Groups > linux.debian.bugs.dist > #1277870

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 20:50 +0100
Message-ID	<MbN8d-9Alq-1@gated-at.bofh.it> (permalink)
References	<MbJHj-9yce-7@gated-at.bofh.it> <MbJHj-9yce-7@gated-at.bofh.it> <MbMOS-9AdM-5@gated-at.bofh.it> <MbJHj-9yce-7@gated-at.bofh.it> <MbMOS-9AdM-5@gated-at.bofh.it>
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Hi,

On Sat, Jan 10, 2026 at 08:16:59PM +0100, أحمد المحمودي wrote:
> On Sat, Jan 10, 2026 at 02:08:43PM +0100, Salvatore Bonaccorso wrote:
> > Source: harfbuzz
> > Version: 12.3.0-3
> > 
> > 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.
> ---end quoted text---
> 
> If the CVE has been fixed in 12.3.0, why is the bug filed against 
> 12.3.0-3 ?

Because the CVE description looks wrong. Looking at the code the patch
is
https://github.com/harfbuzz/harfbuzz/commit/1265ff8d990284f04d8768f35b0e20ae5f60daae
.

This change is not in 12.3.0 upstream and not in 12.3.0-3.

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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