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Bug#1125189: harfbuzz: CVE-2026-22693

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist
Subject	Bug#1125189: harfbuzz: CVE-2026-22693
Date	2026-01-10 17:10 +0100
Message-ID	<MbJHj-9yce-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Source: harfbuzz
Version: 12.3.0-3
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for harfbuzz.

CVE-2026-22693[0]:
| HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null
| pointer dereference vulnerability exists in the
| SubtableUnicodesCache::create function located in src/hb-ot-cmap-
| table.hh. The function fails to check if hb_malloc returns NULL
| before using placement new to construct an object at the returned
| pointer address. When hb_malloc fails to allocate memory (which can
| occur in low-memory conditions or when using custom allocators that
| simulate allocation failures), it returns NULL. The code then
| attempts to call the constructor on this null pointer using
| placement new syntax, resulting in undefined behavior and a
| Segmentation Fault. This issue has been patched in version 12.3.0.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-22693
    https://www.cve.org/CVERecord?id=CVE-2026-22693
[1] https://github.com/harfbuzz/harfbuzz/security/advisories/GHSA-xvjr-f2r9-c7ww
[2] https://github.com/harfbuzz/harfbuzz/commit/1265ff8d990284f04d8768f35b0e20ae5f60daae

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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Bug#1125189: harfbuzz: CVE-2026-22693 Salvatore Bonaccorso <carnil@debian.org> - 2026-01-10 17:10 +0100
  Bug#1125189: harfbuzz: CVE-2026-22693 أحمد المحمودي <aelmahmoudy@users.sourceforge.net> - 2026-01-10 20:30 +0100
    Bug#1125189: harfbuzz: CVE-2026-22693 Salvatore Bonaccorso <carnil@debian.org> - 2026-01-10 20:50 +0100

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