{"schema":"threatline.record/2","record":{"id":"CVE-2026-65631","aliases":["GHSA-3m45-vrpj-xmrq"],"summary":"erlang-jose RSA JWK parsing attempts to factor an attacker-controlled modulus, enabling CPU-exhaustion denial of service","details":"Inefficient Algorithmic Complexity in erlang-jose allows an unauthenticated remote attacker to cause a CPU-exhaustion denial of service by submitting a crafted RSA JSON Web Key.\n\nWhen an application parses an untrusted JWK through the public jose_jwk:from_binary/1 or jose_jwk:from_map/1 API (or the Elixir wrappers JOSE.JWK.from_binary/1 and JOSE.JWK.from_map/1), an RSA private key that supplies d, e, and n but omits all Chinese Remainder Theorem parameters (p, q, dp, dq, qi) is routed into convert_sfm_to_crt/1, which tries to recover the missing primes by factoring the modulus. The three integers are read straight from the base64url input and are never validated as a real RSA key. When the modulus cannot be split into two factors (for example, when it is itself prime), the search loop convert_sfm_to_crt_find_p/6 performs a modular exponentiation over the attacker-sized modulus on every iteration and never succeeds. A single request of a few hundred bytes forces close to one CPU-second of work before an internal one-second watchdog kills the worker, and a larger modulus raises the cost further. By flooding such requests an attacker can saturate every scheduler and deny service, without credentials, a valid RSA key, or any special configuration.\n\nThis issue affects jose: from 1.7.7 before 1.11.13.","categories":["Unclassified"],"product":"jose","vendor":"potatosalad","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-65631","source_modified_at":"2026-10-26T19:53:45.204Z","fetched_at":"2026-10-26T23:45:56.352924Z","product":"jose","vendor":"potatosalad","versions":[{"lessThan":"1.11.13","status":"affected","version":"1.7.7","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-65631","source_modified_at":"2026-10-26T19:53:45.204Z","fetched_at":"2026-10-26T23:45:56.352924Z","product":"jose","vendor":"potatosalad","versions":[{"lessThan":"bfd336c0062bff93e65d08c22361897e96afd956","status":"affected","version":"d19e1ba68d88c68d29aa942be2573a22dbafca1f","versionType":"git"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-65631","source_modified_at":"2026-10-26T19:53:45.204Z","fetched_at":"2026-10-26T23:45:56.352924Z","package":{"name":"jose","ecosystem":null},"version":"1.11.13","basis":"first unaffected version stated in the CVE record"}],"cvss":6.9,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-26T19:53:45.204Z","modified_at":"2026-10-26T19:53:45.204Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-65631","fetched_at":"2026-10-26T23:45:56.352924Z","source_modified_at":"2026-10-26T19:53:45.204Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/potatosalad/erlang-jose/security/advisories/GHSA-3m45-vrpj-xmrq","tags":["vendor-advisory","related"]},{"source":"CVE List","url":"https://cna.erlef.org/cves/CVE-2026-65631.html","tags":["related"]},{"source":"CVE List","url":"https://osv.dev/vulnerability/EEF-CVE-2026-65631","tags":["related"]},{"source":"CVE List","url":"https://github.com/potatosalad/erlang-jose/commit/d19e1ba68d88c68d29aa942be2573a22dbafca1f","tags":["related"]},{"source":"CVE List","url":"https://github.com/potatosalad/erlang-jose/commit/bfd336c0062bff93e65d08c22361897e96afd956","tags":["patch"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-26T19:53:45.204Z","content_hash":"6b7060a73ce48a2dc1f1f7eca9e282ec68555744d5c376373a881874394d1967"}}