CVE-2026-117610
Published:October 28, 2026
Updated:November 04, 2026
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.
Affected Packages
expat (CONAN):
Affected version(s) >=2.2.7 <2.10.0Fix Suggestion:
Update to version 2.10.0https://github.com/libexpat/libexpat.git (GITHUB):
Affected version(s) >=V1_0 <R_2_10_0 || >=R_1_95_0 <R_2_10_0 || >=R_2_0_0 <R_2_10_0Fix Suggestion:
Update to version R_2_10_0Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
NULL Pointer Dereference
EPSS
Base Score:
0.43