Algorithm::AhoCorasick::XS up to 0.04 matches/first_match/match_details out-of-bounds

Summaryinfo

A vulnerability has been found in Algorithm::AhoCorasick::XS up to 0.04 and classified as critical. Affected by this issue is the function matches/first_match/match_details. This manipulation causes out-of-bounds. This vulnerability appears as CVE-2026-80490. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in Algorithm::AhoCorasick::XS up to 0.04 and classified as critical. Affected by this vulnerability is the function matches/first_match/match_details. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Algorithm::AhoCorasick::XS versions through 0.04 for Perl read the haystack string length before the scalar is stringified. The matches, first_match and match_details methods use the T_STD_STRING typemap to translate Perl scalars (SVs) into strings via the std::string constructor, using the SvPV macro to stringify the haystack input, and the SvCUR macro to determine the length of the SV. When the input SVs are references, integers (IVs) or floats (NVs), the SvCUR macro will return an invalid length if it is run before the input is stringified, leading to an out-of-bounds read which can abort the process. Note that the evaluation order of arguments to std::string is unspecified. Depending on the compiler, SvCUR may be run first and lead to an abort that cannot be caught within Perl. This can be triggered when the haystack is a numeric value, for example, my $ac = Algorithm::AhoCorasick::XS->new( [ "11", "22" ] ); $ac->matches( 211 ); This can occur when the haystack is the result of reading data from decoded JSON or a numeric database column. It can also be triggered when using a blessed object as a haystack.

It is possible to read the advisory at rt.cpan.org. This vulnerability is known as CVE-2026-80490 since 08/26/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/30/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• Algorithm::AhoCorasick::XS

Version

• 0.04

CPE 2.3info

• 🔒

CPE 2.2info

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