Low 2.0Published Feb 27, 2026

CVE-2026-21619Unsafe Deserialization of Erlang Terms in hex_core

Updated under an hour ago (Oct 27, 2026, 12:30 PM ET)

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Every CVE for hexpm hex_core

Exploited in the last 30 days

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.

CVSS: 2.0 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness (CWE): CWE-400, CWE-502
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: EEF
NVD analysis: Modified
Record last updated: May 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

hexpm hex_core hexpm:hex_core	from eb327f8edfe45507351e38cc0805aa12fa647f0b before cdf726095bca85ad2549d146df1e831ae93c2b13	CNA record
hexpm hex hexpm:hex	from 314546ac432229518714cc8e3336e916b9da6305 before 636739f3322514e9303ca335fb630696fcbb3c95	CNA record
erlang rebar3 erlang:rebar3	209c02ec57c2cc3207ee0174c3af3675b8dc8f79 builds before 1d4478f527e373de0b225951e53115450e0d9b9d	CNA record
erlang rebar3 erlang:rebar3	from 3.9.1 before 3.27.0	NVD
hex hex hex:hex	from 2.3.0 before 2.3.2	NVD
hex hex_core hex:hex_core	from 0.1.0 before 0.12.1	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.