CVE-2023-31484: CPAN.pm before 2.35 does not verify TLS certificates when downloading distributions over HTTPS.

Q: How do I fix CVE-2023-31484?

cpanpm: upgrade to 2.35; perl: upgrade to 5.38.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-31484 being exploited?

CVE-2023-31484 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-31484 affect?

CVE-2023-31484 affects cpanpm, perl. Severity is high (CVSS 8.1). CPAN.pm before 2.35 does not verify TLS certificates when downloading distributions over HTTPS.

Q: How urgent is CVE-2023-31484?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.1REMOTEUPGRADEUPGRADE

CVE-2023-31484 is a high-severity flaw (CVSS 8.1) affecting cpanpm, perl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-295
Published	2023-04-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cpanpm project · perl

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-29 00:15 UTCPublished CVE record published
2026-06-17 05:57 UTCUpdated Record last modified

cpanpm project cpanpm UPGRADE

Affected: < 2.35

Fixed in: 2.35

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cpanpm || rpm -q cpanpm || cpanpm --version

2. UPGRADE to 2.35 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cpanpm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cpanpm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

perl perl UPGRADE

Affected: < 5.38.0

Fixed in: 5.38.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy perl || rpm -q perl || perl --version

2. UPGRADE to 5.38.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade perl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade perl

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-31484?

cpanpm: upgrade to 2.35; perl: upgrade to 5.38.0. Exact commands for each OS are on this page.

Is CVE-2023-31484 being exploited?

CVE-2023-31484 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-31484 affect?

CVE-2023-31484 affects cpanpm, perl. Severity is high (CVSS 8.1). CPAN.pm before 2.35 does not verify TLS certificates when downloading distributions over HTTPS.

How urgent is CVE-2023-31484?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

References

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