SB2026111222 - Out-of-bounds read in HarfBuzz

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Main Vulnerability Database SB2026111222

SB2026111222 - Out-of-bounds read in HarfBuzz

Published: November 12, 2026

Security Bulletin ID SB2026111222
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: N/A)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References