CVE-2026-123560— Zebra before 7.0.0 Sync Denial of Service via Forged Checkpoint Block Body

Quick assessment

Affected

ZcashFoundation zebra

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zebra 在 7.0.0 版本之前存在一个清理不完整的漏洞，允许未认证的节点通过提供伪造的检查点区块体来阻塞初始同步过程。攻击者可以在最终检查点附近提交包含伪造授权数据的区块体，导致被拒绝的哈希值残留在“已发送哈希集合”中，从而使节点停止请求区块，直至重启为止。

CVSS 7.5 · High Updated Nov 08, 2026

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

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Vulnerability Information

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Vulnerability Title

Zebra before 7.0.0 Sync Denial of Service via Forged Checkpoint Block Body

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

清理环节不完整

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
ZcashFoundation	zebra	0 ~ 7.0.0	-

II. Public POCs for CVE-2026-123560

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-123560

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Other References for CVE-2026-123560 (2)

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-9hq5-pfgc-cx5h vendor-advisory
https://www.vulncheck.com/advisories/zebra-before-7.0.0-sync-denial-of-service-via-forged-checkpoint-block-body third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123560

Same Patch Batch · ZcashFoundation · 2026-11-08 · 7 CVEs total

CVE-2026-123555	7.5 HIGH	Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures
CVE-2026-123558	7.5 HIGH	Zebra before 7.0.0 Checkpoint Sync Denial of Service via Cancelled Verifier Rewind
CVE-2026-123554	7.5 HIGH	Zebra zebrad 6.4.0 before 7.0.0 Denial of Service via Mempool Coinbase-Maturity Check
CVE-2026-123559	7.5 HIGH	Zebra before 7.0.0 Denial of Service via Quadratic Sighash Computation
CVE-2026-123557	5.9 MEDIUM	Zebra zebrad before 7.0.0 Reachable Assertion DoS via Peer Disconnection
CVE-2026-123556	5.3 MEDIUM	Zebra 4.5.0 before 7.0.0 Honest Peer Ban via Mempool Lock-Time Scoring

IV. Related Vulnerabilities

Same product: zebra

Same vendor: ZcashFoundation

Same weakness: CWE-459