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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-22693

22
FAUCET Score

CVE-2026-22693 is a null pointer dereference vulnerability in the HarfBuzz text shaping engine, affecting versions prior to 12.3.0. This flaw occurs in the SubtableUnicodesCache::create function when hb_malloc fails to allocate memory, leading to a segmentation fault and denial of service. Rated MEDIUM (CVSS 5.3), it can be triggered remotely with low attack complexity, requiring no user interaction or privileges. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 12.3.0CPE matchmatch criteria
cpe:2.3:a:harfbuzz_project:harfbuzz:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.38%
Probability of exploitation in next 30 days
EPSS Percentile
30.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0038 is in the 18th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (29)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 17496-17084Fixed in: 8.3.0-4
microsoftpatch availablevia msrc
Product: azl3 harfbuzz 8.3.0-4 on Azure Linux 3.0Fixed in: 8.3.0-4
microsoftpatch availablevia msrc
Product: azl3 harfbuzz 8.3.0-3 on Azure Linux 3.0Fixed in: 8.3.0-4
microsoftpatch availablevia msrc
Product: 20833-17084Fixed in: 8.3.0-4
redhatvendor investigatingvia redhat_api
Product: Red Hat build of OpenJDK 25Fixed in: java-25-openjdk-portable
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: firefox
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: harfbuzz
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: java-21-openjdk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: java-25-openjdk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: thunderbird
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: harfbuzz
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: firefox
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: harfbuzz
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: java-17-openjdk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: java-21-openjdk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mingw-harfbuzz
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: thunderbird
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: harfbuzz
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: java-17-openjdk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: java-21-openjdk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: java-25-openjdk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: thunderbird
redhatvendor investigatingvia redhat_api
Product: Red Hat build of OpenJDK 11 ELSFixed in: java-11-openjdk
redhatvendor investigatingvia redhat_api
Product: Red Hat build of OpenJDK 11 ELSFixed in: java-11-openjdk-portable
redhatvendor investigatingvia redhat_api
Product: Red Hat build of OpenJDK 17Fixed in: java-17-openjdk-portable
redhatvendor investigatingvia redhat_api
Product: Red Hat build of OpenJDK 21Fixed in: java-21-openjdk-portable

Vendor Advisories (2)

microsoft2026-Jan/CVE-2026-22693Moderate

Null Pointer Dereference in SubtableUnicodesCache::create leading to DoS

Jan 13, 2026
redhatCVE-2026-22693Moderate

harfbuzz: Null Pointer Dereference in harfbuzz

Jan 10, 2026

References

openwall.com / lists/oss-security/2026/01/11/1
ExploitMailing ListPatchThird Party Advisory
openwall.com / lists/oss-security/2026/01/12/1
ExploitMailing ListPatchThird Party Advisory
github.com / harfbuzz/harfbuzz/commit/1265ff8d990284f04d8768f35b0e20ae5f60daae
Patch
github.com / harfbuzz/harfbuzz/security/advisories/GHSA-xvjr-f2r9-c7ww
ExploitMitigationVendor Advisory