DEBIAN-CVE-2026-85644
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-85644
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-85644.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-85644
- Upstream
- CVE-2026-85644
- Published
- 2026-09-28T17:17:51Z
- Modified
- 2026-10-04T17:00:12Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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);
- References
Affected packages
Debian:13 / libxs-parse-keyword-perl
Package
- Name
- libxs-parse-keyword-perl
- Purl
- pkg:deb/debian/libxs-parse-keyword-perl?arch=source&distro=trixie
Debian:14 / libxs-parse-keyword-perl
Package
- Name
- libxs-parse-keyword-perl
- Purl
- pkg:deb/debian/libxs-parse-keyword-perl?arch=source&distro=forky