Title: Cpanel::JSON::XS de RURBAN, Description: Las versiones de Cpanel::JSON::XS anteriores a la 4.41 para Perl permiten la denegación de servicio a través de una entrada prefijada con BOM UTF-8 cuando una devolución de llamada de filtro de decodificación lanza una excepción.

Para omitir un BOM UTF-8 inicial de 3 bytes, decode_json() avanza el puntero de cadena del escalar de entrada más allá de la marca con SvPV_set() y lo restaura solo en la ruta de retorno normal. Cuando la decodificación se aborta a través de una excepción de Perl, por ejemplo, una devolución de llamada filter_json_object que falla, la restauración se omite y el escalar queda con su puntero de cadena desplazado dentro de su propio búfer y una longitud acortada.

Cuando ese escalar se libera posteriormente, el asignador recibe un puntero no válido y el intérprete se aborta. Un único documento prefijado con BOM decodificado con una devolución de llamada de filtro que lanza una excepción bloquea a cualquier llamador.

{"timestamp":"2026-06-03T15:58:42.977647Z","id":"CVE-2026-9516","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"RURBAN","product":"Cpanel::JSON::XS","defaultStatus":"unaffected","collectionURL":"https://cpan.org/modules","packageName":"Cpanel-JSON-XS","programFiles":["XS.xs"],"programRoutines":[{"name":"decode_json"}],"repo":"https://github.com/rurban/Cpanel-JSON-XS","versions":[{"version":"0","lessThan":"4.41","versionType":"custom","status":"affected"}]}]

OR
          *cpe:2.3:a:rurban:cpanel::json::xs:*:*:*:*:*:perl:*:* versions up to (excluding) 4.41

CPANSec: https://github.com/rurban/Cpanel-JSON-XS/commit/dfe1b41a36caba51dc12a2917fe50285d1ffaa7b.patch Types: Patch

CPANSec: https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.41/changes Types: Release Notes

CVE: http://www.openwall.com/lists/oss-security/2026/06/03/5 Types: Mailing List, Patch, Third Party Advisory

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

http://www.openwall.com/lists/oss-security/2026/06/03/5

Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws.

To skip a leading 3-byte UTF-8 BOM, decode_json() advances the input scalar's string pointer past the mark with SvPV_set() and restores it only on the normal return path. When decoding aborts through a Perl exception, for example a filter_json_object callback that croaks, the restore is skipped and the scalar is left with its string pointer offset into its own buffer and a shortened length.

When that scalar is later freed, the allocator receives an invalid pointer and the interpreter aborts. A single BOM prefixed document decoded with a throwing filter callback crashes any caller.

CWE-755

CWE-763

https://github.com/rurban/Cpanel-JSON-XS/commit/dfe1b41a36caba51dc12a2917fe50285d1ffaa7b.patch

https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.41/changes