7.5

CVE-2026-93567: netty Improper Input Validation

CVSS: 7.5v3.1HighAwaiting analysis
AliasesUBUNTU-CVE-2026-93567DEBIAN-CVE-2026-93567
Published 18-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-93567 is a high (CVSS 7.5) Improper Input Validation vulnerability in netty. EPSS estimates a 2.56% chance of exploitation in the next 30 days, higher than 84.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
2.56%
0%100%
Low · +2.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:11882-1SUSE-SU-2026:4391-1

Timeline

  1. 18-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

2.56%

Chance of exploitation in the next 30 days

Percentile

85%

Versus all other CVEs

30-day change

+2.16 pp

From 0.40% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.56%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • nettyAll versions (No fix recorded)
Ubuntu1 product
  • nettyAll versions (No fix recorded)

2 vendors · 2 products

References

10 links