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CVE-2026-44500— ZEBRA: Allocation Amplification in Inbound Network Deserializers

Quick assessment

Affected
ZcashFoundation zebra
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

zebra是Zcash Foundation开源的一个用Rust编写的Zcash全节点实现。 zebra 4.4.0之前版本存在安全漏洞，该漏洞源于多个入站反序列化路径分配缓冲区过大，可能导致攻击者强制节点预分配和解析大量数据。

CVSS 5.3 · Medium EPSS 0.36% · P30

Affected Version Matrix 3

VendorProduct Version RangeStatus
ZcashFoundation zebra zebrad < 4.4.0 affected
zebra-chain < 7.0.0 affected
zebra-network < 6.0.0 affected
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I. Basic Information for CVE-2026-44500

Vulnerability Information
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Vulnerability Title
ZEBRA: Allocation Amplification in Inbound Network Deserializers
Source: CVE Program / CVE List V5
Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0, prior to zebra-chain version 7.0.0, and prior to zebra-network version 6.0.0, several inbound deserialization paths in Zebra allocated buffers sized against generic transport or block-size ceilings before the tighter protocol or consensus limits were enforced. An unauthenticated or post-handshake peer could therefore force the node to preallocate and parse for orders of magnitude more data than the protocol intended, across headers messages, equihash solutions in block headers, Sapling spend vectors in V5/V4 transactions, and coinbase script bytes in blocks. This issue has been patched in zebrad version 4.4.0, zebra-chain version 7.0.0, and zebra-network version 6.0.0.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
zebra 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zebra是Zcash Foundation开源的一个用Rust编写的Zcash全节点实现。 zebra 4.4.0之前版本存在安全漏洞，该漏洞源于多个入站反序列化路径分配缓冲区过大，可能导致攻击者强制节点预分配和解析大量数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ZcashFoundation zebra zebrad < 4.4.0 -

II. Public POCs for CVE-2026-44500

# POC Description Source Link Shenlong Link
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Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 5580 chars
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III. Intelligence Information for CVE-2026-44500

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Vendor Advisories for CVE-2026-44500 (1)

Same Patch Batch · ZcashFoundation · 2026-05-08 · 7 CVEs total

CVE-2026-41585 ZEBRA: Denial of Service via Interrupted JSON-RPC Requests from Authenticated Clients
CVE-2026-41583 ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling
CVE-2026-41584 ZEBRA: rk Identity Point Panic in Transaction Verification
CVE-2026-44497 ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale Buffer
CVE-2026-44498 ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops
CVE-2026-44499 ZEBRA: Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning

IV. Related Vulnerabilities

Same product: zebra
Same vendor: ZcashFoundation
Same weakness: CWE-770

V. Comments for CVE-2026-44500

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