CVE-2026-85644
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
XS::Parse::Infix versions 0.40 through 0.49 for Perl incorrectly treat a number as an array reference. The wrapper function uses SvRV() instead of SvROK(), failing to validate the argument type, which can lead to a segmentation fault or dereferencing an attacker-controlled address. An application processing input (e.g., from JSON) may allow an attacker to cause a crash or potentially execute code.
Risk Assessment
An attacker can cause a crash (segfault) or potentially achieve code execution by supplying a crafted number in a list of arguments. This impacts confidentiality, integrity, and availability of applications using this library.
Recommendation
Update XS::Parse::Infix to a version later than 0.49 if available, or avoid passing untrusted data to list-associative operators. Consider implementing type validation on the application side.
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Original NVD description (English source)
XS::Parse::Infix versions from 0.40 through 0.49 for Perl treat a number as an array reference. The wrapper function XS::Parse::Infix generates for a list-associative infix operator checks whether arguments are array references, but it tests using SvRV() rather than SvROK(). SvRV() reads a union slot that only holds a referent once SvROK(sv) is true, so the guard never validates that it is a reference. For an IV or NV that slot holds the number itself, SvRV() returns the caller's value and SvTYPE() dereferences it at offset 12. This will generally result in a segmentation fault. An application that hands the wrapper a list built from decoded input (for example, from JSON) lets whoever supplies a number in that list choose the address that the interpreter dereferences. An ordinary string's byte 12 is rarely SVt_PVAV so the guard croaks by luck, but an attacker-crafted string carrying 0x0b there passes, and the buffer is then used as an AV head, with AvARRAY taken from bytes 16-23 and its entries pushed onto the Perl stack as live SVs. A simple proof-of-concept uses the zip operator: use Syntax::Operator::Zip 'zip'; my @args = ([1], 2); zip(@args);
Vulnerability data from NVD (NIST) · CISA KEV · EPSS