CVE-2026-104425: Asymmetric Resource Consumption (Amplification) in ZcashFoundation zebra
ZcashFoundation Zebra before 6.1.0 contains a resource exhaustion vulnerability that allows unauthenticated peers to degrade block processing by pushing transactions with invalid Orchard proofs without being misbehavior-scored. Attackers can repeatedly push invalid proofs into the shared halo2 batch verifier, forcing honest block proofs onto the slow individual-verification path and slowing block processing roughly sevenfold.
AI Analysis
Technical Summary
CVE-2026-104425 describes a resource exhaustion vulnerability in ZcashFoundation Zebra prior to version 6.1.0. Unauthenticated peers can exploit this by pushing transactions containing invalid Orchard proofs into the shared halo2 batch verifier. This forces honest block proofs onto a slower individual verification path, significantly degrading block processing speed by approximately sevenfold. The vulnerability does not require authentication or user interaction and has a CVSS 4.0 base score of 6.9, indicating a medium severity level.
Potential Impact
The vulnerability allows attackers to degrade the performance of block processing in Zebra nodes, potentially slowing down the network's transaction validation and block propagation. This can affect node availability and responsiveness but does not directly compromise confidentiality, integrity, or availability of data beyond performance degradation. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade Zebra to version 6.1.0 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the affectedVersions field indicating the fix in 6.1.0.
CVE-2026-104425: Asymmetric Resource Consumption (Amplification) in ZcashFoundation zebra
Description
ZcashFoundation Zebra before 6.1.0 contains a resource exhaustion vulnerability that allows unauthenticated peers to degrade block processing by pushing transactions with invalid Orchard proofs without being misbehavior-scored. Attackers can repeatedly push invalid proofs into the shared halo2 batch verifier, forcing honest block proofs onto the slow individual-verification path and slowing block processing roughly sevenfold.
CVSS v4.0
Score 6.9medium
Affected software
ZcashFoundation
zebra
pkg:github/zcashfoundation/zebraRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-104425 describes a resource exhaustion vulnerability in ZcashFoundation Zebra prior to version 6.1.0. Unauthenticated peers can exploit this by pushing transactions containing invalid Orchard proofs into the shared halo2 batch verifier. This forces honest block proofs onto a slower individual verification path, significantly degrading block processing speed by approximately sevenfold. The vulnerability does not require authentication or user interaction and has a CVSS 4.0 base score of 6.9, indicating a medium severity level.
Potential Impact
The vulnerability allows attackers to degrade the performance of block processing in Zebra nodes, potentially slowing down the network's transaction validation and block propagation. This can affect node availability and responsiveness but does not directly compromise confidentiality, integrity, or availability of data beyond performance degradation. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade Zebra to version 6.1.0 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the affectedVersions field indicating the fix in 6.1.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-02T00:46:23.830Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abf99afa43b0b3b89b26904
Added to database: 10/02/2026, 11:46:55 UTC
Last enriched: 10/02/2026, 12:02:41 UTC
Last updated: 10/03/2026, 03:09:46 UTC
Views: 13
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.