CVE-2026-22263

Suricata http1: quadratic complexity in headers parsing over multiple packets

5.3 MediumFix available

Suricata is a network IDS, IPS and NSM engine. Starting in version 8.0.0 and prior to version 8.0.3, inefficiency in http1 headers parsing can lead to slowdown over multiple packets. Version 8.0.3 patches the issue. No known workarounds are available.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.45%Up 0.4 points since Jan 28, 2026

What each source reports

CVE List Score used 5.3

Suricata http1: quadratic complexity in headers parsing over multiple packets

Record: CVE-2026-22263
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-1050
Updated: 2026-11-02

EUVDEUVD-2026-4771 5.3

Record: EUVD-2026-4771
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

NVD 5.3

Record: CVE-2026-22263
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-1050
Updated: 2026-11-02

OSV 5.3

Suricata http1: quadratic complexity in headers parsing over multiple packets

Record: CVE-2026-22263
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-1050
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-22263 5.3

Record: DEBIAN-CVE-2026-22263
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-22263 5.3

Record: UBUNTU-CVE-2026-22263
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

OSVopenSUSE-SU-2026:10082-1 No score

libsuricata8_0_3-8.0.3-1.1 on GA media

These are all security issues fixed in the libsuricata8_0_3-8.0.3-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:10082-1
Updated: 2026-11-02

Affected products

oisf suricata

Affected packages

Affected packages
Package	Affected	Fixed
`suricata` Debian:14	before 1:8.0.3-1, plus listed versions 1:7.0.10-11:7.0.11-11:7.0.11-1~bpo13+11:8.0.0-1~exp11:8.0.0-1~exp2 Show 9 moreShow less 1:8.0.0-1~exp41:8.0.0-1~exp51:8.0.1-11:8.0.1-21:8.0.1-31:8.0.1-3~bpo13+11:8.0.2-11:8.0.2-1~bpo13+11:8.0.3-1~bpo13+1	1:8.0.3-1
`suricata` Ubuntu:16.04:LTS	All versions, plus listed versions 2.0.8-1build12.0.9-12.0.10-12.0.10-22.0.11-13.0-1	None known
`suricata` Ubuntu:18.04:LTS	All versions, plus listed versions 3.2-2ubuntu3	None known
`suricata` Ubuntu:22.04:LTS	All versions, plus listed versions 1:6.0.4-21:6.0.4-3	None known
`suricata` Ubuntu:24.04:LTS	All versions, plus listed versions 1:7.0.0-21:7.0.2-11:7.0.2-1build11:7.0.3-1build11:7.0.3-1build3	None known
`suricata` Ubuntu:25.10	All versions, plus listed versions 1:7.0.8-21:7.0.10-1	None known
`suricata` openSUSE:Tumbleweed From an advisory covering 14 CVEs	before 8.0.3-1.1	8.0.3-1.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-22263 is a medium vulnerability (CVSS 5.3) in Oisf Suricata, published January 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 38th percentile. Fixed in suricata 1:8.0.3-1.

References

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