CVE-2026-72522ModerateLocalRevised 23 Aug
libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.
Assessment
- Severity
- Moderate
- CVSS base score
- 6.2CVSS:3.1/
AV:L/ AC:L/ PR:N/ UI:N/ S:U/ C:N/ I:N/ A:H - Impact
- Not stated
- EPSS, next 30 days
- Not scored yet
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Not assessed
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Mariner
- Weakness
- CWE-125: Out-of-bounds Read
- Issued by
- mitre
- Published
- 11 Aug 2026 · August 2026
- Last revised
- 23 Aug 2026Information published.
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- LocalAV:L
- Attack complexity
- LowAC:L
- Privileges required
- NonePR:N
- User interaction
- NoneUI:N
- Scope
- UnchangedS:U
- Confidentiality
- NoneC:N
- Integrity
- NoneI:N
- Availability
- HighA:H
Updates that fix it
0 KBsNo KB listed
MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.
Affected products
1 affected product
- azl3 expat 2.8.2-1 on Azure Linux 3.0
What changed
First observed 14 Oct 2026- 14 Oct 2026 Source coverage: msrc-cvrfIncomplete → Current
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