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CVE-2026-61618
SNARK Verifier is a generic (S)NARK verifier. Prior to 0.2.5, KZG accumulator public-instance limbs are decoded without consistently enforcing canonical limb bounds before elliptic-curve coordinate reconstruction. PlonkProof::read selects scalars using accumulator_indices and passes them to AccumulatorEncoding::from_repr. For the EVM loader, LimbsEncoding::from_repr forwards them to EvmLoader::ec_point_from_limbs in snark-verifier/src/loader/evm/loader.rs, where shl and add reconstruct coordinates before validate_ec_point checks the resulting affine point rather than the original limb bounds. The related native path in snark-verifier/src/pcs/kzg/accumulator.rs can reach assertion- or unwrap-based decoding and panic instead of returning a verification error. This allows noncanonical encodings at the verifier boundary and can crash the native verifier. Standard SDK aggregation circuits are expected to constrain accumulator limbs before this boundary, which limits practical exploitability. This issue is fixed in version 0.2.5.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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