CVE-2026-104436— Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length
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.
在 Zebra 版本低于 4.5.0 的版本中存在一个不受控的资源消耗漏洞，允许远程 P2P 对等节点通过发送过大的区块定位器向量（block locator vectors）来耗尽阻塞线程池中的线程。攻击者可以发送 getblocks 或 getheaders 消息，其中包含最多 65,535 个定位器哈希值（locator hashes），从而触发针对每个哈希值的链查找操作，进而降低区块验证、RPC 以及内存池（mempool）的性能。
Possible ATT&CK Techniques 1 AI
T1496 · Resource HijackingAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ZcashFoundation | zebra | < 4.5.0 |
affected |
4.5.0 |
unaffected | ||
< 8.0.0 |
affected | ||
8.0.0 |
unaffected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-104436
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length
Source: CVE Program / CVE List V5
Vulnerability Description
Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| ZcashFoundation | zebra | 0 ~ 4.5.0 | - |
|
| ZcashFoundation | zebra | 0 ~ 8.0.0 | - |
|
II. Public POCs for CVE-2026-104436
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-104436
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-104436 (2)
Same Patch Batch · ZcashFoundation · 2026-10-02 · 18 CVEs total
| CVE-2026-104422 | 7.5 HIGH | Zebra before 6.3.0 Block Sync Denial of Service via Coinbase scriptSig Rewrite |
| CVE-2026-104431 | 7.5 HIGH | Zebra before 6.0.0 Denial of Service via Synchronous Script FFI Verification |
| CVE-2026-104430 | 7.5 HIGH | Zebra 4.5.0 Consensus Split via P2SH Sigop Overcount |
| CVE-2026-104423 | 7.5 HIGH | Zebra before 6.2.1 Denial of Service via Uncapped V6 Shielded Proof Verification |
| CVE-2026-104437 | 7.4 HIGH | Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missing-Output Handling |
| CVE-2026-104435 | 7.4 HIGH | Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output |
| CVE-2026-104434 | 6.5 MEDIUM | Zebra before 8.0.0 Denial of Service via z_listunifiedreceivers RPC |
| CVE-2026-104426 | 5.9 MEDIUM | Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value Check |
| CVE-2026-104427 | 5.9 MEDIUM | Zebra before 6.1.0 Chain Stall via Stale parent_error_map Entry |
| CVE-2026-104432 | 5.3 MEDIUM | Zebra before 6.3.0 False Readiness via Discarded One-Hash FindBlocks Response |
| CVE-2026-104425 | 5.3 MEDIUM | Zebra before 6.1.0 Batch-Verification Poisoning DoS via Unattributed Pushed Transactions |
| CVE-2026-104420 | 5.3 MEDIUM | Zebra before 6.3.0 Peer Misbehavior Ban Bypass via Gossiped Blocks |
| CVE-2026-104429 | 5.3 MEDIUM | Zebra before 6.0.0-rc.0 Per-Peer Mempool Admission Bypass via P2P tx Messages |
| CVE-2026-104421 | 5.3 MEDIUM | Zebra before 6.2.1 Block Download Denial of Service via KnownBlock SentHashes Lockout |
| CVE-2026-104428 | 5.3 MEDIUM | Zebra before 11.0.0 Denial of Service via getblock Verbosity 2 |
| CVE-2026-104419 | 4.8 MEDIUM | Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes |
| CVE-2026-104424 | 3.7 LOW | Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplate |
IV. Related Vulnerabilities
Same product: zebra
-
CVE-2026-104437
Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missin -
CVE-2026-104434
Zebra before 8.0.0 Denial of Service via z_listunifiedreceiv -
CVE-2026-104435
Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Witho -
CVE-2026-104432
Zebra before 6.3.0 False Readiness via Discarded One-Hash Fi -
CVE-2026-104431
Zebra before 6.0.0 Denial of Service via Synchronous Script
Same vendor: ZcashFoundation
-
CVE-2026-104437
Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missin -
CVE-2026-104434
Zebra before 8.0.0 Denial of Service via z_listunifiedreceiv -
CVE-2026-104435
Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Witho -
CVE-2026-104431
Zebra before 6.0.0 Denial of Service via Synchronous Script -
CVE-2026-104432
Zebra before 6.3.0 False Readiness via Discarded One-Hash Fi
Same weakness: CWE-770
-
CVE-2026-105127
LaraDashboard 1.4.2 before 1.4.8 Resource Exhaustion via Pas -
CVE-2026-97873
Legacy PBES1 and PKCS#12 PBE iteration count honoured unboun -
CVE-2026-104845
Seroval: Memory exhaustion via unchecked TypedArray length i -
CVE-2026-66054
Apache Thrift: C++ THeaderTransport does not enforce configu -
CVE-2026-61374
Apache Thrift: Java TSaslTransport post-auth data-frame miss
V. Comments for CVE-2026-104436
No comments yet