CVE-2026-117610
Public on 2026-10-28
Modified on 2026-10-31
Description
libexpat through 2.9.0 contains a NULL pointer dereference vulnerability in externalEntityInitProcessor2() in lib/xmlparse.c that mishandles the XML_TOK_NONE token from empty input. Attackers who control stream chunking can force an empty non-final first parse on an external entity subparser, causing a later parse to crash the application.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Core | expat | Pending Fix | ||
| Amazon Linux 2023 | expat | Pending Fix | ||
| Amazon Linux 2027 Preview | expat | Pending Fix | ||
| Amazon Linux 2 - Firefox Extra | firefox | Pending Fix | ||
| Amazon Linux 2023 | firefox | Pending Fix | ||
| Amazon Linux 2027 Preview | firefox | Pending Fix | ||
| Amazon Linux 2 - Core | thunderbird | Pending Fix | ||
| Amazon Linux 2023 | xmlrpc-c | Not Affected | ||
| Amazon Linux 2027 Preview | xmlrpc-c | Not Affected |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |