CVE-2022-23852
A public proof of concept exists; no exploitation attested.
- Published2022-01-24
- Fixed in10.1.1 · 8.15.3
- WeaknessCWE-190
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero XML_CONTEXT_BYTES.
Timeline
dates in UTC- 2022-01-2402:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-23852?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-23852?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 10.x | ≥ 10.0.0, < 10.1.1 | 10.1.1 | NVD |
| 8.15 | < 8.15.3 | 8.15.3 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.0 | = 9.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.4 | < 2.4.4 | 2.4.4 | NVD |
4 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- expatAlmaLinux:8all versions · fixed in 2.2.5-8.el8_6.2and 1 other package
Fix
- Update Tenable nessus to 10.1.1 · 8.15.3
Advisories and patches
- github.comPatch
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 1 repository, unverifiedSatheesh575555/external_expat_AOSP10_r33_CVE-2022-23852 PoC-in-GitHub
Sources
- CISA-ADPSSVC decisionnone2025-04-23
- OpenCVESSVC decisionnone—
- CISA-ADPCVSS 3.19.82025-05-05
- NVDCVSS 3.19.8read 2026-10-23
- NVDCVSS 2.07.5read 2026-10-23
- CISA-ADPweakness (CWE)CWE-1902025-05-05
- NVDweakness (CWE)CWE-190read 2026-10-23
- FIRST EPSSEPSS score5.1 %2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2022-01-24
- Last Modified
- 2026-10-14
- NVD status
- Modified
Frequently asked questions
What is CVE-2022-23852?
Is CVE-2022-23852 actively exploited?
What is the CVSS score for CVE-2022-23852?
Running expat? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.