Algorithm::AhoCorasick::XS versions through 0.04 for Perl read the haystack string length before the scalar is stringified
Summary
| CVE | CVE-2026-80490 |
|---|---|
| State | PUBLISHED |
| Assigner | CPANSec |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-30 16:19:10 UTC |
| Updated | 2026-09-30 19:57:08 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.002090000 probability, percentile 0.100110000 (date 2026-10-01)
Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read
There are no known software configurations currently associated with this CVE in NVD or the CVE Program record.
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| security.metacpan.org/patches/A/Algorithm-AhoCorasick-XS/0.04/CVE-2026-80490-r1.patch | 9b29abf9-4ab0-4765-b253-1875cd9b441e | security.metacpan.org | |
| metacpan.org/release/RJH/Algorithm-AhoCorasick-XS-0.04/source/typemap | 9b29abf9-4ab0-4765-b253-1875cd9b441e | metacpan.org | |
| github.com/richardjharris/Algorithm-AhoCorasick-XS/pull/1 | 9b29abf9-4ab0-4765-b253-1875cd9b441e | github.com | |
| rt.cpan.org/Ticket/Display.html | 9b29abf9-4ab0-4765-b253-1875cd9b441e | rt.cpan.org | |
| www.openwall.com/lists/oss-security/2026/09/30/15 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Workarounds
CNA: No fixed release is available. Apply the patch or the change in the linked pull request. For deployments that cannot apply the patch, ensure that all input passed to the matching functions is stringified, for example $ac->matches( "$input" );
There are currently no legacy QID mappings associated with this CVE.