Node crashes via pre-limit address vector allocation
Published Apr 21, 2026 · Updated Apr 21, 2026
Resource exhaustion in Zebra before 4.3.1 and zebra-network before 5.0.1 allows remote attackers to crash nodes via addr messages. The read_addr and read_addrv2 paths in codec.rs let zcash_deserialize allocate vectors for up to 69,904 or 233,016 entries before enforcing the 1,000-entry protocol limit. Multiple oversized messages across separate peer connections can exhaust process memory and trigger an out-of-memory abort, with no reported confidentiality or integrity impact.
Summary
What happened
Resource exhaustion in Zebra before 4.3.1 and zebra-network before 5.0.1 allows remote attackers to crash nodes via addr messages. The read_addr and read_addrv2 paths in codec.rs let zcash_deserialize allocate vectors for up to 69,904 or 233,016 entries before enforcing the 1,000-entry protocol limit. Multiple oversized messages across separate peer connections can exhaust process memory and trigger an out-of-memory abort, with no reported confidentiality or integrity impact.
The record
- CVE
- CVE-2026-40881
- Published
- Apr 21, 2026
- Updated
- Apr 21, 2026
- Vendor
- Zcash Foundation
- Product
- zebra-network
- Classifications
- CWE-770, CAPEC-130, CAPEC-231, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 21, 2026CVE publishedPublication date reported by the CVE source.
- Apr 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 5.0.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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