CVE-2026-54496 (GCVE-0-2026-54496)
Vulnerability from cvelistv5 – Published: 2026-07-17 16:59 – Updated: 2026-07-17 17:23
VLAI
EPSS
VEX
Title
Missing copy constraint in halo2_gadgets variable-base scalar multiplication allows under-constrained base, breaking Orchard Action circuit soundness
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.
Severity
9.3 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 17:23 UTC
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
GitHub_M
CNA
References
7 references
| URL | Tags |
|---|---|
| https://github.com/ZcashFoundation/zebra/security… | x_refsource_CONFIRM |
| https://github.com/ZcashFoundation/zebra/releases… | x_refsource_MISC |
| https://github.com/zcash/halo2/releases/tag/halo2… | x_refsource_MISC |
| https://github.com/zcash/librustzcash/releases/ta… | x_refsource_MISC |
| https://github.com/zcash/orchard/releases/tag/0.14.0 | x_refsource_MISC |
| https://github.com/zcash/zcash/releases/tag/v6.20.0 | x_refsource_MISC |
| https://zfnd.org/zebra-4-5-3-and-5-0-0-emergency-… | x_refsource_MISC |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| ZcashFoundation | zebra |
Affected:
< 5.0.0
|
|
| zcash | halo2_gadgets |
Affected:
< 0.5.0
|
|
| zcash | orchard |
Affected:
< 0.14.0
|
|
| zcash | librustzcash |
Affected:
< 0.28.0
|
|
| zcash | zcash |
Affected:
< 6.20.0
|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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