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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History

Thu, 22 Oct 2026 07:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Unbounded atom creation from unsigned LogoutResponse status codes in esaml allows atom table exhaustion
First Time appeared Arekinath
Arekinath esaml
Dropbox
Dropbox esaml
Handnot2
Handnot2 esaml
Weaknesses CWE-770
CPEs cpe:2.3:a:arekinath:esaml:*:*:*:*:*:*:*:*
cpe:2.3:a:dropbox:esaml:*:*:*:*:*:*:*:*
cpe:2.3:a:handnot2:esaml:*:*:*:*:*:*:*:*
Vendors & Products Arekinath
Arekinath esaml
Dropbox
Dropbox esaml
Handnot2
Handnot2 esaml
References
Metrics cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: EEF

Published:

Updated: 2026-10-22T06:59:07.680Z

Reserved: 2026-10-08T13:45:02.138Z

Link: CVE-2026-86696

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-22T09:17:16.570

Modified: 2026-10-22T09:17:16.570

Link: CVE-2026-86696

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-22T08:45:02Z

Weaknesses