CVE-2026-93568: Netty. A remote attacker · Improper Input Validation
Affects nettySource GCVE Database
Not known to be exploited · CVSS 7.5 High.
Data as of 7 Nov 2026, 23:24 UTC
Thin evidence
One scorer or none| CNA (redhat) | CVSS 3.1 | 7.5 |
|---|
- 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:N/I:H/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 8 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
A fix is available in Red Hat build of Quarkus 3.33.3.SP2 as per the Red Hat security advisory RHSA-2026:69440. Users should apply this official update to remediate the vulnerability. Follow the vendor's guidance for applying the update and ensure all prior relevant errata are applied before updating.
Description
CVE-2026-93568 is a vulnerability in Netty where specially crafted HTTP/2 or HTTP/3 Extended CONNECT requests are incorrectly processed as HTTP/1.1 CONNECT requests. This leads to loss of critical protocol and path information, potentially allowing authorization bypasses in applications relying on Netty for HTTP/2 or HTTP/3 communication. The vulnerability has a CVSS score of 7.5, rated as high severity. Red Hat has issued a security advisory for Red Hat build of Quarkus 3.33.3.SP2 that includes a fix for this issue. Users are advised to apply the update according to vendor guidance.
References
- ubuntu.com/security/CVE-2026-93568 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93568 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2536961 (opens in a new tab)
- github.com/netty/netty/security/advisories/GHSA-w6j8-x45j-w75f (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93568 (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)
- access.redhat.com/errata/RHSA-2026:70257 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:83612 (opens in a new tab)