---
title: "CVE-2026-86696: Dropbox esaml - Denial of Service"
description: "Dropbox esaml from 0.1.0 contains an allocation of resources without limits or throttling vulnerability caused by unchecked creation of atoms from unsigned LogoutResponse status codes, letting unauthenticated attackers exhaust the Erlang VM atom table and crash the node, exploit requires sending many distinct unsigned LogoutResponse messages."
url: https://panop.io/threat-heartbeat/CVE-2026-86696/
---

# CVE-2026-86696 Dropbox esaml - Denial of Service

Dropbox esaml from 0.1.0 contains an allocation of resources without limits or throttling vulnerability caused by unchecked creation of atoms from unsigned LogoutResponse status codes, letting unauthenticated attackers exhaust the Erlang VM atom table and crash the node, exploit requires sending many distinct unsigned LogoutResponse messages.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.44% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-86696)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-770](https://cwe.mitre.org/data/definitions/770.html)

## Vendor fix

Update to the latest version with proper atom creation limits or signature verification.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-86696](https://nvd.nist.gov/vuln/detail/CVE-2026-86696)
- [https://github.com/handnot2/esaml/commit/be692b56245071899757afa7ef47e43593d3de96](https://github.com/handnot2/esaml/commit/be692b56245071899757afa7ef47e43593d3de96)
- [https://osv.dev/vulnerability/EEF-CVE-2026-86696](https://osv.dev/vulnerability/EEF-CVE-2026-86696)
- [https://cna.erlef.org/cves/CVE-2026-86696.html](https://cna.erlef.org/cves/CVE-2026-86696.html)
- [https://github.com/arekinath/esaml/commit/be692b56245071899757afa7ef47e43593d3de96](https://github.com/arekinath/esaml/commit/be692b56245071899757afa7ef47e43593d3de96)
- [https://github.com/dropbox/esaml/commit/be692b56245071899757afa7ef47e43593d3de96](https://github.com/dropbox/esaml/commit/be692b56245071899757afa7ef47e43593d3de96)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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