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Bug#1125189: harfbuzz: CVE-2026-22693

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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

#1277859 — Bug#1125189: harfbuzz: CVE-2026-22693

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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#1277867

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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 ?

-- 
‎أحمد المحمودي (Ahmed El-Mahmoudy)
 Digital design engineer
GPG KeyIDs: 4096R/A7EF5671 2048R/EDDDA1B7
GPG Fingerprints:
 6E2E E4BB 72E2 F417 D066  6ABF 7B30 B496 A7EF 5761
 8206 A196 2084 7E6D 0DF8  B176 BC19 6A94 EDDD A1B7

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#1277870

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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