CVE-2026-54496

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Source
https://cve.org/CVERecord?id=CVE-2026-54496
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54496.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54496
Aliases
Published
2026-07-17T16:59:06Z
Modified
2026-08-12T03:51:19Z
Severity
  • 9.3 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L CVSS Calculator
Summary
Missing copy constraint in halo2_gadgets variable-base scalar multiplication allows under-constrained base, breaking Orchard Action circuit soundness
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54496.json"
}
References

Affected packages

Git / github.com/zcash/halo2

Affected ranges

Type
GIT
Repo
https://github.com/zcash/halo2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d751768afe0d2105b349dd93f73fde7f2eade088
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.5.0"
        }
    ],
    "source": "AFFECTED_FIELD"
}
Type
GIT
Repo
https://github.com/zcash/librustzcash
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d0c380114a88154fad05d92a168a546a4ab219e2
Fixed
8766e0532a793516c27ad2f838bccfbb24d47285
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.14.0"
        },
        {
            "fixed": "0.28.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}
Type
GIT
Repo
https://github.com/zcash/orchard
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8de172448be10f3a470f9ac83198dc8a185986ad
Database specific
Show details 
{
    "source": "REFERENCES"
}
Type
GIT
Repo
https://github.com/zcash/zcash
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
6966f30a8541b0e5998837dce14250ca9e15b16a
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "6.20.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}
Type
GIT
Repo
https://github.com/zcashfoundation/zebra
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
1e6519ea91e2d3035c20aadd4d9a40dcac2eed3a
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "5.0.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.1.0
0.2.0
0.3.0
0.4.0
0.5.0
4.*
4.3.1
bitcoin-v0.*
bitcoin-v0.11.2
Other
ecc_sdk-20240129
ecc_sdk-20240130a
github_releases_tombstone
f4jumble-0.*
f4jumble-0.1.0
halo2_gadgets-0.*
halo2_gadgets-0.1.0
halo2_gadgets-0.2.0
halo2_gadgets-0.3.0
halo2_gadgets-0.4.0
halo2_proofs-0.*
halo2_proofs-0.1.0
halo2_proofs-0.2.0
halo2_proofs-0.3.0
v0.*
v0.1.0-beta.1
v0.1.0-beta.2
v0.1.0-beta.3
v0.11.2.z0
v0.11.2.z1
v0.11.2.z2
v0.11.2.z3
v0.11.2.z4
v0.11.2.z5
v0.11.2.z6
v0.11.2.z7
v0.11.2.z8
v0.11.2.z9
v0.9.0rc2
v1.*
v1.0.0
v1.0.0-alpha.0
v1.0.0-alpha.1
v1.0.0-alpha.10
v1.0.0-alpha.11
v1.0.0-alpha.12
v1.0.0-alpha.13
v1.0.0-alpha.14
v1.0.0-alpha.15
v1.0.0-alpha.16
v1.0.0-alpha.17
v1.0.0-alpha.18
v1.0.0-alpha.19
v1.0.0-alpha.2
v1.0.0-alpha.3
v1.0.0-alpha.4
v1.0.0-alpha.5
v1.0.0-alpha.6
v1.0.0-alpha.7
v1.0.0-alpha.8
v1.0.0-alpha.9
v1.0.0-beta.0
v1.0.0-beta.1
v1.0.0-beta.10
v1.0.0-beta.11
v1.0.0-beta.12
v1.0.0-beta.13
v1.0.0-beta.14
v1.0.0-beta.15
v1.0.0-beta.2
v1.0.0-beta.3
v1.0.0-beta.4
v1.0.0-beta.5
v1.0.0-beta.6
v1.0.0-beta.7
v1.0.0-beta.8
v1.0.0-beta.9
v1.0.0-beta1
v1.0.0-beta2
v1.0.0-rc.0
v1.0.0-rc.1
v1.0.0-rc.2
v1.0.0-rc.3
v1.0.0-rc.4
v1.0.0-rc.5
v1.0.0-rc.6
v1.0.0-rc.7
v1.0.0-rc.8
v1.0.0-rc.9
v1.0.0-rc1
v1.0.0-rc2
v1.0.0-rc3
v1.0.0-rc4
v1.0.1
v1.0.10
v1.0.10-1
v1.0.11
v1.0.11-rc1
v1.0.12
v1.0.12-rc1
v1.0.13
v1.0.13-rc1
v1.0.13-rc2
v1.0.14
v1.0.14-rc1
v1.0.15
v1.0.15-rc1
v1.0.2
v1.0.3
v1.0.4
v1.0.5
v1.0.6
v1.0.7-1
v1.0.8
v1.0.8-1
v1.0.9
v1.1.0
v1.1.0-rc1
v1.1.1
v1.1.1-rc1
v1.1.1-rc2
v1.1.2
v1.1.2-rc1
v1.2.0
v1.3.0
v1.4.0
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.6.1
v1.7.0
v1.8.0
v1.9.0
v2.*
v2.0.0
v2.0.0-rc.0
v2.0.0-rc1
v2.0.1
v2.0.1-rc1
v2.0.2
v2.0.2-rc1
v2.0.3
v2.0.3-rc1
v2.0.4
v2.0.4-rc1
v2.0.5
v2.0.5-1
v2.0.5-2
v2.0.5-rc1
v2.0.6
v2.0.6-rc1
v2.0.7
v2.0.7-2
v2.0.7-rc1
v2.1.0
v2.1.0-rc1
v2.1.1
v2.1.1-rc1
v2.1.1-rc2
v2.1.2
v2.1.2-rc1
v2.2.0
v2.3.0
v2.4.0
v2.4.2
v2.5.0
v3.*
v3.0.0
v3.0.0-rc.0
v3.0.0-rc1
v3.1.0
v3.1.0-rc1
v3.1.0-rc2
v4.*
v4.0.0
v4.0.0-rc1
v4.1.0
v4.1.0-rc1
v4.1.1
v4.2.0
v4.2.0-rc1
v4.3.0
v4.3.0-rc1
v4.3.1
v4.4.0
v4.4.0-rc1
v4.4.1
v4.4.1-rc1
v4.5.0
v4.5.0-rc1
v4.5.1
v4.6.0
v4.6.0-rc1
v4.7.0
v4.7.0-rc1
v5.*
v5.1.0-rc1
v5.3.0-gitian
zc.*
zc.v0.11.2.z0
zcash_address-0.*
zcash_address-0.1.0
zcash_address-0.2.0
zcash_address-0.2.1
zcash_client_backend-0.*
zcash_client_backend-0.5.0
zcash_client_backend-0.6.0
zcash_client_backend-0.6.1
zcash_client_backend-0.7.0
zcash_client_backend-0.8.0
zcash_client_backend-0.9.0
zcash_client_sqlite-0.*
zcash_client_sqlite-0.3.0
zcash_client_sqlite-0.4.0
zcash_client_sqlite-0.4.1
zcash_client_sqlite-0.4.2
zcash_client_sqlite-0.5.0
zcash_client_sqlite-0.6.0
zcash_client_sqlite-0.7.0
zcash_encoding-0.*
zcash_encoding-0.1.0
zcash_encoding-0.2.0
zcash_history-0.*
zcash_history-0.3.0
zcash_note_encryption-0.*
zcash_note_encryption-0.3.0
zcash_primitives-0.*
zcash_primitives-0.10.0
zcash_primitives-0.10.1
zcash_primitives-0.10.2
zcash_primitives-0.11.0
zcash_primitives-0.14.0
zcash_primitives-0.5.0
zcash_primitives-0.6.0
zcash_primitives-0.8.0
zcash_primitives-0.8.1
zcash_primitives-0.9.0
zcash_primitives-0.9.1
zcash_proofs-0.*
zcash_proofs-0.10.0
zcash_proofs-0.11.0
zcash_proofs-0.5.0
zcash_proofs-0.6.0
zcash_proofs-0.8.0
zcash_proofs-0.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54496.json"