CVE-2026-45770: suricata Memory Corruption — Fix

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Starting in version 8.0.0 and prior to version 8.0.5, a Lua rule that registers too many flow variables can corrupt Lua detection state and may bypass Suricata's restricted Lua sandbox. This requires an affected Lua script/rule to be loaded. Excessive flow variables being registered may also cause Suricata to crash. Version 8.0.5 contains a fix. As a workaround, disable `security.lua.allow-rules` unless Lua rules are required.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploit Prediction

0.0036

Probability of exploitation

0.30%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-693 CWE-693

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
oisf	suricata	8.0.0 — 8.0.5

References

Advisories & Patches

https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315

Other References

https://github.com/OISF/suricata/security/advisories/GHSA-653j-cc95-vj4c https://redmine.openinfosecfoundation.org/issues/8556

Frequently Asked Questions

What is CVE-2026-45770? +

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Starting in version 8.0.0 and prior to version 8.0.5, a Lua rule that registers too many flow variables can corrupt Lua detection state and may bypass Suricata's restricted Lua sandbox. This requires an affected Lua script/rule to be loaded. Excessive flow variables being registered may also cause Suricata to crash. Version 8.0.5 contains a fix. As a workaround, disable `security.lua.allow-rules` unless Lua rules are required. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-45770? +

CVE-2026-45770 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0036, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-45770? +

CVE-2026-45770 affects products from oisf, specifically: suricata. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-45770? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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