CVE-2026-86696Unbounded atom creation from unsigned LogoutResponse status codes in esaml allows atom table exhaustion
Updated under an hour ago ()
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It affects handnot2 esaml and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.2 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- EEF
- NVD analysis
- Received
- Record last updated
- Oct 22, 2026
- First seen by InfoSec Signals
- Oct 22, 2026
Affected products
handnot2 esaml handnot2:esaml | from be692b56245071899757afa7ef47e43593d3de96 | CNA record |
arekinath esaml arekinath:esaml | from be692b56245071899757afa7ef47e43593d3de96 | CNA record |
dropbox esaml dropbox:esaml | from 0.1.0 | CNA record |
References
- https://cna.erlef.org/cves/CVE-2026-86696.htmlrelated, third-party-advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-86696related
- https://github.com/handnot2/esaml/commit/be692b56245071899757afa7ef47e43593d3de96related
- https://github.com/arekinath/esaml/commit/be692b56245071899757afa7ef47e43593d3de96related
- https://github.com/dropbox/esaml/commit/be692b56245071899757afa7ef47e43593d3de96related, broken-link
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.