{"affected":[{"product":"snark-verifier","source":"CNA: GitHub_M","vendor":"axiom-crypto","versions":[{"status":"affected","version":"< 0.2.5"}]}],"cveId":"CVE-2026-62337","cwes":["CWE-20"],"description":"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.","epss":{"date":"2026-11-02","percentile":0.2288,"score":0.00301},"exploits":[],"kev":null,"metrics":[{"score":6.9,"severity":"medium","source":"CNA: GitHub_M","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"}],"modifiedAt":1793631517998,"publishedAt":1793390455328,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/axiom-crypto/snark-verifier/security/advisories/GHSA-x26x-7f4v-cqx7"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/axiom-crypto/halo2-lib/commit/f53be0939e2accf0dd7672b1a4abe80af73dadf3"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/axiom-crypto/snark-verifier/commit/bbfcc721d714bea0d44a27c8fc6c4736e73ca853"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/axiom-crypto/snark-verifier/releases/tag/v0.2.5"}],"remediation":[],"revision":"0117e232e30f17f7db97ac5aade7b47d6d544d861890d979ad6ac4d8a2a6a5d4","sources":[{"modifiedAt":1793631517998,"name":"CNA: GitHub_M","retrievedAt":1793632146751,"url":"https://www.cve.org/CVERecord?id=CVE-2026-62337"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793632151113,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-62337"}],"ssvc":{"assessedAt":1793631504604,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"SNARK Verifier: Halo 2 aggregation mishandles point-at-infinity proof elements","updatedAt":1793632151113}