CVE-2026-0943Public exploitNetwork attack vector

Process crash via unchecked allocation failure

Published Jan 19, 2026 · Updated Jan 19, 2026

A null pointer dereference in bundled HarfBuzz in HarfBuzz::Shaper before 0.032 allows attackers to crash a consuming process. SubtableUnicodesCache::create in src/hb-ot-cmap-table.hh passes an unchecked null return from hb_malloc to placement new during hb_subset_preprocess. The vulnerable path requires a consuming application to invoke font-subsetting preprocessing when allocation fails; ordinary shaping reachability is not established.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A null pointer dereference in bundled HarfBuzz in HarfBuzz::Shaper before 0.032 allows attackers to crash a consuming process. SubtableUnicodesCache::create in src/hb-ot-cmap-table.hh passes an unchecked null return from hb_malloc to placement new during hb_subset_preprocess. The vulnerable path requires a consuming application to invoke font-subsetting preprocessing when allocation fails; ordinary shaping reachability is not established.

The record

CVE
CVE-2026-0943
Published
Jan 19, 2026
Updated
Jan 19, 2026
Vendor
Johan Vromans
Product
HarfBuzz::Shaper
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.032

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Johan Vromans · HarfBuzz::Shaperversion=0 <0.032

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo