Unbounded atom creation from unsigned LogoutResponse status codes in esaml allows atom table exhaustion
Impact
esaml from 0.1.0 onward is vulnerable to Allocation of Resources Without Limits or Throttling, allowing an unauthenticated attacker to exhaust the Erlang VM atom table and crash the node via unsigned LogoutResponse messages. The attacker can post distinct status values to the single-logout endpoint. Atoms are never reclaimed, and the VM caps the atom table at about one million entries.
Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.Affected packages
Affected products
Vendor version evidence. Product records are separate from automatic dependency matching.
handnot2 · EEF
esaml
1 range
handnot2 · EEF
esaml
Package identity
pkg:github/handnot2/esamlIdentity supplied by EEF. Version matching requires compatible range evidence.
Compare with this publisher’s ranges. This does not inspect your installation.
affected
be692b56245071899757afa7ef47e43593d3de96 → before *
git versions
Other versions: unaffected
Product identifiers (CPE)
cpe:2.3:a:handnot2:esaml:*:*:*:*:*:*:*:*arekinath · EEF
esaml
1 range
arekinath · EEF
esaml
Package identity
pkg:github/arekinath/esamlIdentity supplied by EEF. Version matching requires compatible range evidence.
Compare with this publisher’s ranges. This does not inspect your installation.
affected
be692b56245071899757afa7ef47e43593d3de96 → before *
git versions
Other versions: unaffected
Product identifiers (CPE)
cpe:2.3:a:arekinath:esaml:*:*:*:*:*:*:*:*dropbox · EEF
esaml
1 range
dropbox · EEF
esaml
Package identity
pkg:hex/esamlExplore esaml →Identity supplied by EEF. Version matching requires compatible range evidence.
Compare with this publisher’s ranges. This does not inspect your installation.
affected
0.1.0 → before *
semver versions
Other versions: unaffected
Product identifiers (CPE)
cpe:2.3:a:dropbox:esaml:*:*:*:*:*:*:*:*dropbox · EEF
esaml
1 range
dropbox · EEF
esaml
Package identity
pkg:github/dropbox/esamlIdentity supplied by EEF. Version matching requires compatible range evidence.
Compare with this publisher’s ranges. This does not inspect your installation.
affected
be692b56245071899757afa7ef47e43593d3de96 → before *
git versions
Other versions: unaffected
Product identifiers (CPE)
cpe:2.3:a:dropbox:esaml:*:*:*:*:*:*:*:*Original 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.
Inside the record
Evidence available
Describes the evidence in this view, not whether the product is safe.
Original records
CVE-2026-86696View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.
cve.new JSON →Underlying weaknesses
The source’s classification of what caused the vulnerability.
Environment requirements
These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.
EEF · platform conditions
All conditions must hold
Any condition may hold
Vulnerable product
cpe:2.3:a:handnot2:esaml:*:*:*:*:*:*:*:*From (inclusive): 2.0.0
Vulnerable product
cpe:2.3:a:dropbox:esaml:*:*:*:*:*:*:*:*From (inclusive): 0.1.0
Original applicability statements
[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:handnot2:esaml:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:dropbox:esaml:*:*:*:*:*:*:*:*",
"versionStartIncluding": "0.1.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
]Contributing organizations · 2
Assigning organization
Additional data publisher
What changed
Follow changesLarge field values are marked as truncated previews. Original source snapshots remain retained.