HarfBuzz heap-buffer-overflow on hb_cairo_glyphs_from_buffer
Priority HIGH 75CWE-122Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.
Summary
HarfBuzz is a text shaping engine. Starting with 8.5.0 through 10.0.1, there is a heap-based buffer overflow in the hb_cairo_glyphs_from_buffer function.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00652 51st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| harfbuzz | harfbuzz | 8.5.0 – 10.0.1 | — | No fix listed | CNA |
- harfbuzz Vendorharfbuzz Affected 8.5.0 – 10.0.1 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:harfbuzz_project:harfbuzz:*:*:*:*:*:*:*:* | 8.5.0 – 10.0.1 | Vulnerable | Harfbuzz Project |
- cpe:2.3:a:harfbuzz_project:harfbuzz:*:*:*:*:*:*:*:* Versions 8.5.0 – 10.0.1 Vulnerable ·Harfbuzz Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-56732
- 2026-10-14 EPSS moved to the 50th–90th percentile
References
More harfbuzz vulnerabilities
- TI-2026-76946 Out-of-bounds write in HarfBuzz WebAssembly font shaper CVSS 4.0HIGH 7.3
- TI-2026-76947 NULL pointer dereference in HarfBuzz WebAssembly shaper crashes apps CVSS 4.0MEDIUM 6.8
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences