libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing… (CVE-2026-102633)
libexpat versions 2.7.2 through 2.8.5 have an integer overflow vulnerability in the expat_realloc() function on 32-bit platforms. This flaw can lead to heap buffer overflow, memory corruption, or denial of service when malicious XML is parsed. The vulnerability has a CVSS score of 5.9, indicating a high severity level.
AI Analysis
Technical Summary
An integer overflow vulnerability exists in the expat_realloc() function of libexpat on 32-bit platforms in versions 2.7.2 through 2.8.5. This occurs during the computation of allocation sizes, which can be exploited by attackers supplying crafted XML data to cause heap buffer overflow, memory corruption, or denial of service conditions in applications using the vulnerable library.
Potential Impact
Successful exploitation can cause denial of service or memory corruption in applications using libexpat versions 2.7.2 through 2.8.5 on 32-bit platforms. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted XML data with vulnerable versions on 32-bit platforms or apply other application-level mitigations to limit exposure.
libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing… (CVE-2026-102633)
Description
libexpat versions 2.7.2 through 2.8.5 have an integer overflow vulnerability in the expat_realloc() function on 32-bit platforms. This flaw can lead to heap buffer overflow, memory corruption, or denial of service when malicious XML is parsed. The vulnerability has a CVSS score of 5.9, indicating a high severity level.
CVSS v3.1
Score 5.9medium
Affected software
pkg:github/libexpat/libexpatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An integer overflow vulnerability exists in the expat_realloc() function of libexpat on 32-bit platforms in versions 2.7.2 through 2.8.5. This occurs during the computation of allocation sizes, which can be exploited by attackers supplying crafted XML data to cause heap buffer overflow, memory corruption, or denial of service conditions in applications using the vulnerable library.
Potential Impact
Successful exploitation can cause denial of service or memory corruption in applications using libexpat versions 2.7.2 through 2.8.5 on 32-bit platforms. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted XML data with vulnerable versions on 32-bit platforms or apply other application-level mitigations to limit exposure.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-533f-rf84-jgcc
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-102633"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6abc27c1680226ef6846f80a
Added to database: 09/29/2026, 21:04:01 UTC
Last enriched: 09/29/2026, 21:17:28 UTC
Last updated: 09/30/2026, 03:15:18 UTC
Views: 4
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