Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Netty's netty-resolver-dns package, versions 4.2.0.Final up to but not including 4.2.15.Final, and 4.1.x versions before 4.1.135.Final, uses a predictable random number generator for DNS transaction IDs and a static UDP source port by default. An attacker who can send spoofed DNS responses may be able to poison the resolver's cache and redirect applications to malicious IP addresses. Upgrade to 4.2.15.Final or 4.1.135.Final, or later.
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 |
|---|---|---|---|---|
| 6.8 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0032, the 25th 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
Sources
- GitHub Advisory Database: GHSA-xmv7-r254-6q78
- OSV: GHSA-xmv7-r254-6q78
- github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78
- nvd.nist.gov/vuln/detail/CVE-2026-45673
- github.com/netty/netty
- github.com/netty/netty/releases/tag/netty-4.1.135.Final
- github.com/netty/netty/releases/tag/netty-4.2.15.Final