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10 vulnerabilities by zfnd
CVE-2026-44500 (GCVE-0-2026-44500)
Vulnerability from cvelistv5 – Published: 2026-05-08 15:10 – Updated: 2026-05-08 19:41
VLAI?
Title
ZEBRA: Allocation Amplification in Inbound Network Deserializers
Summary
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.
Severity ?
5.3 (Medium)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
zebrad < 4.4.0
Affected: zebra-chain < 7.0.0 Affected: zebra-network < 6.0.0 |
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CVE-2026-44498 (GCVE-0-2026-44498)
Vulnerability from cvelistv5 – Published: 2026-05-08 15:09 – Updated: 2026-05-08 15:09
VLAI?
Title
ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops. A miner who produces such a block can split the network: Zebra nodes follow the offending chain while zcashd nodes do not. This issue has been patched in version 4.4.0.
Severity ?
CWE
- CWE-682 - Incorrect Calculation
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
< 4.4.0
|
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CVE-2026-44497 (GCVE-0-2026-44497)
Vulnerability from cvelistv5 – Published: 2026-05-08 15:08 – Updated: 2026-05-08 15:48
VLAI?
Title
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale Buffer
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0 and prior to zebra-script version 6.0.0, the fix for CVE-2026-41583 introduced a separate issue due to insufficient error handling of the case where the sighash type is invalid, during sighash computation. Instead of returning an error, the normal flow would resume, and the input sighash buffer would be left untouched. In scenarios where a previous signature validation could leave a valid sighash in the buffer, an invalid hash-type could be incorrectly accepted, which would create a consensus split between Zebra and zcashd nodes. This issue has been patched in zebrad version 4.4.0 and zebra-script version 6.0.0.
Severity ?
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
zebra-script < 6.0.0
Affected: zebrad < 4.4.0 |
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CVE-2026-41585 (GCVE-0-2026-41585)
Vulnerability from cvelistv5 – Published: 2026-05-08 15:06 – Updated: 2026-05-08 21:27
VLAI?
Title
ZEBRA: Denial of Service via Interrupted JSON-RPC Requests from Authenticated Clients
Summary
ZEBRA is a Zcash node written entirely in Rust. From zebrad versions 2.2.0 to before 4.3.1 and from zebra-rpc versions 1.0.0-beta.45 to before 6.0.2, a vulnerability in Zebra's JSON-RPC HTTP middleware allows an authenticated RPC client to cause a Zebra node to crash by disconnecting before the request body is fully received. The node treats the failure to read the HTTP request body as an unrecoverable error and aborts the process instead of returning an error response. This issue has been patched in zebrad version 4.3.1 and zebra-rpc version 6.0.2.
Severity ?
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
zebra-rpc >= 1.0.0-beta.45, < 6.0.2
Affected: zebrad >= 2.2.0, < 4.3.1 |
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CVE-2026-41584 (GCVE-0-2026-41584)
Vulnerability from cvelistv5 – Published: 2026-05-08 15:05 – Updated: 2026-05-08 16:04
VLAI?
Title
ZEBRA: rk Identity Point Panic in Transaction Verification
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-chain version 6.0.2, Orchard transactions contain a rk field which is a randomized validating key and also an elliptic curve point. The Zcash specification allows the field to be the identity (a "zero" value), however, the orchard crate which is used to verify Orchard proofs would panic when fed a rk with the identity value. Thus an attacker could send a crafted transaction that would make a Zebra node crash. This issue has been patched in zebrad version 4.3.1 and zebra-chain version 6.0.2.
Severity ?
CWE
- CWE-617 - Reachable Assertion
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
zebra-chain < 6.0.2
Affected: zebrad < 4.3.1 |
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}
],
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CVE-2026-41583 (GCVE-0-2026-41583)
Vulnerability from cvelistv5 – Published: 2026-05-08 14:55 – Updated: 2026-05-08 19:42
VLAI?
Title
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version 5.0.2, after a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types for V5 transactions which were enabled in the NU5 network upgrade. Zebra nodes could thus accept and eventually mine a block that would be considered invalid by zcashd nodes, creating a consensus split between Zebra and zcashd nodes. In a similar vein, for V4 transactions, Zebra mistakenly used the "canonical" hash type when computing the sighash while zcashd (correctly per the spec) uses the raw value, which could also crate a consensus split. This issue has been patched in zebrad version 4.3.1 and zebra-script version 5.0.2.
Severity ?
CWE
- CWE-573 - Improper Following of Specification by Caller
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
zebrad < 4.3.1
Affected: zebra-script < 5.0.2 |
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CVE-2026-40881 (GCVE-0-2026-40881)
Vulnerability from cvelistv5 – Published: 2026-04-21 19:20 – Updated: 2026-04-21 20:36
VLAI?
Title
Zebra: addr/addrv2 Deserialization Resource Exhaustion
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-network version 5.0.1, when deserializing addr or addrv2 messages, which contain vectors of addresses, Zebra would fully deserialize them up to a maximum length (over 233,000) that was derived from the 2 MiB message size limit. This is much larger than the actual limit of 1,000 messages from the specification. Zebra would eventually check that limit but, at that point, the memory for the larger vector was already allocated. An attacker could cause out-of-memory aborts in Zebra by sending multiple such messages over different connections. This vulnerability is fixed in zebrad version 4.3.0 and zebra-network version 5.0.1.
Severity ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ZcashFoundation | zebrad |
Affected:
< 4.3.1
|
|||||||
|
|||||||||
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CVE-2026-40880 (GCVE-0-2026-40880)
Vulnerability from cvelistv5 – Published: 2026-04-21 19:18 – Updated: 2026-04-21 19:52
VLAI?
Title
Zebra: Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.
Severity ?
CWE
- CWE-1025 - Comparison Using Wrong Factors
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ZcashFoundation | zebrad |
Affected:
< 4.3.1
|
|||||||
|
|||||||||
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CVE-2026-34377 (GCVE-0-2026-34377)
Vulnerability from cvelistv5 – Published: 2026-03-31 14:05 – Updated: 2026-03-31 17:18
VLAI?
Title
Zebra has a Consensus Failure due to Improper Verification of V5 Transactions
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.
Severity ?
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
< 4.3.0
|
|||||||
|
|||||||||
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CVE-2026-34202 (GCVE-0-2026-34202)
Vulnerability from cvelistv5 – Published: 2026-03-31 14:02 – Updated: 2026-03-31 17:17
VLAI?
Title
Zebra node crash — V5 transaction hash panic (P2P reachable)
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra's transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash). This is triggered by sending a specially crafted V5 transaction that passes initial deserialization but fails during transaction ID calculation. This issue has been patched in zebrad version 4.3.0 and zebra-chain version 6.0.1.
Severity ?
CWE
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
< 4.3.0
|
|||||||
|
|||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-34202",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-31T17:16:55.754237Z",
"version": "2.0.3"
},
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}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-31T17:17:30.860Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "zebra",
"vendor": "ZcashFoundation",
"versions": [
{
"status": "affected",
"version": "\u003c 4.3.0"
}
]
},
{
"product": "zebra-chain",
"vendor": "ZcashFoundation",
"versions": [
{
"status": "affected",
"version": "\u003c 6.0.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra\u0027s transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash). This is triggered by sending a specially crafted V5 transaction that passes initial deserialization but fails during transaction ID calculation. This issue has been patched in zebrad version 4.3.0 and zebra-chain version 6.0.1."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 9.2,
"baseSeverity": "CRITICAL",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1336",
"description": "CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-94",
"description": "CWE-94: Improper Control of Generation of Code (\u0027Code Injection\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-31T14:02:56.454Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wg",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wg"
},
{
"name": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0"
},
{
"name": "https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements",
"tags": [
"x_refsource_MISC"
],
"url": "https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements"
}
],
"source": {
"advisory": "GHSA-qp6f-w4r3-h8wg",
"discovery": "UNKNOWN"
},
"title": "Zebra node crash \u2014 V5 transaction hash panic (P2P reachable)"
}
},
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"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-34202",
"datePublished": "2026-03-31T14:02:56.454Z",
"dateReserved": "2026-03-26T15:57:52.323Z",
"dateUpdated": "2026-03-31T17:17:30.860Z",
"state": "PUBLISHED"
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"dataVersion": "5.2"
}