OISF Suricata up to 8.0.3 tls.alpn null pointer dereference

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

Summaryinfo

A vulnerability was found in OISF Suricata up to 8.0.3 and classified as problematic. Impacted is an unknown function. The manipulation of the argument tls.alpn results in null pointer dereference. This vulnerability is identified as CVE-2026-31931. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OISF Suricata up to 8.0.3. It has been classified as problematic. Affected is an unknown code. The manipulation of the argument tls.alpn with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

Suricata is a network IDS, IPS and NSM engine. From version 8.0.0 to before version 8.0.4, use of the "tls.alpn" rule keyword can cause Suricata to crash with a NULL dereference. This issue has been patched in version 8.0.4.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-31931 since 03/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 304877 (Linux Distros Unpatched Vulnerability : CVE-2026-31931), 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 (304877). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

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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

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

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / 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: 304877
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31931

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: 8294
Status: Confirmed

CVE: CVE-2026-31931 (🔒)
GCVE (CVE): GCVE-0-2026-31931
GCVE (VulDB): GCVE-100-354876

Entryinfo

Created: 04/02/2026 16:57
Updated: 04/05/2026 14:19
Changes: 04/02/2026 16:57 (65), 04/05/2026 14:19 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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