CVE-2026-44500: CWE-770: Allocation of Resources Without Limits or Throttling in ZcashFoundation zebra
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.
AI Analysis
Technical Summary
Zebra, a Zcash node implementation in Rust, had a vulnerability (CWE-770) where inbound deserialization paths allocated buffers based on generic transport or block-size ceilings rather than tighter protocol or consensus limits. This allowed unauthenticated or post-handshake peers to force the node to preallocate and parse excessive amounts of data across various message types, including headers, equihash solutions, Sapling spend vectors, and coinbase scripts. The vulnerability was patched in zebrad 4.4.0, zebra-chain 7.0.0, and zebra-network 6.0.0.
Potential Impact
The vulnerability can lead to resource exhaustion (denial of service) by causing the node to allocate and process much larger data buffers than intended. There is no impact on confidentiality or integrity, only availability. No known exploits are reported in the wild.
Mitigation Recommendations
Users should upgrade to zebrad version 4.4.0 or later, zebra-chain version 7.0.0 or later, and zebra-network version 6.0.0 or later to apply the official fixes. Patch status is not explicitly stated in the vendor advisory, but the description confirms the issue is fixed in these versions. No additional mitigation is indicated.
CVE-2026-44500: CWE-770: Allocation of Resources Without Limits or Throttling in ZcashFoundation zebra
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Zebra, a Zcash node implementation in Rust, had a vulnerability (CWE-770) where inbound deserialization paths allocated buffers based on generic transport or block-size ceilings rather than tighter protocol or consensus limits. This allowed unauthenticated or post-handshake peers to force the node to preallocate and parse excessive amounts of data across various message types, including headers, equihash solutions, Sapling spend vectors, and coinbase scripts. The vulnerability was patched in zebrad 4.4.0, zebra-chain 7.0.0, and zebra-network 6.0.0.
Potential Impact
The vulnerability can lead to resource exhaustion (denial of service) by causing the node to allocate and process much larger data buffers than intended. There is no impact on confidentiality or integrity, only availability. No known exploits are reported in the wild.
Mitigation Recommendations
Users should upgrade to zebrad version 4.4.0 or later, zebra-chain version 7.0.0 or later, and zebra-network version 6.0.0 or later to apply the official fixes. Patch status is not explicitly stated in the vendor advisory, but the description confirms the issue is fixed in these versions. No additional mitigation is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-06T18:28:20.886Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fdff98cbff5d8610e6debb
Added to database: 5/8/2026, 3:22:00 PM
Last enriched: 5/8/2026, 3:37:25 PM
Last updated: 5/8/2026, 9:56:34 PM
Views: 9
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