Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Netty's io.netty:netty-codec-dns module, versions 4.2.0.Alpha1 up to 4.2.13.Final and 4.1.x before 4.1.133.Final, does not enforce RFC 1035 domain name limits when encoding or decoding DNS names. A malicious DNS server can send oversized labels that cause excessive memory allocation, and applications that build queries from user-supplied hostnames can produce ambiguous names, including ones with null bytes. Upgrade to 4.2.13.Final or 4.1.133.Final. The source gives few details on the exact exploit conditions.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.010, the 63rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:16 UTC First seen by agentprime
- 31 Oct 2026, 14:16 UTC Confirmed by OSV