Read the docs
TI-2025-27314 Aliases CVE-2025-40923GHSA-868p-jhqw-wrgr

Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely

Priority LOW 32CWE-338Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

Plack-Middleware-Session before version 0.35 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. Predicable session ids could allow an attacker to gain access to systems.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0039 33rd percentileScored 2026-11-07
Fix Fixed Plack::Middleware::Session (MIYAGAWA): 0.35

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MIYAGAWAPlack::Middleware::Session0.01 to before 0.350.35Patch availableCNA
  • Plack::Middleware::Session VendorMIYAGAWA Affected 0.01 to before 0.35 Fixed in 0.35 Patch available CNA

Remediation

  • Fix · CNA Plack::Middleware::Session (MIYAGAWA) Fixed in 0.35

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-40923
  2. 2026-10-03 Alias added: GHSA-868p-jhqw-wrgr

References

Patch 1

Other 3

  • TI-2014-08412 Plack::Middleware::Session::Cookie versions through 0.21 for Perl allows remote code… CVSS 3.1CRITICAL 9.8
  • TI-2026-06484 Information disclosure in MIYAGAWA Plack::Middleware::XSendfile CVSS 3.1CRITICAL 9.1
  • TI-2026-29301 Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header… CVSS 3.1HIGH 7.5
  • TI-2013-06174 Plack::Middleware::Session versions before 0.17 for Perl may be vulnerable to HMAC comparison timing attacks CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences