CVE-2026-102633
Published: September 30, 2026Last modified: October 17, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack Vector | NETWORK |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | expat | Fixed (2.9.0-r0) |
| 25 LTS | expat | Fixed (2.9.0-r0) | |
| Stream | expat | Fixed (2.9.0-r0) | |
| Hardened Containers | 23 LTS | expat | Fixed (2.9.0-r0) |
| 25 LTS | expat | Fixed (2.9.0-r0) | |
| Stream | expat | Fixed (2.9.0-r0) |
References
- https://github.com/libexpat/libexpat
- https://github.com/libexpat/libexpat/blob/R_2_8_5/expat/lib/xmlparse.c#L1003
- https://github.com/libexpat/libexpat/commit/209801d7fbaf07ab74bae8cb32dd2ab9e5846118
- https://github.com/libexpat/libexpat/pull/1392
- https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.8.5-integer-overflow-in-expat-realloc