ZDI-26-831: Apple macOS CoreText GDEF LigCaretList Out-Of-Bounds Read Information Disclosure Vulnerability
Source Zero Day Initiative
Not known to be exploited : upgrade to 27.2 or 26.7.2 soon.
Data as of 30 Oct 2026, 06:59 UTC
Rated High by Zero Day Initiative · CVSS not yet scored by NVD
Thin evidence
One scorer or none- EPSS
- 0.2% chance of exploitation in 30 days – higher than 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 27.2, 26.7.2, 15.8.2
Exploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade iOS and iPadOS to 27.2 or 26.7.2; macOS to 27.2, 26.7.2 or 15.8.2; tvOS and visionOS and watchOS to 27.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| AppleiOS and iPadOS | Affected
| Fixed in
|
| AppleiOS and iPadOS | Affected
| Fixed in
|
| ApplemacOS | Affected
| Fixed in
|
| ApplemacOS | Affected
| Fixed in
|
| ApplemacOS | Affected
| Fixed in
|
| AppletvOS | Affected
| Fixed in
|
AI-suggested
Users should exercise caution when opening files or visiting webpages from untrusted sources.
Description
An information disclosure vulnerability exists in Apple macOS CoreText related to the GDEF LigCaretList component. Exploitation requires user interaction, such as visiting a malicious webpage or opening a malicious file. The vulnerability has a low severity rating.