CVE-2026-21619

UNKNOWN 0.0

Unsafe Deserialization of Erlang Terms in hex_core

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

14th

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.

CWE	CWE-400 CWE-502
Vendor	hexpm
Product	hex_core
Published	Feb 27, 2026
Last Updated	Apr 6, 2026

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Affected Versions

hexpm / hex_core

eb327f8edfe45507351e38cc0805aa12fa647f0b < cdf726095bca85ad2549d146df1e831ae93c2b13

hexpm / hex_core

0.1.0 < 0.12.1

hexpm / hex

314546ac432229518714cc8e3336e916b9da6305 < 636739f3322514e9303ca335fb630696fcbb3c95

hexpm / hex

2.3.0 < 2.3.2

erlang / rebar3

209c02ec57c2cc3207ee0174c3af3675b8dc8f79 < 1d4478f527e373de0b225951e53115450e0d9b9d

erlang / rebar3

3.9.1 < 3.27.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/hexpm/hex_core/security/advisories/GHSA-hx9w-f2w9-9g96 cna.erlef.org: https://cna.erlef.org/cves/CVE-2026-21619.html osv.dev: https://osv.dev/vulnerability/EEF-CVE-2026-21619 github.com: https://github.com/hexpm/hex_core/commit/cdf726095bca85ad2549d146df1e831ae93c2b13 github.com: https://github.com/hexpm/hex/commit/636739f3322514e9303ca335fb630696fcbb3c95 github.com: https://github.com/erlang/rebar3/commit/1d4478f527e373de0b225951e53115450e0d9b9d

Credits

Michael Lubas / Paraxial.ia Jonatan Männchen / EEF Eric Meadows-Jönsson / Hex.pm