CVE-2026-55733— ueberauth Guardian 资源管理错误漏洞

Atom-table exhaustion denial of service in Guardian permissions AtomEncoding via unbounded atom creation

Allocation of Resources Without Limits or Throttling in ueberauth guardian allows denial of service via unbounded atom creation from attacker-controlled binary input. Guardian.Permissions.AtomEncoding encodes permission scopes by passing arbitrary binaries to String.to_atom/1. When encode/3 in lib/guardian/permissions/atom_encoding.ex is called with a list, each binary entry is handled by the encode_value/3 binary clause, which calls String.to_atom(value) with no allow-list check. The perm_set argument (the application's small, finite set of legitimate permission names) is discarded, so any external string flows straight into atom creation. This encoder is selected with use Guardian.Permissions, encoding: Guardian.Permissions.AtomEncoding and reached through the imported encode/3 entry point. String.to_atom/1 creates a brand-new atom for every previously unseen binary, atoms are never garbage collected, and the BEAM atom table is fixed at roughly 1,048,576 entries by default. An application that funnels attacker-influenced permission scopes (from a request body, a JWT claim, or other external input) into encode/3 therefore mints one permanent atom per distinct value. A modest stream of varied, unauthenticated input permanently consumes the atom table and crashes the BEAM node with system_limit, taking down every application running on it. The default encoder is Guardian.Permissions.BitwiseEncoding, which is not affected. This issue affects guardian: from 2.0.0 before 2.4.1.

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

不加限制或调节的资源分配

ueberauth Guardian 资源管理错误漏洞

ueberauth Guardian是ueberauth组织开源的一个基于令牌的身份验证库，可用于 Elixir 应用程序。 ueberauth Guardian 2.0.0至2.4.1之前版本存在资源管理错误漏洞，该漏洞源于AtomEncoding编码器未对权限范围进行限制，将攻击者控制的二进制输入直接传递给String.to_atom/1创建原子，导致无限制的原子创建，可能造成拒绝服务。

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