CVE-2026-102633
libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc
- State
- Published
- Severity
- 8.2 High
- Published
- Sep 29, 2026
- Updated
- Sep 29, 2026
- Reserved
- Sep 29, 2026
Description
libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.9 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
libexpatlibexpat |
|
References
- Pull Request #1392issue-trackingpatch
- Patch Commitpatch
- https://github.com/libexpat/libexpat/blob/R_2_8_5/expat/lib/xmlparse.c#L1003technical-description
- https://github.com/libexpat/libexpatproduct
- VulnCheck Advisory: libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_reallocthird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.