CVE-2026-105270 Unbounded atom creation while parsing SAML messages in esaml allows atom table exhaustion
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-105270?
CVE-2026-105270 is a high-severity vulnerability in arekinath esaml, published on 22 Oct 2026.
Official description
Allocation of Resources Without Limits or Throttling vulnerability in esaml_binding in dropbox esaml allows an unauthenticated attacker to exhaust the Erlang VM atom table and crash the node via a crafted SAMLResponse.
esaml_binding:decode_response/2 parses the decoded SAMLResponse with xmerl_scan:string/2, which interns every element name, attribute name, and namespace prefix it reads as a permanent atom. The SAML consume (ACS) and single-logout endpoints call it on unauthenticated requests before any signature check, so one well-formed document with thousands of distinct names mints thousands of atoms while staying inside the 128 KB request body limit. Atoms are never reclaimed and the VM caps the atom table at about one million entries, so a few dozen requests abort the node.
This issue affects esaml: from 0.1.0 onward.
Weakness: CWE-770
Which versions are affected by CVE-2026-105270?
1 open source package ship an affected version, including esaml.
| Package | Affected | Fixed in |
|---|---|---|
esaml Hex | From 0.1.0 | None |
How do I fix CVE-2026-105270?
No fix has been published for CVE-2026-105270 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-105270 being exploited?
There is no known exploitation of CVE-2026-105270 in the wild and no public exploit code.
Sources
Also known as EEF-CVE-2026-105270, GHSA-6m7w-85hw-3q64.