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CVE-2026-123555— Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures

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 2.3.0 至 7.0.0 之前的版本中存在一个拒绝服务漏洞。该漏洞允许未认证的对等节点通过发送包含无效透明脚本的交易或区块，从而规避对不良行为的评分机制。攻击者可以利用此漏洞，向内存池（mempool）中大量注入因脚本验证失败的交易，或提供伪造的 v5 区块主体（其中脚本签名字段 的字节已被篡改），以耗尽 CPU 资源并反复阻塞区块同步过程。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-123555

Vulnerability Information
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Vulnerability Title
Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures
Source: CVE Program / CVE List V5
Vulnerability Description
Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync.
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
对异常条件的处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ZcashFoundation zebra 2.3.0 ~ 7.0.0 -
ZcashFoundation zebra 1.0.0-beta.46 ~ 18.0.0 -

II. Public POCs for CVE-2026-123555

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-123555

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Other References for CVE-2026-123555 (3)

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

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-2026-123560 7.5 HIGH Zebra before 7.0.0 Sync Denial of Service via Forged Checkpoint Block Body
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-755