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.
CVE-2026-22693
“—” beside the score: it is equal to NVD's CVSS score.
This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.5% (39th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-1871 (ENISA EUVD)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 5.3
- EG Score
- 5.3MEDIUMmedium confidence
- EG Risk
- 39EG Risk 39/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity53% × 45%Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.4% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.5%
- EPSS %ILE
- 39th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
January 10, 2026
Last Modified
June 17, 2026
Advisory Details (4)
Auto-updated Aug 9, 2026oss-security - Re: Null Pointer Dereference in HarfBuzz
http://www.openwall.com/lists/oss-security/2026/01/12/1oss-security - Null Pointer Dereference in HarfBuzz
http://www.openwall.com/lists/oss-security/2026/01/11/1Null Pointer Dereference in SubtableUnicodesCache::create leading to DoS · Advisory · harfbuzz/harfbuzz · GitHub
https://github.com/harfbuzz/harfbuzz/security/advisories/GHSA-xvjr-f2r9-c7wwcommit 1265ff8d9902 (harfbuzz/harfbuzz)
Patch available: harfbuzz/harfbuzz 12.3.1 (contains commit 1265ff8d9902)
https://github.com/harfbuzz/harfbuzz/commit/1265ff8d990284f04d8768f35b0e20ae5f60daaeVendor Advisories for CVE-2026-22693(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(1)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | harfbuzz-main-14.1.0-2.hum1 | 2026-04-13 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(4 across 4 ecosystems)
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| harfbuzz | 10.0.1-1 ... 9.0.0-1 (33 versions) |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| harfbuzz | 10.0.1-1 ... 9.0.0-1 (24 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| harfbuzz | 10.2.0-1 |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| harfbuzz | 10.2.0-1 ... 12.3.0-3 (9 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 39× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 99 of 205 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 106 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-31 04:25 UTCOSV refresh
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-25 14:42 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-23 05:35 UTCEG score recompute
- 2026-10-23 05:35 UTCVendor advisory
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-18 03:55 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 37th percentile
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- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-12 16:22 UTCEG score recompute
- 2026-10-11 20:04 UTCEG score recompute
- 2026-10-11 17:17 UTCEG score recompute
- 2026-10-11 14:48 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-08 22:55 UTCOSV refresh
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.4% · 35th percentile
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-19 05:30 UTCOSV refresh
- 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-08-31 08:58 UTCOSV refresh
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-14 15:09 UTCEG score recompute
- 2026-08-14 15:09 UTCVendor advisory
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-08-09 20:38 UTCEG score recompute
- 2026-08-09 20:38 UTCVendor advisory
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-08-08 01:05 UTCEG score recompute
- 2026-08-08 01:05 UTCVendor advisory
- 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-08-06 06:03 UTCEG score recompute
- 2026-08-06 06:03 UTCVendor advisory
- 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-08-03 10:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.4% · 30th percentile
Related CVEs(same product + same CWE)
Same product
6 shownDebian:11:harfbuzz · Debian:13:harfbuzz
Frequently asked(5)
What is CVE-2026-22693?
When was the CVE record for CVE-2026-22693 published?
Is CVE-2026-22693 actively exploited?
What is the CVSS score of CVE-2026-22693?
How do I remediate CVE-2026-22693?
Dependency Blast Radius
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