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Back to active CVEs
High · CVSS 8.2CVE-2026-86696

Unbounded atom creation from unsigned LogoutResponse status codes in esaml allows atom table exhaustionCVE-2026-86696

Answer in brief

CVE-2026-86696 records a High severity (CVSS 8.2) vulnerability in Unbounded atom creation from unsigned LogoutResponse status codes in esaml allows atom table exhaustion. The current sources do not mark it as known exploited. The current feed maps arekinath/arekinath/esaml (generic), dropbox/dropbox/esaml (generic), dropbox/esaml (generic), handnot2/handnot2/esaml (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 22, 2026Updated Oct 22, 2026Source checked Oct 22, 2026First seen by HOL Oct 22, 2026Material review Oct 22, 2026
Upstream Advisory

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Oct 22, 2026
References
5 linked sources
Open source record

Key facts

Risk
High · CVSS 8.2
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps arekinath/arekinath/esaml (generic), dropbox/dropbox/esaml (generic), dropbox/esaml (generic), handnot2/handnot2/esaml (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
arekinath/arekinath/esamlgeneric>=be692b56245071899757afa7ef47e43593d3de96 <**
dropbox/dropbox/esamlgeneric>=be692b56245071899757afa7ef47e43593d3de96 <**
dropbox/esamlgeneric>=0.1.0 <**
handnot2/handnot2/esamlgeneric>=be692b56245071899757afa7ef47e43593d3de96 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for arekinath/arekinath/esaml, dropbox/dropbox/esaml, dropbox/esaml.
  2. 2Review the reported fix. Update arekinath/arekinath/esaml to *; dropbox/dropbox/esaml to *; dropbox/esaml to *; handnot2/handnot2/esaml to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 22, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Unbounded atom creation while parsing SAML messages in esaml allows atom table exhaustionSame arekinath/arekinath/esaml package
  • Unbounded SAML message decompression in esaml allows memory exhaustionSame arekinath/arekinath/esaml package