Out-of-bounds read in HarfBuzz - #VU165948
Published: November 11, 2026
Vulnerability identifier: #VU165948
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially crash a process or disclose adjacent process memory through generated fonts.
The vulnerability exists due to an out-of-bounds read in libharfbuzz-subset when substitute feature parameters are copied during font subsetting or instancing without tag-specific validation during sanitization. A remote attacker can supply a crafted OpenType font to trigger reads beyond the feature table and potentially its allocation, causing a crash or exposing memory if the generated font is obtained.
Affected software
HarfBuzz
Remediation
Install security update from vendor's website.
HarfBuzz - update to 15.0.0