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TI-2026-76946 Aliases CVE-2026-113679GHSA-hqgm-v7cx-mq25

Out-of-bounds write in HarfBuzz WebAssembly font shaper

Priority LOW 33CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
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 and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

HarfBuzz 8.0.0 through 14.6.0 contains an out-of-bounds write (CWE-787) in its experimental WebAssembly shaper. The font_glyph_to_string import has a wrong WAMR signature, so a crafted font can place the output buffer near the end of linear memory and write glyph-name bytes into host memory. A local attacker can crash or corrupt applications this way, and user interaction is required.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

HarfBuzz 8.0.0 through 14.6.0 contains an out-of-bounds write vulnerability in the experimental WebAssembly shaper because the font_glyph_to_string import has a wrong WAMR signature. Attackers can supply a crafted font whose wasm module places the output buffer near linear memory's end, writing glyph-name bytes into host memory to crash or corrupt applications.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00169 6th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

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

VendorProductAffected versionsFixed inStatusSource
harfbuzzharfbuzz8.0.0 – 14.6.0—No fix listedCNA
  • harfbuzz Vendorharfbuzz Affected 8.0.0 – 14.6.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for HarfBuzz. Red Hat rates the issue Moderate and lists Red Hat Enterprise Linux 10 as affected with no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-113679
  2. 2026-10-20 CISA SSVC decision points changed
  3. 2026-10-20 Priority changed: MEDIUM → LOW
  4. 2026-10-21 Alias added: GHSA-hqgm-v7cx-mq25
  5. 2026-10-21 Affected versions changed · Red Hat
  6. 2026-10-21 CVSS score added · Red Hat
  7. 2026-10-21 Affected versions changed · Red Hat
  8. 2026-10-23 Affected versions changed · Red Hat

References

Patch 2

Other 2

  • 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