CVE-2026-5082: Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id. Th

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-5082 is a medium-severity flaw (CVSS 5.3) affecting amon2\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id. The generate_session_id function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes using SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not l

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-338, CWE-340
Published	2026-04-08
Last modified	2026-07-24

Publisher (CNA): CPANSec · Vendor: tokuhirom

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 06:16 UTCPublished CVE record published
2026-07-24 20:10 UTCUpdated Record last modified

tokuhirom amon2\ UPGRADE

Affected: >= 7.00 and <= 7.03

Fixed in: newer than 7.03

Safe to downgrade to: a release before 7.00

1. Check installed version

apt-cache policy amon2 || rpm -q amon2 || amon2 --version

2. UPGRADE to newer than 7.03 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade amon2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade amon2

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 7.00 (Debian / Ubuntu)

apt-cache madison amon2 sudo apt install amon2=<VERSION_BEFORE_7.00> sudo apt-mark hold amon2

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

dnf --showduplicates list amon2 sudo dnf downgrade amon2-<VERSION_BEFORE_7.00> sudo dnf versionlock add amon2

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-2026-5082?

amon2\: upgrade to newer than 7.03. Exact commands for each OS are on this page.

Is CVE-2026-5082 being exploited?

CVE-2026-5082 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-2026-5082 affect?

CVE-2026-5082 affects amon2\. Severity is medium (CVSS 5.3). Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id. The generate_session_id function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generat

How urgent is CVE-2026-5082?

Priority 32/100. Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

References

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