CVE-2026-123560
Zebra before 7.0.0 Sync Denial of Service via Forged Checkpoint Block Body
Zebra before 7.0.0 contains an incomplete cleanup vulnerability that allows unauthenticated peers to stall initial sync by serving a forged checkpoint block body. Attackers can supply a body with forged authorizing data near the final checkpoint, leaving rejected hashes in the sent-hash set so the node stops requesting blocks until restart.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| zebra ZcashFoundation zebrad
cargo |
≥ 0; < 7.0.0 (affected, semver) 7.0.0 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.7 high |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: VulnCheck |
| 4.0 / 8.7 high |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-9hq5-pfgc-cx5hCNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/zebra-before-7.0.0-sync-denial-of-service-via-forged-checkpoint-block-bodyCNA: VulnCheck · third-party-advisory
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-9hq5-pfgc-cx5h[email protected]
- https://www.vulncheck.com/advisories/zebra-before-7.0.0-sync-denial-of-service-via-forged-checkpoint-block-body[email protected]
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