{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-46654: Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-46654","status":"final","version":"1","initial_release_date":"2026-06-10T20:06:10.554Z","current_release_date":"2026-06-11T14:01:57.462Z","revision_history":[{"date":"2026-06-10T20:06:10.554Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Plonky3 is a toolkit for polynomial IOPs (PIOPs). Prior to versions 0.4.3 and 0.5.3, an attacker controlling prover-side observations can craft distinct transcripts that produce identical challenges, breaking the binding property of Fiat-Shamir. This issue has been patched in versions 0.4.3 and 0.5.3.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-46654 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-46654"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-46654"},{"category":"external","summary":"https://github.com/Plonky3/Plonky3/security/advisories/GHSA-vj64-rjf3-w3v7","url":"https://github.com/Plonky3/Plonky3/security/advisories/GHSA-vj64-rjf3-w3v7"}]},"product_tree":{"branches":[{"category":"vendor","name":"Plonky3","branches":[{"category":"product_name","name":"Plonky3","branches":[{"category":"product_version","name":"< 0.4.3","product":{"name":"Plonky3 Plonky3 < 0.4.3","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:plonky3:plonky3:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 0.5.0, < 0.5.3","product":{"name":"Plonky3 Plonky3 >= 0.5.0, < 0.5.3","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:plonky3:plonky3:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-46654","title":"Plonky3 MultiField32Challenger: transcript malleability and challenge entropy loss","notes":[{"category":"description","text":"Plonky3 is a toolkit for polynomial IOPs (PIOPs). Prior to versions 0.4.3 and 0.5.3, an attacker controlling prover-side observations can craft distinct transcripts that produce identical challenges, breaking the binding property of Fiat-Shamir. This issue has been patched in versions 0.4.3 and 0.5.3.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","baseScore":8.9,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2"]}]}]}