What is the CVSS score of CVE-2025-40926?

CVE-2025-40926 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Suse are affected by CVE-2025-40926?

CVE-2025-40926 is a critical vulnerability in Plack that could allow attackers to gain unauthorized system access with a 9.8 CVSS severity rating.. A patch is available.

How to fix or mitigate CVE-2025-40926?

Within 24 hours: Identify all systems running Plack and document current versions in use. Within 7 days: Test and deploy the available vendor patch in a staging environment to validate compatibility with dependent applications. Within 30 days: Complete production rollout of patches across all affected systems and verify successful deployment.

Suse CVE-2025-40926

CRITICAL

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) (CWE-338)

2026-03-05 9b29abf9-4ab0-4765-b253-1875cd9b441e

Information Disclosure Suse

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SUSE

CRITICAL

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

Patch released

Mar 12, 2026 - 00:16 nvd

Patch available

CVE Published

Mar 05, 2026 - 02:16 nvd

CRITICAL 9.8

DescriptionCVE.org

Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely.

The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.

Predictable session ids could allow an attacker to gain access to systems.

Plack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923.