CVE-2026-93561: io.netty/netty-codec-memcache
Affects nettySource GCVE Database
Not known to be exploited · CVSS 6.5 Medium.
Data as of 7 Nov 2026, 23:24 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% 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
Until a fix is available, consider limiting exposure to untrusted Memcache servers and reviewing proxy/cache configurations to mitigate potential data leakage.
Description
A vulnerability in io.netty/netty-codec-memcache allows a malicious Memcache server to exploit a protocol parsing flaw. The codec incorrectly interprets keyLength and extrasLength fields as signed instead of unsigned, causing frame desynchronization and response smuggling. This can lead to one client's data being exposed to another in proxy or cache environments. The issue affects multiple specific versions of netty. The CVSS score is 6.5, indicating medium severity.
References
- ubuntu.com/security/CVE-2026-93561 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93561 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2536949 (opens in a new tab)
- github.com/netty/netty/security/advisories/GHSA-wxrh-4rgq-pjcg (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93561 (opens in a new tab)