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CVE-2026-109364— Zebra 2.3.0 before 6.4.0 Peer Ban Bypass via Exact-IP Keying

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 2.3.0 至 6.4.0 版本（不含 6.4.0）存在一个保护机制缺陷，允许未认证的节点规避封禁，因为封禁和行为评分是基于精确 IP 地址进行绑定的。攻击者可以通过使用其 /64 分配范围内的新 IPv6 地址重新连接，或刷新包含 20,000 条记录的先进先出（FIFO）封禁列表，从而恢复被禁节点的网络访问权限。

CVSS 5.3 · Medium EPSS 0.24% · P13

Affected Version Matrix 2

VendorProduct Version RangeStatus
ZcashFoundation zebra 2.3.0< 6.4.0 affected
6.4.0 unaffected
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I. Basic Information for CVE-2026-109364

Vulnerability Information
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Vulnerability Title
Zebra 2.3.0 before 6.4.0 Peer Ban Bypass via Exact-IP Keying
Source: CVE Program / CVE List V5
Vulnerability Description
Zebra 2.3.0 before 6.4.0 contains a protection mechanism failure that allows unauthenticated peers to evade bans because bans and misbehavior scores are keyed on exact IP addresses. Attackers can reconnect from fresh IPv6 addresses in their /64 allocation or flush the 20,000-entry FIFO ban list to restore access for banned peers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ZcashFoundation zebra 2.3.0 ~ 6.4.0 -

II. Public POCs for CVE-2026-109364

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III. Intelligence Information for CVE-2026-109364

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Vendor Advisories for CVE-2026-109364 (2)

Same Patch Batch · ZcashFoundation · 2026-10-12 · 4 CVEs total

CVE-2026-109363 7.5 HIGH Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction
CVE-2026-109365 3.7 LOW Zebra before 6.4.0 Denial of Service via Same-Hash Forged Block Bodies
CVE-2026-109366 3.7 LOW Zebra before 6.4.0 Gossiped Block Drop via Forged Coinbase scriptSig Height

IV. Related Vulnerabilities

Same product: zebra
Same vendor: ZcashFoundation
Same weakness: CWE-693

V. Comments for CVE-2026-109364

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