CVE-2026-123557 Zebra zebrad before 7.0.0 Reachable Assertion DoS via Peer Disconnection
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123557?
CVE-2026-123557 is a high-severity vulnerability in ZcashFoundation zebra, published on 8 Nov 2026.
Official description
ZcashFoundation Zebra zebrad before 7.0.0 contains a reachable assertion race condition that allows unauthenticated remote peers to abort the node by triggering disconnection during a blocked outbound send. Malicious peers can return empty FindBlocks or FindHeaders replies and stop reading their socket, dropping an unresolved MustUseClientResponseSender and terminating syncing nodes.
Weakness: CWE-617
Which versions are affected by CVE-2026-123557?
How do I fix CVE-2026-123557?
No fix has been published for CVE-2026-123557 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123557 being exploited?
There is no known exploitation of CVE-2026-123557 in the wild and no public exploit code.
Sources
Also known as GHSA-6v36-c42v-v98p, GHSA-cpwj-fm29-9h32.