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Fencer Vulns
high 7.5

CVE-2026-31931 json

Suricata tls: null dereference in tls.alpn rule keyword

published 2026-04-02 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-18237

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

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.

Patch / fix

  • oisf suricata 8.0.4
  • openinfosecfoundation suricata 8.0.4
  • suricata-ids suricata 8.0.4
  • suricata Debian 14 1:8.0.4-1

debian advisories DEBIAN-CVE-2026-31931

  • suricata openSUSE Tumbleweed 8.0.4-1.1

opensuse advisories openSUSE-SU-2026:10443-1

  • suricata Alpine 3.24 8.0.6-r0

alpine advisories ALPINE-CVE-2026-31931

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-31931 updated cvss 7.5

Suricata: Suricata: Denial of Service via 'tls.alpn' rule keyword

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • OISF suricata

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.