What’s Vulnerable › Vulnerabilities

CVE-2025-29917: Suricata decode_base64: signature can do large memory allocation

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-10 · updated 2026-06-17
• Weakness: CWE-770

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. The bytes setting in the decode_base64 keyword is not properly limited. Due to this, signatures using the keyword and setting can cause large memory allocations of up to 4 GiB per thread. This vulnerability is fixed in 7.0.9.

Affected products

• OISF suricata: before 7.0.9 — fixed in 7.0.9

How to fix

Upgrade to a fixed version: OISF suricata 7.0.9. Check the vendor advisory for mitigations.

References

• https://github.com/OISF/suricata/commit/32d0bd2bbb4d486623dec85a94952fde2515f2f0
• https://github.com/OISF/suricata/security/advisories/GHSA-x8c9-8553-j9px
• https://redmine.openinfosecfoundation.org/issues/7613

Get alerted when CVE-2025-29917 or the next vulnerability affects your stack