{"schema":"threatline.record/2","record":{"id":"CVE-2026-65626","aliases":["GHSA-vwvr-f994-6j9j"],"summary":"Bleichenbacher padding oracle in RSAES-PKCS1-v1_5 decryption in jose","details":"The pure-Erlang RSAES-PKCS1-v1_5 decryption in the jose_jwa_pkcs1 module is a Bleichenbacher padding oracle. eme_pkcs1_decode/2 returns the recovered message when a decrypted block has valid PKCS#1 v1.5 padding (a leading 0x00 0x02, a padding string of at least eight non-zero bytes, and a 0x00 separator) and returns a distinct error result otherwise, and rsaes_pkcs1_decrypt/2 additionally returns {error, {badsize, _}} when the length check fails. The implementation applies no implicit-rejection countermeasure (RFC 8017 §7.2.2): it does not substitute a deterministic pseudo-random plaintext on a padding failure, so a one-bit padding-conformance signal leaks to the caller. Because the underlying modular exponentiation in dp/2 is a raw, non-blinded crypto:mod_pow/3, the padding check also stays distinguishable by timing even when an application normalizes every failure to a single error value.\n\nAn unauthenticated attacker who knows only the public RSA key and can submit ciphertexts to a decryption endpoint that unwraps RSA1_5 JWE keys (or otherwise calls decrypt_private/3 with rsa_pkcs1_padding) can use this oracle to recover the plaintext of intercepted ciphertexts, such as content-encryption keys and thus the protected message, or to forge signatures, through roughly 10^4 to 10^6 adaptive chosen-ciphertext queries.\n\nThis issue affects jose: from 1.3.0 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-2026-65626","source_modified_at":"2026-10-26T19:53:05.620Z","fetched_at":"2026-10-26T23:45:56.352924Z","product":"jose","vendor":"potatosalad","versions":[{"lessThan":"1.11.13","status":"affected","version":"1.3.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-65626","source_modified_at":"2026-10-26T19:53:05.620Z","fetched_at":"2026-10-26T23:45:56.352924Z","product":"jose","vendor":"potatosalad","versions":[{"lessThan":"0eac8cef9aaa48fb6846f4e47a0002dc4a73966d","status":"affected","version":"853c5d4c4c0bd2a7ecb055b237f4284184e176c8","versionType":"git"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-65626","source_modified_at":"2026-10-26T19:53:05.620Z","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"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-65626","source_modified_at":"2026-10-26T19:53:05.620Z","fetched_at":"2026-10-26T23:45:56.352924Z","package":{"name":"jose","ecosystem":null},"version":"0eac8cef9aaa48fb6846f4e47a0002dc4a73966d","basis":"first unaffected version stated in the CVE record"}],"cvss":5.9,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-26T19:53:05.620Z","modified_at":"2026-10-26T19:53:05.620Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-65626","fetched_at":"2026-10-26T23:45:56.352924Z","source_modified_at":"2026-10-26T19:53:05.620Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/potatosalad/erlang-jose/security/advisories/GHSA-vwvr-f994-6j9j","tags":["vendor-advisory","related"]},{"source":"CVE List","url":"https://cna.erlef.org/cves/CVE-2026-65626.html","tags":["related"]},{"source":"CVE List","url":"https://osv.dev/vulnerability/EEF-CVE-2026-65626","tags":["related"]},{"source":"CVE List","url":"https://github.com/potatosalad/erlang-jose/commit/853c5d4c4c0bd2a7ecb055b237f4284184e176c8","tags":["related"]},{"source":"CVE List","url":"https://github.com/potatosalad/erlang-jose/commit/0eac8cef9aaa48fb6846f4e47a0002dc4a73966d","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":"2026-10-26T19:53:05.620Z","content_hash":"662253c98f8af426b8546fe870a2589e21fd6446447ed81a849c0141441812c9"}}