CVE-2026-8503
Undergoing Analysis
Undergoing Analysis - In Progress
BaseFortify
Vulnerability report for CVE-2026-8503, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-05-15
Last updated on: 2026-05-18
Assigner: CPANSec
Description
Description
Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids.
Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems.
Note that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module.
This issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| guimard | apache | to 1.3.19 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-340 | The product uses a scheme that generates numbers or identifiers that are more predictable than required. |
| CWE-338 | The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong. |
