CVE ID :CVE-2026-55734<\/p>\n
Published : Aug. 1, 2026, 7:16 p.m. | 33\u00a0minutes ago<\/p>\n
Description :Allocation of Resources Without Limits or Throttling vulnerability in ueberauth guardian (Guardian.Permissions module) allows a denial of service via BEAM atom-table exhaustion.<\/p>\n
This vulnerability is associated with program file lib\/guardian\/permissions.ex and program routines ‘Elixir.Guardian.Permissions’:encode_permissions!\/1, ‘Elixir.Guardian.Permissions’:encode_permissions_into_claims!\/2, ‘Elixir.Guardian.Permissions’:do_encode_permissions!\/2.<\/p>\n
The Guardian.Permissions mixin installs a public encode_permissions!\/1 function on every module that does use Guardian.Permissions. For each key of the supplied map, encode_permissions!\/1 calls String.to_atom(to_string(k)) before any validation runs. The integer-value clause of do_encode_permissions!\/2 then short-circuits straight to encoding without validating the key against the configured permission set, so a key with an integer value is interned as a fresh atom with no exception raised. Atoms are never garbage collected and the BEAM atom table is a fixed-size resource (default roughly 1,048,576 entries), so each unique attacker-chosen key permanently consumes one slot. An attacker who can influence a permission map that reaches encode_permissions!\/1 (for example a permissions map read from a request body and passed into token issuance via encode_permissions_into_claims!\/2) can mint an unbounded number of atoms and exhaust the atom table, crashing the entire BEAM node and every service running on it. The sibling decode_permissions\/1 is not affected because it skips keys absent from the configured permission set.<\/p>\n
This issue affects guardian: from 2.0.0 before 2.4.1.<\/p>\n
Severity: 6.9 | MEDIUM<\/p>\n
Visit the link for more details, such as CVSS details, affected products, timeline, and more…\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
CVE ID :CVE-2026-55734 Published : Aug. 1, 2026, 7:16 p.m. | 33\u00a0minutes ago Description :Allocation of Resources Without Limits or Throttling vulnerability in ueberauth guardian (Guardian.Permissions module) allows a denial of service via BEAM atom-table exhaustion. This vulnerability is associated with program file lib\/guardian\/permissions.ex and program routines ‘Elixir.Guardian.Permissions’:encode_permissions!\/1, ‘Elixir.Guardian.Permissions’:encode_permissions_into_claims!\/2, ‘Elixir.Guardian.Permissions’:do_encode_permissions!\/2. The Guardian.Permissions mixin installs a …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82861","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82861"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82861\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}