GHSA-jhpv-4q4f-43g5: Akka.Remote (CVE-2025-61778)

Package	Ecosystem	Affected	Fixed in
Akka.Remote	NuGet	>=1.2.0, <1.5.52	1.5.52
Akka.Cluster	NuGet	>=1.2.0, <1.5.52	1.5.52

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Akka.Remote and Akka.Cluster versions from 1.2.0 up to but not including 1.5.52 are affected. When TLS is enabled on the dot-netty TCP transport, the server checks certificates on inbound connections but does not require outbound clients to present their own certificate. An attacker with network access to the cluster can therefore connect without a certificate and communicate with cluster members. Upgrade Akka.Remote and Akka.Cluster to 1.5.52 or later.

Written 9 Nov 2026.

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
9.3	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0031, the 23rd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:22 UTC First seen by agentprime
31 Oct 2026, 15:22 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.