CVE-2024-45490: libexpat_project libexpat
Vulnerability summary
CVE-2024-45490 is a critical (CVSS 9.8) vulnerability in libexpat_project libexpat. EPSS estimates a 1.69% chance of exploitation in the next 30 days, higher than 77% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 25 · Related 20Timeline
- 30-08-2024PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.
CVSS metrics
7 scores · 7 sources · 1 version- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
- OSV · WolfiEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · ChainguardEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
EPSS trend
Probability
1.69%
Chance of exploitation in the next 30 days
Percentile
77%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.69% 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 cause- CWE-611Improper Restriction of XML External Entity ReferenceThe product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
- CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu16 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 · 24 products
