XML::Parser versions through 2.45 for Perl could overflow the pre-allocated buffer size cause a heap corruption (double free or corruption) and crashes.
A :utf8 PerlIO layer, parse_stream() in Expat.xs could overflow the XML input buffer because Perl's read() returns decoded characters while SvPV() gives back multi-byte UTF-8 bytes that can exceed the pre-allocated buffer size. This can cause heap corruption (double free or corruption) and crashes.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Toddr Xml\
cpe:2.3:a:toddr:xml\:\:parser:*:*:*:*:*:perl:*:*
|
— |
2.48
|
References 7
https://github.com/cpan-authors/XML-Parser/commit/6b291f4d260fc124a6ec80382b87a…
9b29abf9-4ab0-4765-b253-1875cd9b441e
https://github.com/cpan-authors/XML-Parser/issues/64
9b29abf9-4ab0-4765-b253-1875cd9b441e
https://rt.cpan.org/Ticket/Display.html?id=19859
9b29abf9-4ab0-4765-b253-1875cd9b441e
http://www.openwall.com/lists/oss-security/2026/03/19/1
af854a3a-2127-422b-91ae-364da2661108
https://github.com/cpan-authors/XML-Parser/commit/56b0509dfc6b559cd7555ea81ee62…
9b29abf9-4ab0-4765-b253-1875cd9b441e
https://metacpan.org/release/TODDR/XML-Parser-2.46/changes
9b29abf9-4ab0-4765-b253-1875cd9b441e
http://www.openwall.com/lists/oss-security/2026/03/22/3
af854a3a-2127-422b-91ae-364da2661108