fontconfig before 2.17.1 has an off-by-one error in allocation during sfnt capability…
Priority LOW 33CWE-193Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 1 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-193 and the CVSS impact.
Summary
fontconfig before 2.17.1 has an off-by-one error in allocation during sfnt capability handling, leading to a one-byte out-of-bounds write, and potentially a crash or code execution. This is in FcFontCapabilities in fcfreetype.c.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00129 2nd percentileScored 2026-11-07
Fix Partial fontconfig (fontconfig project): 2.17.1Red Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| fontconfig project | fontconfig | before 2.17.1 | 2.17.1 | Patch available | CNA |
- fontconfig Vendorfontconfig project Affected before 2.17.1 Fixed in 2.17.1 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fontconfig_project:fontconfig:2.17.0:*:*:*:*:*:*:* | 2.17.0 | Vulnerable | fontconfig project |
- cpe:2.3:a:fontconfig_project:fontconfig:2.17.0:*:*:*:*:*:*:* Versions 2.17.0 Vulnerable ·fontconfig project
Remediation
- Fix · CNA fontconfig (fontconfig project) Fixed in 2.17.1
Red Hat 1 advisory
- RHSA-2026:13722 Released 2026-05-05 · Red Hat rating ModerateRed Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images fontconfig-2.17.1-0.1.hum1@aarch64, fontconfig-2.17.1-0.1.hum1@src, fontconfig-2.17.1-0.1.hum1@x86_64 +4
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Hardened Images | Fixed | RHSA-2026:13722 |
Not affected: 4 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34085
- 2026-10-03 Alias added: GHSA-jxv8-p782-98cx
References
More fontconfig project Fontconfig vulnerabilities
- TI-2016-04663 fontconfig before 2.12.1 does not validate offsets, which allows local users to trigger… CVSS 3.1HIGH 7.8
Sources
- CVE-2026-34085 · CVE Program
- CVE-2026-34085 · NVD
- FIRST EPSS
- GHSA-jxv8-p782-98cx · GitHub Advisory Database · CC BY 4.0
- CVE-2026-34085 · 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