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CVE-2026-109363— Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction

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.

ZcashFoundation 的 Zebra 6.4.0 至 6.4.2 之前的版本中存在一个漏洞，该版本会解析携带 pre-NU6.3 共识分支 ID 的 version 6 交易。然而，在构造 UnminedTx（未确认交易）期间进行大小计算时，系统假设 Orchard 数据包的重新序列化永远不会失败（即不可失败）。因此，当实际发生错误时，会触发一个 expect 断言，导致 zebrad 进程中止崩溃。未经身份验证的对等节点只需发送一条 pre-handshake（握手前）交易消息即可使节点崩溃，并且在每次

CVSS 7.5 · High EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
ZcashFoundation zebra 6.4.0< 6.4.2 affected
6.4.2 unaffected
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I. Basic Information for CVE-2026-109363

Vulnerability Information
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Vulnerability Title
Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction
Source: CVE Program / CVE List V5
Vulnerability Description
ZcashFoundation Zebra 6.4.0 before 6.4.2 parses version 6 transactions carrying a pre-NU6.3 consensus branch ID, but the size computation during UnminedTx construction treats re-serialization of the Orchard bundle as infallible, so the resulting error trips an expect that aborts zebrad. Unauthenticated peers can send a single pre-handshake tx message to crash the node, and can repeat this after each 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
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ZcashFoundation zebra 6.4.0 ~ 6.4.2 -

II. Public POCs for CVE-2026-109363

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-109363

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Patches & Fixes for CVE-2026-109363 (1)

Vendor Advisories for CVE-2026-109363 (2)

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

CVE-2026-109364 5.3 MEDIUM Zebra 2.3.0 before 6.4.0 Peer Ban Bypass via Exact-IP Keying
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-617

V. Comments for CVE-2026-109363

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