Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in hexpm hex_core allows an untrusted repository mirror, or a server answering hex_core's API requests, to exhaust the memory of the Erlang VM running hex_core. The same code is vendored in Hex (mix_hex_repo, mix_hex_api) and rebar3 (r3_hex_repo, r3_hex_api). hex_repo:get_names/1, hex_repo:get_versions/1, hex_repo:get_package/2 and hex_repo:get_policy/2 decompress the registry response with zlib:gunzip/1 and decode the signed envelope before verifying its signature. A mirror doesn't have the repository's private key, but it chooses the compressed bytes, so a small response decompresses into an envelope of any size before the signature check rejects it. hex_api decodes responses with the application/vnd.hex+erlang content type through hex_safe_binary_to_term:safe_binary_to_term/1, which calls binary_to_term(Binary, [safe]). The safe option prevents atom creation, but it accepts compressed terms and doesn't limit the size of the decoded term, and the check that rejects functions and ports runs after the term has been built. The fix for CVE-2026-21619 added the safe option and that check without bounding the decoded size. This issue affects rebar3: from 3.9.1 before 3.27.3; hex: from 2.1.0 before 2.5.2 and from 2.6.0 onward; hex_core: from 0.1.0 before 0.20.0.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-b300043748 advisory.

    hex_core ver. 0.21.1

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-b514ab4cac advisory.

    hex_core ver. 0.21.1

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in hexpm hex_core allows an     untrusted repository mirror, or a server answering hex_core's API requests, to exhaust the memory of the     Erlang VM running hex_core. The same code is vendored in Hex (mix_hex_repo, mix_hex_api) and rebar3     (r3_hex_repo, r3_hex_api). hex_repo:get_names/1, hex_repo:get_versions/1, hex_repo:get_package/2 and     hex_repo:get_policy/2 decompress the registry response with zlib:gunzip/1 and decode the signed envelope     before verifying its signature. A mirror doesn't have the repository's private key, but it chooses the     compressed bytes, so a small response decompresses into an envelope of any size before the signature check     rejects it. hex_api decodes responses with the application/vnd.hex+erlang content type through     hex_safe_binary_to_term:safe_binary_to_term/1, which calls binary_to_term(Binary, [safe]). The safe option     prevents atom creation, but it accepts compressed terms and doesn't limit the size of the decoded term,     and the check that rejects functions and ports runs after the term has been built. The fix for     CVE-2026-21619 added the safe option and that check without bounding the decoded size. This issue affects     rebar3: from 3.9.1 before 3.27.3; hex: from 2.1.0 before 2.5.2 and from 2.6.0 onward; hex_core: from 0.1.0     before 0.20.0. (CVE-2026-105274)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
375409	Fedora 44 : erlang-hex_core (2026-b300043748)	Nessus	Fedora Local Security Checks	Local	medium
375400	Fedora 45 : erlang-hex_core (2026-b514ab4cac)	Nessus	Fedora Local Security Checks	Local	medium
365735	Linux Distros Unpatched Vulnerability : CVE-2026-105274	Nessus	Misc.	Local	low

Detections

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CVE-2026-105274

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Tenable Plugins

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medium

low