FKIE_CVE-2026-54496
Vulnerability from fkie_nvd - Published: 2026-07-17 17:17 - Updated: 2026-07-17 18:45
Severity
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad 5.0.0, halo2_gadgets 0.5.0, orchard 0.14.0, zcash_primitives 0.28.0, and zcashd 6.20.0, the variable-base scalar multiplication gadget in halo2_gadgets/src/ecc/chip/mul/incomplete.rs used assign_advice() for the base point without a copy constraint tying it to the actual base, allowing a malicious prover to produce a valid proof for an Orchard Action with an under-constrained base point and bypass the diversified-address-integrity check that binds pk_d, g_d, ivk, the nullifier (nf), and the spend validating key (ak) to the note being spent. This issue is fixed in zebrad 5.0.0, halo2_gadgets 0.5.0, orchard 0.14.0, zcash_primitives 0.28.0, and zcashd 6.20.0.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"product": "zebra",
"vendor": "ZcashFoundation",
"versions": [
{
"status": "affected",
"version": "\u003c 5.0.0"
}
]
},
{
"product": "halo2_gadgets",
"vendor": "zcash",
"versions": [
{
"status": "affected",
"version": "\u003c 0.5.0"
}
]
},
{
"product": "orchard",
"vendor": "zcash",
"versions": [
{
"status": "affected",
"version": "\u003c 0.14.0"
}
]
},
{
"product": "librustzcash",
"vendor": "zcash",
"versions": [
{
"status": "affected",
"version": "\u003c 0.28.0"
}
]
},
{
"product": "zcash",
"vendor": "zcash",
"versions": [
{
"status": "affected",
"version": "\u003c 6.20.0"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad 5.0.0, halo2_gadgets 0.5.0, orchard 0.14.0, zcash_primitives 0.28.0, and zcashd 6.20.0, the variable-base scalar multiplication gadget in halo2_gadgets/src/ecc/chip/mul/incomplete.rs used assign_advice() for the base point without a copy constraint tying it to the actual base, allowing a malicious prover to produce a valid proof for an Orchard Action with an under-constrained base point and bypass the diversified-address-integrity check that binds pk_d, g_d, ivk, the nullifier (nf), and the spend validating key (ak) to the note being spent. This issue is fixed in zebrad 5.0.0, halo2_gadgets 0.5.0, orchard 0.14.0, zcash_primitives 0.28.0, and zcashd 6.20.0."
}
],
"id": "CVE-2026-54496",
"lastModified": "2026-07-17T18:45:20.713",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 4.7,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-54496",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-17T17:23:34.445671Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-17T17:17:16.620",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/ZcashFoundation/zebra/releases/tag/v5.0.0"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-ww9q-8r59-xv46"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/zcash/halo2/releases/tag/halo2_gadgets-0.5.0"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/zcash/librustzcash/releases/tag/zcash_primitives-0.28.0"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/zcash/orchard/releases/tag/0.14.0"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/zcash/zcash/releases/tag/v6.20.0"
},
{
"source": "security-advisories@github.com",
"url": "https://zfnd.org/zebra-4-5-3-and-5-0-0-emergency-soft-fork-and-nu6-2-activation"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-345"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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