CVE-2026-35679Network attack vector

Invalid transaction acceptance via cached incomplete verification

Published Apr 5, 2026 · Updated Apr 5, 2026

Consensus validation in Zcash zcashd before 6.12.0 allows attackers to introduce invalid Sprout transactions through newly connected tip blocks. CheckBlock set the fChecked cache flag after an initial pass with Sprout proof verification disabled, so the later strict pass skipped every check. Exploitation requires mining-pool cooperation and a transaction first seen in a new block; successful acceptance splits the chain and enables Sprout fund theft.

CVSS severity3.5
Low
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Consensus validation in Zcash zcashd before 6.12.0 allows attackers to introduce invalid Sprout transactions through newly connected tip blocks. CheckBlock set the fChecked cache flag after an initial pass with Sprout proof verification disabled, so the later strict pass skipped every check. Exploitation requires mining-pool cooperation and a transaction first seen in a new block; successful acceptance splits the chain and enables Sprout fund theft.

The record

CVE
CVE-2026-35679
Published
Apr 5, 2026
Updated
Apr 5, 2026
Vendor
Zcash
Product
zcashd
Classifications
CWE-358, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 5, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.12.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zcash · zcashdversion=0 <6.12.0

Published CVSS scores

3.5MITRECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-358Improperly Implemented Security Check for Standard
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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