CVE-2026-94083: Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup code for the H

Q: How do I fix CVE-2026-94083?

suricata: upgrade to 8.0.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-94083 being exploited?

CVE-2026-94083 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-94083 affect?

CVE-2026-94083 affects suricata. Severity is critical (CVSS 9.4). Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup code for the HTTP2 state is executed even though the actual state is HTTP1 (when there is a DoH2 request with an HTTP1 to HTTP2 upgrade). This r

Q: How urgent is CVE-2026-94083?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.4REMOTEUPGRADE

CVE-2026-94083 is a critical-severity flaw (CVSS 9.4) affecting suricata. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup code for the HTTP2 state is executed even though the actual state is HTTP1 (when there is a DoH2 request with an HTTP1 to HTTP2 upgrade). This requires app-layer.protocols.doh2 to be enabled, which is the default in 8.x versions.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.4 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-843
Published	2026-09-20
Last modified	2026-09-28

Publisher (CNA): MITRE · Vendor: oisf

Last updated 2026-09-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-20 02:16 UTCPublished CVE record published
2026-09-28 18:30 UTCUpdated Record last modified

oisf suricata UPGRADE

Affected: < 8.0.7

Fixed in: 8.0.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy suricata || rpm -q suricata || suricata --version

2. UPGRADE to 8.0.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade suricata

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade suricata

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-94083?

suricata: upgrade to 8.0.7. Exact commands for each OS are on this page.

Is CVE-2026-94083 being exploited?

CVE-2026-94083 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-94083 affect?

CVE-2026-94083 affects suricata. Severity is critical (CVSS 9.4). Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup code for the HTTP2 state is executed even though the actual state is HTTP1 (when there is a DoH2 request with an HTTP1 to HTTP2 upgrade). This r

How urgent is CVE-2026-94083?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Suricata and Snort vulnerabilities

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References

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