CVE-2026-47843 json
Reactor Netty may incorrectly route traffic due to DNS resolver reuse
published 2026-08-26 2 mo ago modified 2026-09-04 2 mo ago also EUVD-2026-66678
- cvss
- 3.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
In specific scenarios involving multiple clients with different DNS resolver configurations, Reactor Netty may incorrectly reuse a previously configured DNS resolver. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
Patch / fix
- broadcom reactor_netty 1.0.53, 1.2.19, 1.3.6.1
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-47843 updated cvss 3.7
io.projectreactor.netty/reactor-netty: Reactor Netty: Incorrect traffic routing due to DNS resolver reuse
-
Red Hat Fuse 7 reactor-netty 1.0.11.redhat-00001affected: no fix planned “Out of support scope”
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- Spring Reactor Netty
References
-
spring.io
/security/cve-2026-47843
vendor-advisory
Sources
- CVE List CVE-2026-47843
- NVD CVE-2026-47843
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