X.Org libXfont2 up to 2.0.7 BitmapScaleBitmaps 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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9.5$0-$5k3.01+

Summaryinfo

A vulnerability labeled as very critical has been found in X.Org libXfont2 up to 2.0.7. This issue affects the function BitmapScaleBitmaps of the component BitmapScaleBitmaps. Such manipulation leads to heap-based overflow. This vulnerability is referenced as CVE-2026-56001. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in X.Org libXfont2 up to 2.0.7. It has been rated as very critical. Affected by this issue is the function BitmapScaleBitmaps of the component BitmapScaleBitmaps. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to 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(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont

The advisory is shared for download at openwall.com. This vulnerability is handled as CVE-2026-56001 since 06/18/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/08/2026).

Upgrading to version 2.0.8 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
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: openwall.com
Status: Confirmed

CVE: CVE-2026-56001 (🔒)
GCVE (CVE): GCVE-0-2026-56001
GCVE (VulDB): GCVE-100-376820

Entryinfo

Created: 07/08/2026 11:35
Changes: 07/08/2026 11:35 (54)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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