CVE-2026-56016
Description
A flaw was found in perl-CGI-Session. This vulnerability allows a remote attacker to predict session identifiers due to the use of low-entropy sources in the generate_id method. By predicting a session identifier, an attacker can impersonate a user's session, leading to a bypass of authentication mechanisms and potential unauthorized access to sensitive information or functionality.
Statement
This Important flaw in perl-CGI-Session allows a remote attacker to bypass authentication by predicting session identifiers. The CGI::Session::ID::md5 module generates session IDs using low-entropy sources, including process ID, epoch time, and a predictable random number generator. This predictability enables an attacker to impersonate a user's session, potentially leading to unauthorized access in web applications utilizing this module for session management.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.4 | N/A | 5.9 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | None |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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