CVE-2022-22823: debian debian_linux Integer Overflow or Wraparound
Vulnerability summary
CVE-2022-22823 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in debian debian_linux. EPSS estimates a 3.87% chance of exploitation in the next 30 days, higher than 90.2% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 21 · Related 8Timeline
- 08-01-2022PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
3.87%
Chance of exploitation in the next 30 days
Percentile
90%
Versus all other CVEs
30-day change
Increase +0.46 pp
From 3.40% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu17 products
- ayttmAll versions (No fix recorded)
- cableswigAll versions (No fix recorded)
- cadaverAll versions (No fix recorded)
- coin3All versions (No fix recorded)
- expat< 2.1.0-4ubuntu1.4+esm4 | < 2.1.0-7ubuntu0.16.04.5+esm2 | < 2.2.5-3ubuntu0.4 | < 2.2.9-1ubuntu0.2 | < 2.4.3-1
Debian3 products
- expat< 2.4.3-1
- libxmltokAll versions (No fix recorded)
- debian_linuxEOL10.0 | 11.0
Alpine1 product
- expat< 2.2.10-r0 | < 2.2.10-r2 | < 2.4.3-r0
Libexpat_project1 product
- libexpat< 2.4.3
Siemens1 product
Tenable1 product
- nessus< 8.15.3 | ≥ 10.0.0, < 10.1.1
6 vendors · 24 products
