High severity7.5NVD Advisory· Published Nov 8, 2026· Updated Nov 8, 2026

CVE-2026-123558

Description

Zebra zebrad before 7.0.0 contains a denial of service vulnerability that allows a malicious peer to stall checkpoint sync by cancelling the verifier rewind after a failed commit. Attackers can serve a forged block with altered authorizing data plus a restart-triggering block, leaving the verifier rejecting honest blocks until restart.

Affected products

Zebra/zebradllm-fuzzy
Range: <7.0.0
ZcashFoundation/Zebrallm-fuzzy
Range: <7.0.0

Patches

Vulnerability mechanics

References

github.com/ZcashFoundation/zebra/security/advisories/GHSA-2w9f-9wx8-f5c8nvd
www.vulncheck.com/advisories/zebra-before-7.0.0-checkpoint-sync-denial-of-service-via-cancelled-verifier-rewindnvd

News mentions

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