CVE-2026-5081: Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure. Apa

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CRITICAL 9.1REMOTEWATCHLISTUPGRADE

CVE-2026-5081 is a critical-severity flaw (CVSS 9.1) affecting apache\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure. Apache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session id. The UNIQUE_ID variable is set by the Apache mod_unique_id plugin, which generates unique ids for the request. The id is based on the IPv4 address, the process id, the epoch time, a 16-bit counter and a threa

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-340, CWE-341
Published	2026-05-06
Last modified	2026-10-26

Publisher (CNA): CPANSec · Vendor: chorny

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-06 13:16 UTCPublished CVE record published
2026-10-26 19:10 UTCUpdated Record last modified

chorny apache\ UPGRADE

Affected: >= 1.54 and <= 1.94

Fixed in: newer than 1.94

Safe to downgrade to: a release before 1.54

1. Check installed version

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

2. UPGRADE to newer than 1.94 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apache

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 1.54 (Debian / Ubuntu)

apt-cache madison apache sudo apt install apache=<VERSION_BEFORE_1.54> sudo apt-mark hold apache

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

dnf --showduplicates list apache sudo dnf downgrade apache-<VERSION_BEFORE_1.54> sudo dnf versionlock add apache

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-2026-5081?

apache\: upgrade to newer than 1.94. Exact commands for each OS are on this page.

Is CVE-2026-5081 being exploited?

CVE-2026-5081 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-2026-5081 affect?

CVE-2026-5081 affects apache\. Severity is critical (CVSS 9.1). Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure. Apache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session i

How urgent is CVE-2026-5081?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Perl vulnerabilities

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References

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