CVE-2026-115506
Published: October 30, 2026Last modified: November 4, 2026
Description
libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | expat | Unknown (2.5.0-r0) |
| 25 LTS | expat | Fixed (2.10.0-r0) | |
| Stream | expat | Fixed (2.10.0-r0) | |
| Hardened Containers | 23 LTS | expat | Unknown (2.5.0-r0) |
| 25 LTS | expat | Unknown (2.7.1-r0) | |
| Stream | expat | Unknown (2.4.9-r0) |