CVE-2026-45765

Suricata dnp3: unbounded reassembly can lead to resource exhaustion

Published Sep 10, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, DNP3 reassembly could buffer data without sufficient parser-level bounds. Crafted DNP3 traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable DNP3 (which is not enabled by default) if it is not needed, and/or define a limited `stream.reassembly.depth` (0 or absent is unlimited).

Analysis

Technical impact

Suricata’s DNP3 packet reassembly routine allocates memory without limiting the data size it can buffer, leading to uncontrolled memory consumption. An attacker who can generate malicious DNP3 traffic can trigger this flaw, exhausting available system memory and causing the Suricata process to become unresponsive or crash. The weakness is an uncontrolled resource consumption vulnerability.

Affected Systems

All installations of Suricata older than version 7.0.16 or 8.0.5 are affected. These releases include the unbounded reassembly logic; the issue is resolved only in the listed patched versions.

Risk and Exploitability

The CVSS score of 7.5 denotes a high severity. The EPSS score is less than 1%, indicating a low probability of exploitation at present, and the flaw is not in the CISA KEV catalog. Nonetheless, the attack requires only remotely crafted DNP3 traffic, and any deployment with DNP3 enabled or a high reassembly depth could be vulnerable to a denial‑of‑service attack.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

OISF

suricata

affected

Version	Status	Constraints
`>= 8.0.0, < 8.0.5`	affected	—
`< 7.0.16`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:oisf:suricata::::::::
	cpe:2.3:a:oisf:suricata::::::::

No data.

Vendor Product Versions

Oisf

Suricata

Version	Status	Scheme	Platform
`[8.0.0,8.0.5)`	affected	semver	—
`[0,7.0.16)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade Suricata to version 7.0.16 or 8.0.5 to apply the fix for the DNP3 reassembly bug.
Disable DNP3 processing in Suricata if it is not required for your environment.
Configure a limited stream.reassembly.depth (e.g., set to 0) to restrict memory usage if DNP3 must remain enabled.

Generated by OpenCVE AI on September 21, 2026 at 06:46 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.616% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315
https://github.com/OISF/suricata/security/advisories/GHSA-m8x4-c78g-r4vj
https://nvd.nist.gov/vuln/detail/CVE-2026-45765
https://redmine.openinfosecfoundation.org/issues/8460
https://www.cve.org/CVERecord?id=CVE-2026-45765

History

Sep 16, 2026 8:30 PM Affected versions updated View changes

Type	Values Removed	Values Added
CPEs		cpe:2.3:a:oisf:suricata::::::::

Sep 16, 2026 12:15 AM Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-1284
References		https://nvd.nist.gov/vuln/detail/CVE-2026-45765 https://www.cve.org/CVERecord?id=CVE-2026-45765
Metrics	threat_severity `None`	threat_severity `Important`

Sep 12, 2026 12:15 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 11, 2026 7:00 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Oisf Oisf suricata
Vendors & Products		Oisf Oisf suricata

Sep 10, 2026 9:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, DNP3 reassembly could buffer data without sufficient parser-level bounds. Crafted DNP3 traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable DNP3 (which is not enabled by default) if it is not needed, and/or define a limited `stream.reassembly.depth` (0 or absent is unlimited).
Title		Suricata dnp3: unbounded reassembly can lead to resource exhaustion
Weaknesses		CWE-400 CWE-770
References		https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 https://github.com/OISF/suricata/security/advisories/GHSA-m8x4-c78g-r4vj https://redmine.openinfosecfoundation.org/issues/8460
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`