OISF Suricata up to 8.0.3 MIME Encoded Message algorithmic complexity

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in OISF Suricata up to 8.0.3. This affects an unknown part of the component MIME Encoded Message Handler. Such manipulation leads to algorithmic complexity. This vulnerability is traded as CVE-2026-31934. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in OISF Suricata up to 8.0.3 and classified as problematic. Affected by this issue is an unknown code block of the component MIME Encoded Message Handler. The manipulation with an unknown input leads to a algorithmic complexity vulnerability. Using CWE to declare the problem leads to CWE-407. An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached. Impacted is availability. CVE summarizes:

Suricata is a network IDS, IPS and NSM engine. From version 8.0.0 to before version 8.0.4, there is a quadratic complexity issue when searching for URLs in mime encoded messages over SMTP leading to a performance impact. This issue has been patched in version 8.0.4.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-31934 since 03/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 304890 (Linux Distros Unpatched Vulnerability : CVE-2026-31934), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.0.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (304890). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Algorithmic complexity
CWE: CWE-407 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 304890
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31934

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Suricata 8.0.4

Timelineinfo

03/10/2026 CVE reserved
04/02/2026 +22 days Advisory disclosed
04/02/2026 +0 days VulDB entry created
04/05/2026 +3 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-31934 (🔒)
GCVE (CVE): GCVE-0-2026-31934
GCVE (VulDB): GCVE-100-354884

Entryinfo

Created: 04/02/2026 17:00
Updated: 04/05/2026 10:30
Changes: 04/02/2026 17:00 (64), 04/05/2026 10:30 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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