CVE-2025-29918: Suricata pcre: negated pcr can cause infinite loop

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-835

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. A PCRE rule can be written that leads to an infinite loop when negated PCRE is used. Packet processing thread becomes stuck in infinite loop limiting visibility and availability in inline mode. 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/b14c67cbdf25fa6c7ffe0d04ddf3ebe67b12b50b
https://github.com/OISF/suricata/security/advisories/GHSA-924c-vvm5-9mqx
https://redmine.openinfosecfoundation.org/issues/7526
https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html

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