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Fencer Vulns
high 8.1

CVE-2023-31484 json

CPAN.pm before 2.35 does not verify TLS certificates when downloading distributions over HTTPS.

published 2023-04-28 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-35789

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

CPAN.pm before 2.35 does not verify TLS certificates when downloading distributions over HTTPS.

Patch / fix

  • cpanpm_project cpanpm 2.35
  • perl Debian 12 5.36.0-7+deb12u3
  • perl Debian 14, Debian 13 5.38.2-2

debian advisories DEBIAN-CVE-2023-31484

  • perl Ubuntu 18.04 LTS 5.26.1-6ubuntu0.7
  • perl Ubuntu 20.04 LTS 5.30.0-9ubuntu0.4
  • perl Ubuntu 22.04 LTS 5.34.0-3ubuntu1.2
  • perl Ubuntu Pro 14.04 LTS 5.18.2-2ubuntu1.7+esm5
  • perl Ubuntu Pro 16.04 LTS 5.22.1-9ubuntu0.9+esm2

ubuntu advisories UBUNTU-CVE-2023-31484

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl hummingbird 1 5.42.2-524.1.hum1
  • perl-B hummingbird 1 1.89-524.1.hum1
  • perl-if hummingbird 1 0.61.000-524.1.hum1
  • perl-IO hummingbird 1 1.55-524.1.hum1
  • perl-ph hummingbird 1 5.42.2-524.1.hum1
  • perl-lib hummingbird 1 0.65-524.1.hum1
  • perl-mro hummingbird 1 1.29-524.1.hum1
  • perl-Net hummingbird 1 1.04-524.1.hum1

red hat advisories RHSA-2026:7604RHSA-2026:0079RHSA-2024:3094RHSA-2023:6539

  • perl SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Real Time 15 SP3 +19 more 5.26.1-150300.17.14.1
  • perl SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 5.18.2-12.26.1
  • perl SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS 5.26.1-150000.7.18.1

suse advisories SUSE-SU-2024:1630-1SUSE-SU-2023:2882-1SUSE-SU-2023:2881-1

  • perl-CPAN AlmaLinux 8 2.18-399.el8
  • perl-CPAN AlmaLinux 9 2.29-3.el9

almalinux advisories ALSA-2024:3094ALSA-2023:6539

  • perl-CPAN Rocky Linux 8 2.18-399.el8
  • perl-CPAN Rocky Linux 9 2.29-3.el9

rocky linux advisories RLSA-2024:3094RLSA-2023:6539

  • perl CBL-Mariner 2.0 5.34.1-489

azure linux advisories AZL-37126

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-31484 updated cvss 7.4

perl: CPAN.pm does not verify TLS certificates when downloading distributions over HTTPS

  • Red Hat Enterprise Linux 6 perl, perl-CGI, perl-core, perl-CPAN, perl-libs, perl-parent, +39 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) perl-CPAN 2.18-399.el8
    fixed: vendor fix RHSA-2024:3094
  • Red Hat Enterprise Linux AppStream (v. 9) perl-CPAN 2.29-3.el9
    fixed: vendor fix RHSA-2023:6539
  • Red Hat Enterprise Linux Server (v. 7 ELS) perl 5.16.3-299.el7_9.1, perl-core 5.16.3-299.el7_9.1, perl-CPAN 1.9800-299.el7_9.1, perl-libs 5.16.3-299.el7_9.1, perl-IO-Zlib 1.10-299.el7_9.1, perl-macros 5.16.3-299.el7_9.1, +10 more Red Hat Enterprise Linux Server Optional (v. 7 ELS) perl-tests 5.16.3-299.el7_9.1
    fixed: vendor fix RHSA-2026:0079
  • Red Hat Hardened Images perl 5.42.2-524.1.hum1, perl-B 1.89-524.1.hum1, perl-IO 1.55-524.1.hum1, perl-Tie 4.6-524.1.hum1, perl-lib 0.65-524.1.hum1, perl-mro 1.29-524.1.hum1, +93 more
    fixed: vendor fix RHSA-2026:7604

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

1.55% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/andk/cpanpm/pull/175 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • cpanpm_project cpanpm

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.