5.3

CVE-2026-22261: Suricata eve/alert: http1 xff handling can lead to denial of service

Analyzed
AliasesUBUNTU-CVE-2026-22261DEBIAN-CVE-2026-22261
Published 27-01-2026Last modified 27-01-2026

Vulnerability summary

CVE-2026-22261 is a medium (CVSS 5.3) vulnerability in oisf suricata. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 29.1% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.36%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:10082-1

Timeline

  1. 27-01-2026
    PublishedVulnerability first disclosed.
  2. 27-01-2026
    Last modifiedVulnerability information updated.

Description

Suricata is a network IDS, IPS and NSM engine. Prior to versions 8.0.3 and 7.0.14, various inefficiencies in xff handling, especially for alerts not triggered in a tx, can lead to severe slowdowns. Versions 8.0.3 and 7.0.14 contain a patch. As a workaround, disable XFF support in the eve configuration. The setting is disabled by default.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.36%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.33% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • suricata< 1:7.0.10-1+deb13u3 | < 1:8.0.3-1
Oisf1 product
Ubuntu1 product
  • suricataAll versions (No fix recorded)

3 vendors · 3 products

References

7 links