CVE-2025-15578: Maypole versions from 2.10 through 2.13 for Perl generates session ids insecurely

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CRITICAL 9.8REMOTEUPGRADE

CVE-2025-15578 is a critical-severity flaw (CVSS 9.8) affecting maypole. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Maypole versions from 2.10 through 2.13 for Perl generates session ids insecurely. The session id is seeded with the system time (which is available from HTTP response headers), a call to the built-in rand() function, and the PID.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-338
Published	2026-02-16
Last modified	2026-06-17

Publisher (CNA): CPANSec · Vendor: teejay

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

Am I affected?

Timeline

2026-02-16 22:22 UTCPublished CVE record published
2026-06-17 08:38 UTCUpdated Record last modified

teejay maypole UPGRADE

Affected: >= 2.10 and <= 2.13 · 2.111 · 2.121

Fixed in: newer than 2.13

Safe to downgrade to: a release before 2.10

1. Check installed version

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

2. UPGRADE to newer than 2.13 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade maypole

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.10 (Debian / Ubuntu)

apt-cache madison maypole sudo apt install maypole=<VERSION_BEFORE_2.10> sudo apt-mark hold maypole

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list maypole sudo dnf downgrade maypole-<VERSION_BEFORE_2.10> sudo dnf versionlock add maypole

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-15578?

maypole: upgrade to newer than 2.13. Exact commands for each OS are on this page.

Is CVE-2025-15578 being exploited?

CVE-2025-15578 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-2025-15578 affect?

CVE-2025-15578 affects maypole. Severity is critical (CVSS 9.8). Maypole versions from 2.10 through 2.13 for Perl generates session ids insecurely. The session id is seeded with the system time (which is available from HTTP response headers), a call to the built-in rand() function, and the PID.

How urgent is CVE-2025-15578?

Priority 46/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

References

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