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CVE-2026-44499— ZEBRA: Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning

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，该漏洞源于区块发现管道中的复合拒绝服务漏洞，可能导致远程攻击者永久停止新区块发现。

AI Predicted 7.5 Difficulty: Easy EPSS 0.54% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
ZcashFoundation zebra < 4.4.0 affected
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I. Basic Information for CVE-2026-44499

Vulnerability Information
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Vulnerability Title
ZEBRA: Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning
Source: CVE Program / CVE List V5
Vulnerability Description
ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, a composite denial-of-service vulnerability in Zebra's block discovery pipeline allows an unauthenticated remote attacker to permanently halt all new block discovery on a targeted node. The attack exploits three independent weaknesses in the gossip, syncer, and download subsystems — all exercisable from a single TCP connection — to create a monotonically growing block deficit that never self-heals. This issue has been patched in version 4.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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，该漏洞源于区块发现管道中的复合拒绝服务漏洞，可能导致远程攻击者永久停止新区块发现。
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 < 4.4.0 -

II. Public POCs for CVE-2026-44499

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III. Intelligence Information for CVE-2026-44499

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Vendor Advisories for CVE-2026-44499 (1)

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

CVE-2026-44500 5.3 MEDIUM ZEBRA: Allocation Amplification in Inbound Network Deserializers
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

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-44499

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