Quick answers
- Is CVE-2026-47843 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-47843 being exploited in the wild.
- How severe is CVE-2026-47843?
- Low severity, with a CVSS score of 3.7, published 26 August 2026.
- Which products and versions are affected?
- VMware Reactor Netty 1.0.52 and earlier, 1.1.0–1.2.18, 1.3.0–1.3.6.
- Is there a fix for CVE-2026-47843?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-47843 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-47843?
- Check whether you run VMware Reactor Netty at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This vulnerability occurs in Reactor Netty's DNS resolver management logic, where the resolver state is not properly isolated between clients with different configurations. The affected versions (1.0.52 and earlier, 1.1.0–1.2.18, and 1.3.0–1.3.6) fail to correctly handle DNS resolver instantiation when multiple clients are initialized with different resolver settings. An attacker with network access could potentially intercept or manipulate DNS resolution in applications using vulnerable versions. The fix is available in patched versions beyond those listed as vulnerable.
Affected products
- VMware Reactor Netty 1.0.52 and earlier, 1.1.0–1.2.18, 1.3.0–1.3.6
Timeline
- 2026-08-26: disclosed