CVE-2026-44499— ZEBRA: Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-44500
ZEBRA: Allocation Amplification in Inbound Network Deseriali - CVE-2026-44498
ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops - CVE-2026-44497
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type - CVE-2026-41585
ZEBRA: Denial of Service via Interrupted JSON-RPC Requests f - CVE-2026-41584
ZEBRA: rk Identity Point Panic in Transaction Verification
Same vendor: ZcashFoundation
- CVE-2026-44500
ZEBRA: Allocation Amplification in Inbound Network Deseriali - CVE-2026-44498
ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops - CVE-2026-44497
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type - CVE-2026-41585
ZEBRA: Denial of Service via Interrupted JSON-RPC Requests f - CVE-2026-41584
ZEBRA: rk Identity Point Panic in Transaction Verification
Same weakness: CWE-770
- CVE-2026-42294
Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in W - CVE-2026-42189
Russh: Pre-auth DoS via unbounded allocation in keyboard-int - CVE-2026-42793
Atom table exhaustion via attacker-controlled GraphQL SDL na - CVE-2026-44500
ZEBRA: Allocation Amplification in Inbound Network Deseriali - CVE-2026-8124
GPAC box_code_base.c sidx_box_read allocation of resources
V. Comments for CVE-2026-44499
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