Live › vulnerability › CVE-2026-86696
Go to dashboardesaml, a SAML service provider library for Erlang, turns each distinct unrecognized status value in an unsigned LogoutResponse into a permanent atom. An unauthenticated attacker can exhaust the Erlang VM atom table and crash the node.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Applications that use esaml as a SAML service provider and expose its single-logout endpoint to untrusted clients are exposed, because unsigned LogoutResponse messages reach the atom-creating code path. Services that do not use esaml, or that do not expose the logout endpoint publicly, are less exposed. The sources do not say whether any particular deployment setting blocks the path.
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Allocation of Resources Without Limits or Throttling vulnerability in esaml in dropbox esaml allows an unauthenticated attacker to exhaust the Erlang VM atom table and crash the node via unsigned LogoutResponse messages.
esaml:status_code_map/1 in src/esaml.erl maps any StatusCode value it does not recognize to an atom with list_to_atom/1 on the last colon-separated segment of the URN. esaml_sp:validate_logout_response/2 verifies a signature only when the message carries one, so an unsigned LogoutResponse posted to the single-logout endpoint reaches esaml:decode_logout_response/1 and mints one permanent atom per distinct status value. Atoms are never reclaimed and the VM caps the atom table at about one million entries, so an attacker who posts that many distinct values aborts the node.
This issue affects esaml: from 0.1.0 onward.
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