CVE-2026-44498: CWE-682: Incorrect Calculation in ZcashFoundation zebra
Zebra, a Zcash node implementation written in Rust, had a vulnerability prior to version 4. 4. 0 where its block validator undercounted transparent signature operations against the 20000-sigop block limit. This allowed Zebra nodes to accept blocks that the reference implementation zcashd would reject, potentially causing a network split. The issue is identified as an incorrect calculation (CWE-682) and has been fixed in Zebra version 4. 4. 0.
AI Analysis
Technical Summary
CVE-2026-44498 describes a critical vulnerability in Zebra versions before 4.4.0 where the block validator incorrectly counts transparent signature operations (sigops) against the maximum allowed per block (20000). This undercounting permits Zebra nodes to accept blocks that violate the sigop limit and are rejected by zcashd nodes, leading to a consensus divergence and potential network split. The vulnerability is classified under CWE-682 (Incorrect Calculation). The issue has been addressed and patched in Zebra version 4.4.0.
Potential Impact
The vulnerability allows a miner to produce blocks that Zebra nodes accept but zcashd nodes reject due to exceeding the sigop limit. This discrepancy can cause a network split, undermining consensus and potentially disrupting the blockchain network's integrity. The CVSS 4.0 base score is 9.2, indicating critical severity with high impact on availability and integrity.
Mitigation Recommendations
Upgrade Zebra to version 4.4.0 or later, where the incorrect sigop counting issue has been fixed. No other mitigation is indicated or required as the patch resolves the vulnerability.
CVE-2026-44498: CWE-682: Incorrect Calculation in ZcashFoundation zebra
Description
Zebra, a Zcash node implementation written in Rust, had a vulnerability prior to version 4. 4. 0 where its block validator undercounted transparent signature operations against the 20000-sigop block limit. This allowed Zebra nodes to accept blocks that the reference implementation zcashd would reject, potentially causing a network split. The issue is identified as an incorrect calculation (CWE-682) and has been fixed in Zebra version 4. 4. 0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-44498 describes a critical vulnerability in Zebra versions before 4.4.0 where the block validator incorrectly counts transparent signature operations (sigops) against the maximum allowed per block (20000). This undercounting permits Zebra nodes to accept blocks that violate the sigop limit and are rejected by zcashd nodes, leading to a consensus divergence and potential network split. The vulnerability is classified under CWE-682 (Incorrect Calculation). The issue has been addressed and patched in Zebra version 4.4.0.
Potential Impact
The vulnerability allows a miner to produce blocks that Zebra nodes accept but zcashd nodes reject due to exceeding the sigop limit. This discrepancy can cause a network split, undermining consensus and potentially disrupting the blockchain network's integrity. The CVSS 4.0 base score is 9.2, indicating critical severity with high impact on availability and integrity.
Mitigation Recommendations
Upgrade Zebra to version 4.4.0 or later, where the incorrect sigop counting issue has been fixed. No other mitigation is indicated or required as the patch resolves the vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-06T18:28:20.886Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fdff95cbff5d8610e6d709
Added to database: 5/8/2026, 3:21:57 PM
Last enriched: 5/8/2026, 3:36:25 PM
Last updated: 5/8/2026, 9:56:35 PM
Views: 7
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