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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-56003

39
FAUCET Score

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

First published: Jul 8, 2026Last modified: Jul 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, < 2.0.8CPE matchmatch criteria
cpe:2.3:a:x:libxfont:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.5HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
30.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 18th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

microsoftpatch availablevia msrc
Product: azl3 libXfont2 2.0.6-1 on Azure Linux 3.0Fixed in: 2.0.8-1
microsoftpatch availablevia msrc
Product: 21567-17084Fixed in: 2.0.8-1
ubuntupatch availablevia ubuntu_usn
Product: libxfont (jammy)Fixed in: 1:2.0.5-1ubuntu0.2
ubuntupatch availablevia ubuntu_usn
Product: libxfont (noble)Fixed in: 1:2.0.6-1+deb13u1build0.24.04.2
ubuntupatch availablevia ubuntu_usn
Product: libxfont (bionic)Fixed in: 1:2.0.3-1ubuntu0.1~esm2
ubuntupatch availablevia ubuntu_usn
Product: libxfont (trusty)Fixed in: 1:1.4.7-1ubuntu0.4+esm2
ubuntupatch availablevia ubuntu_usn
Product: libxfont (xenial)Fixed in: 1:1.5.1-1ubuntu0.16.04.4+esm2
ubuntupatch availablevia ubuntu_usn
Product: libxfont (resolute)Fixed in: 1:2.0.6-2ubuntu0.2
ubuntupatch availablevia ubuntu_usn
Product: libxfont (focal)Fixed in: 1:2.0.3-1ubuntu0.20.04.1~esm2

Vendor Advisories (2)

ubuntuUSN-8560-1

libXfont vulnerabilities

Jul 20, 2026
microsoft2026-Jul/CVE-2026-56003Important

libXfont2 computeProps Property Buffer Heap Buffer Overflow

Jul 2, 2026

References

gitlab.freedesktop.org / xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939
Patch
openwall.com / lists/oss-security/2026/07/08/1
Mailing ListPatchThird Party Advisory