CVE-2026-3256

CRITICAL EPSS 40.8%
Published Mar 28, 20263mo ago · Modified Jun 29, 20262d ago
9.8 CVSS 3.1
Critical
Find Similar
Published Mar 28, 2026 3mo ago
Last Modified Jun 29, 2026 2d ago

Description

HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids. HTTP::Session defaults to using HTTP::Session::ID::SHA1 to generate session ids using a SHA-1 hash seeded with the built-in rand function, the high resolution 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. The distribution includes HTTP::session::ID::MD5 which contains a similar flaw, but uses the MD5 hash instead.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
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

Threat Intelligence

EPSS Exploit Probability
40.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-338
CWE-340

Affected Products 1

VendorProductVersionRange
ktathttp\\ ≤0.53

References 5

  • openwall.com http://www.openwall.com/lists/oss-security/2026/03/28/5
    Mailing ListThird Party Advisory
  • metacpan.org https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pm
    Product
  • metacpan.org https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pm
    Product
  • metacpan.org https://metacpan.org/release/TOKUHIROM/http-session-0.54/changes
  • security.metacpan.org https://security.metacpan.org/docs/guides/random-data-for-security.html
    Third Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.