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bdu:2026-15273

EUVD-2026-322088

fkie_cve-2026-21619

Uncontrolled Resource Consumption, Deserialization of Untrusted Data vulnerability in hexpm hex_core (hex_api modules), hexpm hex (mix_hex_api modules), erlang rebar3 (r3_hex_api modules) allows Object Injection, Excessive Allocation. This vulnerability is associated with program files src/hex_api.erl, src/mix_hex_api.erl, apps/rebar/src/vendored/r3_hex_api.erl and program routines hex_core:request/4, mix_hex_api:request/4, r3_hex_api:request/4.

This issue affects hex_core: from 0.1.0 before 0.12.1; hex: from 2.3.0 before 2.3.2; rebar3: from 3.9.1 before 3.27.0.

GHSA-hx9w-f2w9-9g96 — hex_core has Unsafe Deserialization of Erlang Terms

Affected: Hex: hex_core

### Impact

The Hex client (`hex_core`) deserializes Erlang terms received from the Hex API using `binary_to_term/1` without sufficient restrictions.

If an attacker can control the HTTP response body returned by the Hex API, this allows denial-of-service attacks such as **atom table exhaustion**, leading to a VM crash. No released versions are known to allow remote code execution.

### Patches

* https://github.com/hexpm/hex_core/commit/cdf726095bca85ad2549d146df1e831ae93c2b13 * https://github.com/hexpm/hex/commit/636739f3322514e9303ca335fb630696fcbb3c95 * https://github.com/erlang/rebar3/commit/1d4478f527e373de0b225951e53115450e0d9b9d

### Workarounds

Ensure that the Hex API URL (`HEX_API_URL`) points only to trusted endpoints. There is no client-side workaround that fully mitigates this issue without applying the patch.

### Resources

* hex_core Module: https://github.com/hexpm/hex_core/blob/main/src/hex_api.erl * Hex Vendored Module: https://github.com/hexpm/hex/blob/main/src/mix_hex_api.erl * Rebar3 Vendored Module: https://github.com/erlang/rebar3/blob/main/apps/rebar/src/vendored/r3_hex_api.erl * hex_core Patch: https://github.com/hexpm/hex_core/commit/cdf726095bca85ad2549d146df1e831ae93c2b13 * Hex Vendored Patch: https://github.com/hexpm/hex/commit/636739f3322514e9303ca335fb630696fcbb3c95 * Rebar3 Vendored Patch: https://github.com/erlang/rebar3/commit/1d4478f527e373de0b225951e53115450e0d9b9d

UBUNTU-CVE-2026-21619

Affected: Ubuntu:22.04:LTS: rebar3, Ubuntu:24.04:LTS: rebar3, Ubuntu:25.10: rebar3, Ubuntu:26.04:LTS: rebar3