CVE-2024-45492: libexpat_project libexpat Integer Overflow or Wraparound
Vulnerability summary
CVE-2024-45492 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in libexpat_project libexpat. EPSS estimates a 1.38% chance of exploitation in the next 30 days, higher than 72.1% of scored vulnerabilities.
Severe, CVSS 7.3 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 24 · Related 19Timeline
- 30-08-2024PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
An issue was discovered in libexpat before 2.6.3. nextScaffoldPart in xmlparse.c can have an integer overflow for m_groupSize on 32-bit platforms (where UINT_MAX equals SIZE_MAX).
CVSS metrics
7 scores · 7 sources · 1 version- CVE.orgCNA7.3HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:LDiffers
- 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
- OSV · WolfiEcosystem advisory · calculated7.3HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:LDiffers
- OSV · ChainguardEcosystem advisory · calculated7.3HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:LDiffers
EPSS trend
Probability
1.38%
Chance of exploitation in the next 30 days
Percentile
72%
Versus all other CVEs
30-day change
Decrease -0.01 pp
From 1.39% 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.
Ubuntu15 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+esm9 | < 2.1.0-7ubuntu0.16.04.5+esm9 | < 2.2.5-3ubuntu0.9+esm1 | < 2.2.9-1ubuntu0.7 | < 2.4.7-1ubuntu0.4 | < 2.6.1-2ubuntu0.1
Alpine3 products
- expat< 2.6.3-r0
- qt5-qtwebengine< 5.15.16-r12 | < 5.15.17-r3
- qt6-qtwebengine< 6.7.2-r6
Debian2 products
- expat< 2.5.0-1+deb12u1 | < 2.6.2-2
- libxmltokAll versions (No fix recorded)
Chainguard1 product
- expat< 2.6.3-r0
Libexpat_project1 product
- libexpat< 2.6.3
Wolfi1 product
- expat< 2.6.3-r0
6 vendors · 23 products
