azure linux advisories AZL-27303

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2023-26966 updated cvss 5.5

libtiff: Buffer Overflow in uv_encode()

  • Red Hat Enterprise Linux 6 libtiff Red Hat Enterprise Linux 7 libtiff, libtiff-tools, compat-libtiff3
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 libtiff, libtiff-tools, compat-libtiff3
    affected: no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 9) libtiff-tools 4.4.0-10.el9 Red Hat Enterprise Linux AppStream (v. 9) libtiff 4.4.0-10.el9
    fixed: vendor fix RHSA-2023:6575

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
23 mo ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.com https://gitlab.com/libtiff/libtiff/-/issues/530 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

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.