CVE-2026-56002

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.

CVSS v3 8.5 HIGH

8.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674	Patch
https://www.openwall.com/lists/oss-security/2026/07/08/1	Mailing List Patch Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:x:libxfont:*:*:*:*:*:*:*:*

History

13 Jul 2026, 13:57

Type	Values Removed	Values Added
References	~~() https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674 -~~	() https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674 - Patch
References	~~() https://www.openwall.com/lists/oss-security/2026/07/08/1 -~~	() https://www.openwall.com/lists/oss-security/2026/07/08/1 - Mailing List, Patch, Third Party Advisory
First Time		X X libxfont
CPE		cpe:2.3:a:x:libxfont::::::::

08 Jul 2026, 10:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-08 10:16

Updated : 2026-07-13 13:57

NVD link : CVE-2026-56002

Mitre link : CVE-2026-56002

CVE.ORG link : CVE-2026-56002

JSON object : View

Products Affected

x

libxfont

CWE

CWE-122

Heap-based Buffer Overflow

{"id": "CVE-2026-56002", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-56002", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-08T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "meissner@suse.de", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 1.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "meissner@suse.de", "affectedData": [{"repo": "https://gitlab.freedesktop.org/xorg/lib/libxfont", "vendor": "X.Org", "product": "libXfont2", "versions": [{"status": "affected", "version": "0", "lessThan": "2.0.8", "versionType": "rpm"}], "packageName": "libXfont2", "defaultStatus": "unaffected"}]}], "published": "2026-07-08T10:16:23.327", "references": [{"url": "https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674", "tags": ["Patch"], "source": "meissner@suse.de"}, {"url": "https://www.openwall.com/lists/oss-security/2026/07/08/1", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "source": "meissner@suse.de"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "meissner@suse.de", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "A heap bufferflow in pcfReadFont() due to missing glyph bounds checking\u00a0in libXfont2 before 2.0.8\u00a0 allows attackers authenticated as X client to execute code within the X server."}], "lastModified": "2026-07-13T13:57:14.900", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:x:libxfont:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6B6981B1-C366-45C6-A1FB-4F7B492F251E", "versionEndExcluding": "2.0.8"}], "operator": "OR"}]}], "sourceIdentifier": "meissner@suse.de"}