Home/CVE/An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.
CVE

CVE-2024-45490

An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.

An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.

HIGH · CVSS 7.5 EPSS 0.00613
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
CWE-611Improper Restriction of XML External Entity Reference
▤

Affected Products & Versions

1
libexpat project libexpat< 2.6.3
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD30 Aug 2024 · 03:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

30
suse-csafSUSE-SU-2026:0044-1
suse-csafSUSE-SU-2025:4512-1
siemens-csafSSA-613116
siemens-csafSSA-082556
suse-csafSUSE-SU-2025:20311-1
🔗

References & Sources

11
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/libexpat/libexpat/issues/887Issue Tracking
https://github.com/libexpat/libexpat/pull/890Patch
http://seclists.org/fulldisclosure/2024/Dec/10
http://seclists.org/fulldisclosure/2024/Dec/12
http://seclists.org/fulldisclosure/2024/Dec/6
http://seclists.org/fulldisclosure/2024/Dec/7
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