Threats affecting pkg:hex/absinthe

CVE-2026-42793 is a high-severity vulnerability in absinthe-graphql absinthe versions from 1.5.0 before 1.10.2. It allows unauthenticated denial of service via exhaustion of the Erlang VM atom table when parsing attacker-controlled GraphQL SDL documents. The vulnerability arises because Absinthe's SDL parser converts many unique names into atoms without limits, and atoms are never garbage collected, leading to a fixed-size atom table exhaustion and node crash. Any application that parses untrusted GraphQL SDL input is vulnerable, such as schema-upload endpoints or federation gateways. No official patch or remediation guidance is currently confirmed.

Inefficient Algorithmic Complexity vulnerability in absinthe-graphql absinthe allows unauthenticated denial of service via quadratic fragment-name uniqueness validation. 'Elixir.Absinthe.Phase.Document.Validation.UniqueFragmentNames':run/2 iterates over all fragments and for each one calls duplicate?/2, which evaluates Enum.count(fragments, &(&1.name == name)) — a full linear scan of the fragment list. The result is O(N²) comparisons per document, where N is the number of fragment definitions supplied by the caller. Because input.fragments is built directly from the GraphQL query body, N is fully attacker-controlled. A minimum-size fragment definition is roughly 16 bytes, so a ~1 MB document carries ~60,000 fragments and forces ~3.6 × 10⁹ comparisons inside this single validation phase. No authentication, schema knowledge, or special configuration is required. This issue affects absinthe: from 1.2.0 before 1.10.2.