{"schema":"threatline.record/2","record":{"id":"CVE-2026-93471","aliases":[],"summary":"Unbounded SAML message decompression in esaml allows memory exhaustion","details":"Improper Handling of Highly Compressed Data (Data Amplification) in esaml_binding in dropbox esaml allows an unauthenticated attacker to exhaust server memory and crash the Erlang VM via a crafted compressed SAMLResponse.\n\nesaml_binding:decode_response/2 base64-decodes the attacker-supplied SAMLResponse, inflates it with zlib:unzip/1 with no bound on the output, then converts the result to a charlist with binary_to_list/1 before parsing. This runs on the SAML consume (ACS) and single-logout endpoints, which accept unauthenticated requests by design, and it runs before any signature check. A small deflate stream reaches a compression ratio near 1000 to 1, so a request body of tens of kilobytes inflates to hundreds of megabytes and then to several gigabytes of list heap, so a few requests exhaust memory and take the node down.\n\nThis issue affects esaml: from 0.1.0 onward.","categories":["Unclassified"],"product":"esaml","vendor":"handnot2","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93471","source_modified_at":"2026-10-22T06:59:24.029Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"esaml","vendor":"handnot2","versions":[{"lessThan":"*","status":"affected","version":"deeb84378d5c82153b470e99d24f77c38afca14a","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93471","source_modified_at":"2026-10-22T06:59:24.029Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"esaml","vendor":"arekinath","versions":[{"lessThan":"*","status":"affected","version":"deeb84378d5c82153b470e99d24f77c38afca14a","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93471","source_modified_at":"2026-10-22T06:59:24.029Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"esaml","vendor":"dropbox","versions":[{"lessThan":"*","status":"affected","version":"0.1.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93471","source_modified_at":"2026-10-22T06:59:24.029Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"esaml","vendor":"dropbox","versions":[{"lessThan":"*","status":"affected","version":"deeb84378d5c82153b470e99d24f77c38afca14a","versionType":"git"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":8.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00438,"percentile":0.37052,"score_date":"2026-10-23"},"published_at":"2026-10-22T06:59:24.029Z","modified_at":"2026-10-22T06:59:24.029Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93471","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-22T06:59:24.029Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93471","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://cna.erlef.org/cves/CVE-2026-93471.html","tags":["related","third-party-advisory"]},{"source":"CVE List","url":"https://osv.dev/vulnerability/EEF-CVE-2026-93471","tags":["related"]},{"source":"CVE List","url":"https://github.com/handnot2/esaml/commit/deeb84378d5c82153b470e99d24f77c38afca14a","tags":["related"]},{"source":"CVE List","url":"https://github.com/arekinath/esaml/commit/deeb84378d5c82153b470e99d24f77c38afca14a","tags":["related"]},{"source":"CVE List","url":"https://github.com/dropbox/esaml/commit/deeb84378d5c82153b470e99d24f77c38afca14a","tags":["related","broken-link"]}],"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":"2026-10-22T06:59:24.029Z","content_hash":"8cef699c1829eb497f102e675232c92c69dc74881ce045763444f16127e5761c"}}