CVE-2025-40905: WWW::OAuth 1.000 and earlier for Perl uses the rand() function as the default source of entropy, which is not

Q: How do I fix CVE-2025-40905?

www\: upgrade to newer than 1.000. Exact commands for each OS are on this page.

Q: Is CVE-2025-40905 being exploited?

CVE-2025-40905 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-2025-40905 affect?

CVE-2025-40905 affects www\. Severity is high (CVSS 7.3). WWW::OAuth 1.000 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.

Q: How urgent is CVE-2025-40905?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.3REMOTEUPGRADE

CVE-2025-40905 is a high-severity flaw (CVSS 7.3) affecting www\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WWW::OAuth 1.000 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-338
Published	2026-02-13
Last modified	2026-06-17

Publisher (CNA): CPANSec · Vendor: dbook

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

Am I affected?

Timeline

2026-02-13 00:16 UTCPublished CVE record published
2026-06-17 09:22 UTCUpdated Record last modified

dbook www\ UPGRADE

Affected: <= 1.000

Fixed in: newer than 1.000

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.000 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade www

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-2025-40905?

www\: upgrade to newer than 1.000. Exact commands for each OS are on this page.

Is CVE-2025-40905 being exploited?

CVE-2025-40905 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-2025-40905 affect?

CVE-2025-40905 affects www\. Severity is high (CVSS 7.3). WWW::OAuth 1.000 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.

How urgent is CVE-2025-40905?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

Related CVEs

CVE-2026-8612 MEDIUM 5.3 UPGRADE WWW::Mechanize::Cached versions before 2.00 for Perl deserialize cached HTTP responses from a world-writable o

References

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