CVE-2026-62337 (GCVE-0-2026-62337)
Vulnerability from cvelistv5 – Published: 2026-10-30 20:00 – Updated: 2026-11-02 14:58
VLAI
EPSS
VEX
Title
SNARK Verifier: Halo 2 aggregation mishandles point-at-infinity proof elements
Summary
SNARK Verifier is a generic (S)NARK verifier. Prior to 0.2.5, the Halo 2 aggregation circuit can mishandle proof points encoded as the point at infinity. `EcPointLoader::multi_scalar_multiplication` places a `Value::Assigned(_)` base paired with `Value::Constant(ONE)` into its unscaled variable-base list and passes it directly to `sum_with_const`. The default shim delegates to halo2-lib `EccChip::sum`, whose incomplete affine addition assumes nonidentity input points. A prover-controlled proof point encoded as `(0, 0)` can therefore enter the final aggregation sum through the scalar-one shortcut and affect the MSM or accumulator computation. Practical exploitability depends on the surrounding aggregation and final-decider checks; the advisory does not establish universal acceptance of invalid proofs. This issue is fixed in version 0.2.5.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 14:58 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/axiom-crypto/snark-verifier/se… | x_refsource_CONFIRM |
| https://github.com/axiom-crypto/halo2-lib/commit/… | x_refsource_MISC |
| https://github.com/axiom-crypto/snark-verifier/co… | x_refsource_MISC |
| https://github.com/axiom-crypto/snark-verifier/re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| axiom-crypto | snark-verifier |
Affected:
< 0.2.5
|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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