CVE-2026-93573: Netty's HTTP/1.1 decoder · CWE-444
Affects nettySource GCVE Database
Not known to be exploited · CVSS 6.5 Medium.
Data as of 7 Nov 2026, 23:24 UTC
Thin evidence
One scorer or none| CNA (redhat) | CVSS 3.1 | 6.5 |
|---|
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 18 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10nettypkg:deb/ubuntu/netty?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu Pro 26.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/resoluteOther threats | Affected
| Fixed in– |
Ubuntu Pro 24.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/nobleOther threats | Affected
| Fixed in– |
Ubuntu Pro 22.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/jammyOther threats | Affected
| Fixed in– |
Ubuntu Pro 20.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/focalOther threats | Affected
| Fixed in– |
Ubuntu Pro 18.04 LTSnettypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/bionicOther threats | Affected
| 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
- ubuntu.com/security/CVE-2026-93573 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93573 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2536964 (opens in a new tab)
- github.com/netty/netty/security/advisories/GHSA-3jrc-fchc-59pw (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93573 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:69440 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:69470 (opens in a new tab)