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detect: frame rules without content and with transform can cause heap buffer overflow during rule load

Low
jasonish published GHSA-6qwq-j83r-qp34 Jul 21, 2026

Software

Suricata

Affected versions

>= 8.0.0, < 8.0.6

Patched versions

8.0.6

Description

Impact

A crafted Suricata rule that combines a frame match without content and transformed without content matching can trigger a heap buffer overflow while signatures are being prepared for non-prefilter inspection. The issue is reached during rule parsing/loading, including test mode, rather than by network traffic alone.

Patches

Upgrade to Suricata 8.0.6.

Workarounds

Only load trusted rulesets. Avoid rules that combine frame inspection with both direct and transformed without content matches until upgraded.

References

https://redmine.openinfosecfoundation.org/issues/8590

Credits

OSS-Fuzz.

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVE ID

CVE-2026-63451

Weaknesses

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Learn more on MITRE.