Dancer::Session::Abstract versions through 1.3522 for Perl generates session ids insecurely

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-5080
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-30 12:16:24 UTC
Updated2026-05-05 02:54:42 UTC
DescriptionDancer::Session::Abstract versions through 1.3522 for Perl generates session ids insecurely. The session id is generated from summing the character codepoints of the absolute pathname with the process id, the epoch time and calls to the built-in rand() function to return a number between 0 and 999-billion, and concatenating that result three times. The path name might be known or guessed by an attacker, especially for applications known to be written using Dancer with standard installation locations. The epoch time can be guessed by an attacker, and may be leaked in the HTTP header. The process id comes from a small set of numbers, and workers may have sequential process ids. The built-in rand() function is seeded with 32-bits and is considered unsuitable for security applications. Predictable session ids could allow an attacker to gain access to systems.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from ADP

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

EPSS: 0.000380000 probability, percentile 0.110920000 (date 2026-05-04)

Problem Types: CWE-338 | CWE-340 | CWE-340 CWE-340 Generation of Predictable Numbers or Identifiers | CWE-338 CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Perldancer Dancer \ session\ \ abstract

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA BIGPRESH DancerSessionAbstract affected 1.3522 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/BIGPRESH/Dancer-1.3522/source/lib/Dancer/Session/Abst... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Product
security.metacpan.org/patches/D/Dancer/1.3522/CVE-2026-5080-r1.patch 9b29abf9-4ab0-4765-b253-1875cd9b441e security.metacpan.org Patch
www.openwall.com/lists/oss-security/2026/04/30/19 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Workarounds

CNA: Apply the linked patch.

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