Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N C H H N 10.0 .0032 24.6 —
AFFECTED Product Versions Fixed netty >= 4.2.0.Final, < 4.2.15.Final – —
TIMELINE May 19 Reserved by GitHub_M Jun 12 Published (CNA: GitHub_M) Aug 13 RESCORED — CVE-2026-47691 (netty). CVSS 8.7 → 10 (NVD).
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's `DnsResolveContext` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). In `io.netty.resolver.dns.DnsResolveContext.AuthoritativeNameServerList#add` method accepts any NS record from the AUTHORITY section as long as the record's name is a suffix of the questionName. Subsequently, the `handleWithAdditional` method caches the associated A records from the ADDITIONAL section directly into the `authoritativeDnsServerCache` under the parent domain's key. This bypasses standard bailiwick rules, where a server authoritative for a subdomain should not be trusted to provide authoritative records for its parent. The poisoned cache is then used for all future resolutions under the parent domain's key. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
| Date | Event | Detail |
|---|---|---|
| May 19, 2026 | Reserved | Reserved by GitHub_M |
| June 12, 2026 | Published | Published (CNA: GitHub_M) |
| August 13, 2026 | RESCORED | RESCORED — CVE-2026-47691 (netty). CVSS 8.7 → 10 (NVD). |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| netty | netty | — | >= 4.2.0.Final, < 4.2.15.Final | — |
Authoritative record: CVE-2026-47691 at cve.org
Vendors: netty
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-47691 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.