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VulnerabilityPublished Updated

CVE-2026-93578: netty

Affects nettySource GCVE Database

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Authoritative record:CVE-2026-93578· Medium 5.9

Not known to be exploited · CVSS 5.9 Medium.

Data as of 9 Nov 2026, 23:24 UTC

CVSS 3.1 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/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 9 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

Until a fix is available, users should consider alternative methods to validate certificate revocation or apply additional verification controls outside of Netty's OCSP client.

Description

A vulnerability in Netty's Online Certificate Status Protocol (OCSP) Client allows bypassing certificate revocation checks because the client does not verify the 'id-kp-OCSPSigning' Extended Key Usage in OCSP responder certificates. This flaw enables a remote attacker with any valid certificate from the same CA to forge 'GOOD' OCSP responses for revoked certificates, potentially causing authorization bypass in applications using affected Netty versions.

References

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