Suricata is a widely deployed network IDS/IPS; default DoH2 setting is affected. Exploitation can disrupt or compromise detection infrastructure across organizations.
CVE-2026-94083
Suricata DoH2 type-confusion allows crash or potential RCE via HTTP1->HTTP2 upgrade
Is CVE-2026-94083 being exploited?
Not confirmed. CVE-2026-94083 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-94083?
CVE-2026-94083 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-94083?
Yes. A fix has been recorded for CVE-2026-94083. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-94083 affect?
CVE-2026-94083 affects OISF Suricata < 8.0.7, Suricata 8.x with app-layer.protocols.doh2 enabled, IDS/IPS appliances embedding Suricata. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-94083?
Upgrade to Suricata 8.0.7+ or disable app-layer.protocols.doh2 until patched
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote memory corruption via crafted DoH2 (HTTP1->HTTP2 upgrade) can crash Suricata (DoS) or enable arbitrary code execution.
Immediate action required
- affected>= 8.0.0 and < 8.0.7
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.