CVE Watch30 de out. de 2026

CVE-2026-93471

Improper Handling of Highly Compressed Data (Data Amplification) in esaml_binding in dropbox esaml allows an unauthenticated attacker to exh

CVSS

—

Sem CVSS

EPSS

0.7%

p52

KEV

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Exploit Today

0-100

Publicado: 22 de out. de 2026 · Última mod.: 30 de out. de 2026 · CWE-409

EPSS · 30d

0.4%EPSS · 30 dias0.7%

2026-10-222026-11-07

Descrição técnica

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. esaml_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. This issue affects esaml: from 0.1.0 onward.

Referências oficiais

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