X.Org libXfont2 up to 2.0.7 Glyph Parser pcfReadFont heap-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k0.60+

Summaryinfo

A vulnerability described as critical has been identified in X.Org libXfont2 up to 2.0.7. The affected element is the function pcfReadFont of the component Glyph Parser. Executing a manipulation can lead to heap-based overflow. This vulnerability is tracked as CVE-2026-56002. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in X.Org libXfont2 up to 2.0.7. This vulnerability affects the function pcfReadFont of the component Glyph Parser. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at gitlab.freedesktop.org. This vulnerability was named CVE-2026-56002 since 06/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit.

Upgrading to version 2.0.8 eliminates this vulnerability.

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Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: libXfont2 2.0.8

Timelineinfo

06/18/2026 CVE reserved
07/08/2026 +20 days Advisory disclosed
07/08/2026 +0 days VulDB entry created
07/08/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: x.org

Advisory: gitlab.freedesktop.org
Status: Confirmed

CVE: CVE-2026-56002 (🔒)
GCVE (CVE): GCVE-0-2026-56002
GCVE (VulDB): GCVE-100-376822

Entryinfo

Created: 07/08/2026 12:18
Changes: 07/08/2026 12:18 (54)
Complete: 🔍
Cache ID: 216::103

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