CVE-2026-8503: CWE-340 Generation of Predictable Numbers or Identifiers in GUIMARD Apache::Session::Generate::SHA256
CVE-2026-8503 affects Apache::Session::Generate::SHA256 versions before 1. 3. 19 for Perl, where session IDs are generated using predictable, low-entropy sources such as the built-in rand() function, epoch time, and process ID. This insecure method can lead to predictable session identifiers, potentially allowing attackers to gain unauthorized access. Although version 1. 3. 19 introduces a fallback to a more secure method, it may revert to the insecure method if Crypt::URandom::urandom fails, which is unlikely due to the module's requirements. No official patch or remediation has been confirmed yet.
AI Analysis
Technical Summary
The vulnerability in Apache::Session::Generate::SHA256 prior to version 1.3.19 arises from the generation of session IDs using predictable inputs: the built-in rand() function, epoch time, and PID, which are hashed with SHA-256. These sources provide low entropy, making session IDs guessable. Version 1.3.19 attempts to mitigate this by using Crypt::URandom::urandom for randomness, but falls back silently to the insecure method if that fails. This vulnerability is categorized under CWE-340 (Generation of Predictable Numbers or Identifiers) and CWE-338 (Use of Cryptographically Weak Pseudo-Random Number Generator). No CVSS score or official patch is currently documented.
Potential Impact
The primary impact is the potential for attackers to predict session IDs, which could lead to unauthorized access to user sessions or systems relying on these session identifiers for authentication or state management. There are no known exploits in the wild at this time. The fallback to insecure generation in version 1.3.19 could still pose a risk if the secure randomness source fails, although this is unlikely.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should upgrade to version 1.3.19 or later where the module attempts to use Crypt::URandom::urandom for session ID generation. Additionally, verify that the Crypt::URandom dependency is properly installed and functioning to avoid fallback to insecure generation. Monitor vendor communications for any official fixes or updates.
CVE-2026-8503: CWE-340 Generation of Predictable Numbers or Identifiers in GUIMARD Apache::Session::Generate::SHA256
Description
CVE-2026-8503 affects Apache::Session::Generate::SHA256 versions before 1. 3. 19 for Perl, where session IDs are generated using predictable, low-entropy sources such as the built-in rand() function, epoch time, and process ID. This insecure method can lead to predictable session identifiers, potentially allowing attackers to gain unauthorized access. Although version 1. 3. 19 introduces a fallback to a more secure method, it may revert to the insecure method if Crypt::URandom::urandom fails, which is unlikely due to the module's requirements. No official patch or remediation has been confirmed yet.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Apache::Session::Generate::SHA256 prior to version 1.3.19 arises from the generation of session IDs using predictable inputs: the built-in rand() function, epoch time, and PID, which are hashed with SHA-256. These sources provide low entropy, making session IDs guessable. Version 1.3.19 attempts to mitigate this by using Crypt::URandom::urandom for randomness, but falls back silently to the insecure method if that fails. This vulnerability is categorized under CWE-340 (Generation of Predictable Numbers or Identifiers) and CWE-338 (Use of Cryptographically Weak Pseudo-Random Number Generator). No CVSS score or official patch is currently documented.
Potential Impact
The primary impact is the potential for attackers to predict session IDs, which could lead to unauthorized access to user sessions or systems relying on these session identifiers for authentication or state management. There are no known exploits in the wild at this time. The fallback to insecure generation in version 1.3.19 could still pose a risk if the secure randomness source fails, although this is unlikely.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should upgrade to version 1.3.19 or later where the module attempts to use Crypt::URandom::urandom for session ID generation. Additionally, verify that the Crypt::URandom dependency is properly installed and functioning to avoid fallback to insecure generation. Monitor vendor communications for any official fixes or updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CPANSec
- Date Reserved
- 2026-05-13T21:07:03.760Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a070551ec166c07b034bb2c
Added to database: 5/15/2026, 11:36:49 AM
Last enriched: 5/15/2026, 11:51:45 AM
Last updated: 5/15/2026, 12:42:13 PM
Views: 4
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