CVE-2026-9516 Affecting perl-Cpanel-JSON-XS-debugsource package, versions <0:4.25-2.amzn2023.0.9


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.62% (48th percentile)

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  • Snyk IDSNYK-AMZN2023-PERLCPANELJSONXSDEBUGSOURCE-17414224
  • published23 Jun 2026
  • disclosed3 Jun 2026

Introduced: 3 Jun 2026

CVE-2026-9516  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 perl-Cpanel-JSON-XS-debugsource to version 0:4.25-2.amzn2023.0.9 or higher.
This issue was patched in ALAS2023-2026-1829.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perl-Cpanel-JSON-XS-debugsource package and not the perl-Cpanel-JSON-XS-debugsource package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1