SB2026042872 - Stack-based buffer overflow in HarfBuzz

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Main Vulnerability Database SB2026042872

SB2026042872 - Stack-based buffer overflow in HarfBuzz

Published: April 28, 2026

Security Bulletin ID SB2026042872
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Stack-based buffer overflow (CVE-ID: N/A)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to overwrite other data.

The vulnerability exists due to a stack-based buffer overflow in debug messaging in Sequence.hh when processing a maliciously crafted OpenType font with a GSUB sequence lookup. A remote attacker can supply a crafted font that injects a large number of glyphs to overwrite other data.

The issue is reachable only when debug messaging is enabled using hb_buffer_set_message_func.


Remediation

Install update from vendor's website.

References