CVE-2026-105270highCWE-770

CVE-2026-105270: high-severity vulnerability in arekinath esaml

Unbounded atom creation while parsing SAML messages in esaml allows atom table exhaustion

Published · Updated

Follow this CVE+ Monitor esaml+ Monitor esaml

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.7epss 0.5%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
arekinath · esamldropbox · esamlhandnot2 · esaml
Related CVEs — arekinath esaml

In the same product, most dangerous first.

CVE-2026-93471HIGHUnbounded SAML message decompression in esaml allows memory exhaustionEPSS 0.7%CVE-2026-86696HIGHUnbounded atom creation from unsigned LogoutResponse status codes in esaml allows atom table exhaustionEPSS 0.7%CVE-2026-28809MEDIUMXXE in esaml SAML library allows local file read and potential SSRFEPSS 0.3%