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VulnerabilityPublished Updated

CVE-2026-93573: Netty's HTTP/1.1 decoder · CWE-444

Affects nettySource GCVE Database

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Authoritative record:CVE-2026-93573· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium.

Data as of 7 Nov 2026, 23:24 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.16.5
EPSS
1.0% chance of exploitation in 30 days – higher than 65% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 7 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10nettypkg:deb/ubuntu/netty?arch=source&distro=stonkingOther threatsAffected
  • =1:4.1.48-16
  • =1:4.1.48-16ubuntu1
Fixed in–
Ubuntu Pro 26.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/resoluteOther threatsAffected
  • 1:4.1.48-10 – 1:4.1.48-16ubuntu0.1~esm2
7 affected builds
Fixed in–
Ubuntu Pro 24.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/nobleOther threatsAffected
  • 1:4.1.48-7 – 1:4.1.48-9ubuntu0.2+esm2
11 affected builds
Fixed in–
Ubuntu Pro 22.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/jammyOther threatsAffected
  • 1:4.1.48-4 – 1:4.1.48-4+deb11u2ubuntu0.2+esm1
10 affected builds
Fixed in–
Ubuntu Pro 20.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/focalOther threatsAffected
  • 1:4.1.33-1 – 1:4.1.45-1ubuntu0.1~esm7
10 affected builds
Fixed in–
Ubuntu Pro 18.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/bionicOther threatsAffected
  • 1:4.1.7-4 – 1:4.1.7-4ubuntu0.1~esm1
10 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released an important security update in Red Hat build of Quarkus version 3.33.3.SP2 that addresses this vulnerability. Users should upgrade to this version or later to remediate the issue. Before applying this update, ensure all previously released errata relevant to your system have been applied. No other specific mitigations are indicated by the vendor advisory.

Description

CVE-2026-93573 is a medium severity vulnerability in Netty's HTTP/1.1 decoder used by Red Hat build of Quarkus 3.27.5.SP2. It allows remote attackers to bypass Transfer-Encoding header validation by splitting the Transfer-Encoding field across multiple headers, with the last field containing a non-final transfer coding such as gzip or deflate. This enables HTTP request smuggling, which can lead to bypassing security controls and desynchronizing request processing. Red Hat has released an important security update in Quarkus 3.33.3.SP2 that addresses this vulnerability along with others.

References

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