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NVD / CVE Program· CNA suse

CVE-2026-56003: libXfont2 computeProps Property Buffer Heap Buffer Overflow

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.40% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: X.Org libXfont2 2.0.8; azl3 libXfont2 2.0.6-1 on Azure Linux 3.0 2.0.8-1.

Low priority for now. Upgrade to X.Org libXfont2 2.0.8; azl3 libXfont2 2.0.6-1 on Azure Linux 3.0 2.0.8-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Jul 8, 2026
Updated
Oct 25, 2026
EPSS
0.4% · 34th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
8.8
CNA · suse
8.5
0.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-56003

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
xlibxfont

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • x libxfont2.0.0 and later · before 2.0.8

Versions reported by the vendor

Affected version ranges reported by the assigning authority (suse). Independent of NVD's CPE analysis and usually ahead of it.

  • X.Org libXfont2

    • before 2.0.8affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10libXfont2before 2.0.6-5.el10_2.12.0.6-5.el10_2.1
AlmaLinux:10libXfont2-develbefore 2.0.6-5.el10_2.12.0.6-5.el10_2.1
AlmaLinux:8libXfont2before 2.0.3-2.el8_10.12.0.3-2.el8_10.1
AlmaLinux:8libXfont2-develbefore 2.0.3-2.el8_10.12.0.3-2.el8_10.1
AlmaLinux:9libXfont2before 2.0.3-12.el9_8.12.0.3-12.el9_8.1
AlmaLinux:9libXfont2-develbefore 2.0.3-12.el9_8.12.0.3-12.el9_8.1
Debian:12libxfontbefore 1:2.0.6-1+deb12u11:2.0.6-1+deb12u1
Debian:13libxfontbefore 1:2.0.6-1+deb13u11:2.0.6-1+deb13u1
Debian:14libxfontbefore 1:2.0.8-11:2.0.8-1
openSUSE:Leap 16.0libXfont2before 2.0.7-160000.4.12.0.7-160000.4.1
openSUSE:TumbleweedlibXfont2before 2.0.7-2.12.0.7-2.1
Red Hat:enterprise_linux_eus:10.0libXfont2before 0:2.0.6-5.el10_0.10:2.0.6-5.el10_0.1
Red Hat:enterprise_linux_eus:10.0libXfont2-debuginfobefore 0:2.0.6-5.el10_0.10:2.0.6-5.el10_0.1
Red Hat:enterprise_linux_eus:10.0libXfont2-debugsourcebefore 0:2.0.6-5.el10_0.10:2.0.6-5.el10_0.1
Red Hat:enterprise_linux_eus:10.0libXfont2-develbefore 0:2.0.6-5.el10_0.10:2.0.6-5.el10_0.1
Red Hat:enterprise_linux:10.2libXfont2before 0:2.0.6-5.el10_2.10:2.0.6-5.el10_2.1
Red Hat:enterprise_linux:10.2libXfont2-debuginfobefore 0:2.0.6-5.el10_2.10:2.0.6-5.el10_2.1
Red Hat:enterprise_linux:10.2libXfont2-debugsourcebefore 0:2.0.6-5.el10_2.10:2.0.6-5.el10_2.1
Red Hat:enterprise_linux:10.2libXfont2-develbefore 0:2.0.6-5.el10_2.10:2.0.6-5.el10_2.1
Red Hat:enterprise_linux:8::appstreamlibXfont2before 0:2.0.3-2.el8_10.10:2.0.3-2.el8_10.1
Red Hat:enterprise_linux:8::appstreamlibXfont2-debuginfobefore 0:2.0.3-2.el8_10.10:2.0.3-2.el8_10.1
Red Hat:enterprise_linux:8::appstreamlibXfont2-debugsourcebefore 0:2.0.3-2.el8_10.10:2.0.3-2.el8_10.1
Red Hat:enterprise_linux:8::crblibXfont2-develbefore 0:2.0.3-2.el8_10.10:2.0.3-2.el8_10.1
Red Hat:enterprise_linux:9::appstreamlibXfont2before 0:2.0.3-12.el9_8.10:2.0.3-12.el9_8.1

+29

Same product

x: all records

Other highest-scoring records for the same primary product.

  • CVE-2007-5199A single byte overflow in catalogue.c in X.Org libXfont 1.3.1 allows remote attackers to have unspecified impact.
    40Plan
  • CVE-2013-6462Stack-based buffer overflow in the bdfReadCharacters function in bitmap/bdfread.c in X.Org libXfont 1.1 through 1.4.6 allows remote attacker
    40Plan
  • CVE-2011-2895The LZW decompressor in (1) the BufCompressedFill function in fontfile/decompress.c in X.Org libXfont before 1.4.4 and (2) compress/compress
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2017-16611Dec 1, 2017 · In libXfont before 1.5.4 and libXfont2 before 2.0.3, a local attacker can open (but not read) files on the system as root, triggering tape r
    22Monitor
  • ← EarlierCVE-2026-56001Jul 8, 2026 · libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow
    35Monitor
  • ← EarlierCVE-2026-56002Jul 8, 2026 · libXfont2 PCF Font Parsing Heap Buffer Overflow
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
X.Org libXfont22.0.8Vendor (CNA)
azl3 libXfont2 2.0.6-1 on Azure Linux 3.02.0.8-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:libXfont22.0.3-2.el8_10.1 · AlmaLinux:8Package registry (OSV)
almalinux:libXfont22.0.6-5.el10_2.1 · AlmaLinux:10Package registry (OSV)
almalinux:libXfont2-devel2.0.3-2.el8_10.1 · AlmaLinux:8Package registry (OSV)
almalinux:libXfont2-devel2.0.6-5.el10_2.1 · AlmaLinux:10Package registry (OSV)
debian:libxfont1:2.0.6-1+deb12u1 · Debian:12Package registry (OSV)
opensuse:libXfont22.0.7-2.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:libXfont20:2.0.3-2.el8_10.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libXfont20:2.0.6-5.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libXfont2-debuginfo0:2.0.3-2.el8_10.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libXfont2-debuginfo0:2.0.6-5.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libXfont2-debugsource0:2.0.3-2.el8_10.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libXfont2-debugsource0:2.0.6-5.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libXfont2-devel0:2.0.3-2.el8_10.1 · Red Hat:enterprise_linux:8::crbPackage registry (OSV)
red hat:libXfont2-devel0:2.0.6-5.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:libXfont20:2.0.3-2.el8_10.1 · Rocky Linux:8Package registry (OSV)
suse:libXfont22.0.7-160000.4.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-560010 days apartlibXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow
    35Monitor
  • CVE-2026-560020 days apartlibXfont2 PCF Font Parsing Heap Buffer Overflow
    35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records