VDB

CVE-2025-40929

CVE-2025-40929 PUBLISHED CVSS 5.6 MEDIUM

Reported by cpansec · Published September 8, 2025

Cpanel::JSON::XS before version 4.40 for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

PackageEcosystemFixed in
perl-cpanel-json-xsAlpine4.40-r0
Cpanel-JSON-XScpan.org4.40
perl-Cpanel-JSON-XSAmazon Linux4.25-2.amzn2023.0.7

Risk scores

CVSS 3.1
5.6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

VendorProductVersions
RURBANCpanel::JSON::XS0
alpineperl-cpanel-json-xs0
RURBANCpanel::JSON::XS0
amazon:2023perl-Cpanel-JSON-XS0

Timeline

  • Sep 8, 2025 CVE Published
  • Sep 8, 2025 PoC Published (6 in total, the first dated here)
  • Sep 9, 2025 EPSS Score (30 in total, the first dated here)
  • Nov 4, 2025 CVE Updated
  • Apr 2, 2026 Security Advisory (2 in total, the first dated here)
  • Jun 8, 2026 Coalition ESS Score

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln CVE-2025-40929
vulnetix vdb fixes CVE-2025-40929

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/CVE-2025-40929/fixes/registry"

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References

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