{"id":"CVE-2026-85644","title":"XS::Parse::Infix versions from 0.40 through 0.49 for Perl treat a number as an array reference.\n\nThe wrapper function XS::Parse::Infix generates for a list-associative infix operator checks whether arguments are array references, but it …","summary":"XS::Parse::Infix versions from 0.40 through 0.49 for Perl treat a number as an array reference.\n\nThe wrapper function XS::Parse::Infix generates for a list-associative infix operator checks whether arguments are array references, but it …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-125","CWE-843"],"vendor":"Red Hat","product":"XS-Parse-Keyword","affected":["XS-Parse-Keyword >= 0.40 <= 0.49"],"published":"2026-09-28","updated":"2026-09-30","sourceUpdated":"2026-09-30T20:17:34.993","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85644","references":[{"url":"https://metacpan.org/release/PEVANS/XS-Parse-Keyword-0.50/changes","label":"9b29abf9-4ab0-4765-b253-1875cd9b441e"},{"url":"https://metacpan.org/release/PEVANS/XS-Parse-Keyword-0.50/diff/PEVANS/XS-Parse-Keyword-0.49#src/infix.c","label":"9b29abf9-4ab0-4765-b253-1875cd9b441e"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/28/14","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85644.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-85644"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542563"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-85644"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85644"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-30T19:50:11.084770Z"},"epss":0.00373,"epssPercentile":0.31112,"ingestedAt":"2026-09-28T17:16:27.816Z","slug":"CVE-2026-85644","body":"## Overview\n\nXS::Parse::Infix versions from 0.40 through 0.49 for Perl treat a number as an array reference.\n\nThe 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.\n\nAn 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.\n\nAn 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.\n\nA simple proof-of-concept uses the zip operator:\n\n    use Syntax::Operator::Zip 'zip';\n\n    my @args = ([1], 2);\n    zip(@args);\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85644.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":212579,"id":"CVE-2026-85644","ts":1790668214889,"field":"cvss","old":null,"new":"7.5"},{"seq":212578,"id":"CVE-2026-85644","ts":1790668214889,"field":"severity","old":"none","new":"high"}]}