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Fencer Vulns
high 7.5

CVE-2023-26767 json

Buffer Overflow vulnerability found in Liblouis v.3.24.0 allows a remote attacker to cause a denial of service via the lou_logFile function…

published 2023-03-16 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-30560

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

Buffer Overflow vulnerability found in Liblouis v.3.24.0 allows a remote attacker to cause a denial of service via the lou_logFile function at logginc.c endpoint.

Patch / fix

  • liblouis Debian 14, Debian 13 3.24.0-2

debian advisories DEBIAN-CVE-2023-26767

  • liblouis Ubuntu 18.04 LTS 3.5.0-1ubuntu0.5
  • liblouis Ubuntu 20.04 LTS 3.12.0-3ubuntu0.2
  • liblouis Ubuntu 22.04 LTS 3.20.0-2ubuntu0.2
  • liblouis Ubuntu Pro 16.04 LTS 2.6.4-2ubuntu0.4+esm1

ubuntu advisories UBUNTU-CVE-2023-26767

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

  • liblouis RHEL 9 3.16.1-5.el9
  • python3-louis RHEL 9 3.16.1-5.el9

red hat advisories RHSA-2023:6385

  • liblouis SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 2.6.4-6.14.2
  • python-louis SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 2.6.4-6.14.3
  • python3-louis SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 2.6.4-6.16.1
  • liblouis SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +8 more 3.11.0-150200.3.8.1
  • liblouis SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS +1 more 3.3.0-150000.4.13.1
  • liblouis SLE Module for Desktop Applications 15 SP4, openSUSE Leap 15.4 3.20.0-150400.3.8.1

suse advisories SUSE-SU-2023:1824-1SUSE-SU-2023:1773-1SUSE-SU-2023:1772-1SUSE-SU-2023:1771-1

  • liblouis openSUSE Tumbleweed 3.25.0-1.1

opensuse advisories openSUSE-SU-2024:12815-1

  • liblouis AlmaLinux 9 3.16.1-5.el9
  • python3-louis AlmaLinux 9 3.16.1-5.el9

almalinux advisories ALSA-2023:6385

  • liblouis Rocky Linux 9 3.16.1-5.el9

rocky linux advisories RLSA-2023:6385

  • liblouis CBL-Mariner 2.0 3.26.0-1

azure linux advisories AZL-25654

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-2023-26767 updated cvss 7.5

liblouis: buffer overflow in lou_logFile function at logginc.c

  • Red Hat Enterprise Linux 7 liblouis, liblouis-utils, liblouis-python
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 liblouis, python3-louis
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 9) liblouis 3.16.1-5.el9, python3-louis 3.16.1-5.el9
    fixed: vendor fix RHSA-2023:6385

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
yes
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/liblouis/liblouis/issues/1292 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.