libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow
Priority MEDIUM 40CWE-122Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.
Summary
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
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00392 33rd percentileScored 2026-11-07
Fix Fixed libXfont2 (X.Org): 2.0.8Red Hat: 11 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA libXfont2 (X.Org) Fixed in 2.0.8
Red Hat 11 advisories
- RHSA-2026:51059 Released 2026-08-06 · Red Hat rating ImportantlibXfont2 security update
- Red Hat CodeReady Linux Builder EUS (v.9.6) libXfont2-devel-2.0.3-12.el9_6.1
- Red Hat Enterprise Linux AppStream EUS (v.9.6) libXfont2-2.0.3-12.el9_6.1
- RHSA-2026:51066 Released 2026-08-06 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream AUS (v.8.6) libXfont2-2.0.3-2.el8_6.1
- Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) libXfont2-2.0.3-2.el8_6.1
- RHSA-2026:51063 Released 2026-08-06 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux Server (v. 7 ELS) libXfont2-2.0.3-2.el7_9, libXfont2-2.0.3-2.el7_9.ppc
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) libXfont2-devel-2.0.3-2.el7_9, libXfont2-devel-2.0.3-2.el7_9.ppc
Show 8 more Red Hat advisories
- RHSA-2026:51067 Released 2026-08-06 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream E4S (v.8.8) libXfont2-2.0.3-2.el8_8.1
- Red Hat Enterprise Linux AppStream TUS (v.8.8) libXfont2-2.0.3-2.el8_8.1
- RHSA-2026:51058 Released 2026-08-06 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream E4S (v.9.4) libXfont2-2.0.3-12.el9_4.1
- RHSA-2026:51062 Released 2026-08-06 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) libXfont2-2.0.3-12.el9_2.1
- RHSA-2026:51060 Released 2026-08-06 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) libXfont2-2.0.3-2.el8_4.1
- Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) libXfont2-2.0.3-2.el8_4.1
- RHSA-2026:51061 Released 2026-08-06 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) libXfont2-2.0.6-5.el10_0.1
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libXfont2-devel-2.0.6-5.el10_0.1
- RHSA-2026:47084 Released 2026-08-03 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream (v. 9) libXfont2-2.0.3-12.el9_8.1
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libXfont2-devel-2.0.3-12.el9_8.1
- RHSA-2026:47103 Released 2026-07-28 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream (v. 8) libXfont2-2.0.3-2.el8_10.1
- Red Hat Enterprise Linux CRB (v. 8) libXfont2-devel-2.0.3-2.el8_10.1
- RHSA-2026:47079 Released 2026-07-28 · Red Hat rating ImportantlibXfont2 security update
- Red Hat Enterprise Linux AppStream (v. 10) libXfont2-2.0.6-5.el10_2.1
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libXfont2-devel-2.0.6-5.el10_2.1
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
X.Org libXfont2 — openwall.com/lists/oss-security/2026/07/08/1
3 records Highest priority Priority MEDIUM 3 MEDIUM
Other records, highest priority first
- TI-2026-40398 libXfont2 computeProps Property Buffer Heap Buffer OverflowPriority MEDIUM 40
- TI-2026-40397 libXfont2 PCF Font Parsing Heap Buffer OverflowPriority MEDIUM 40
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:51059 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:47079 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2026:47103 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:47084 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2026:51060 |
| Red Hat Enterprise Linux AppStream AUS (v.8.6) | Fixed | RHSA-2026:51066 |
| Red Hat Enterprise Linux AppStream E4S (v.8.8) | Fixed | RHSA-2026:51067 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:51062 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:51058 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:51061 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:51059 |
| Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:51060 |
| Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) | Fixed | RHSA-2026:51066 |
| Red Hat Enterprise Linux AppStream TUS (v.8.8) | Fixed | RHSA-2026:51067 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:47103 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:47079 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:47084 |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:51061 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:51063 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:51063 |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-56001
- 2026-10-03 Alias added: GHSA-j726-7g32-78m6
References
More x.org vulnerabilities
- TI-2022-25238 In X.Org X server 20.11 through 21.1.16, when a client application uses easystroke for… CVSS 3.1HIGH 7.7
- TI-1999-00519 An X server's access control is disabled (e.g. CVSS 2.0HIGH 10.0
- TI-2021-11657 LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote… CVSS 3.1CRITICAL 9.8
- TI-2018-10465 An issue was discovered in libX11 through 1.6.5. CVSS 3.0CRITICAL 9.8
- TI-2004-00826 Multiple vulnerabilities in libXpm for 6.8.1 and earlier, as used in XFree86 and other… CVSS 2.0HIGH 10.0
- TI-2016-08240 Multiple integer overflows in libXpm before 3.5.12, when a program requests parsing XPM… CVSS 3.0CRITICAL 9.8
Sources
- CVE-2026-56001 · CVE Program
- CVE-2026-56001 · NVD
- FIRST EPSS
- GHSA-j726-7g32-78m6 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-56001 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences