TI-2026-17411 Aliases CVE-2026-21619 GHSA-hx9w-f2w9-9g96

Unsafe Deserialization of Erlang Terms in hex_core

LOW 12CWE-400Published 2026-02-27 · Updated 2026-05-27

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Active
Attack complexity: Low
Attack requirements: Present
Impact type: Denial of service, Code execution
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400 and CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00638 50th percentileScored 2026-11-07

Fix Fixed hex_core (hexpm): 0.12.1hex (hexpm): 2.3.2+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
hexpm	hex_core	0.1.0 to before 0.12.1	0.12.1	Patch available	CNA
hexpm	hex	2.3.0 to before 2.3.2	2.3.2	Patch available	CNA
Erlang	rebar3	3.9.1 to before 3.27.0	3.27.0	Patch available	CNA
—	hex_core (Hex)	before 0.12.1	0.12.1	Patch available	GHSA-hx9w-f2w9-9g96

hex_core Vendorhexpm Affected 0.1.0 to before 0.12.1 Fixed in 0.12.1 Patch available CNA
hex Vendorhexpm Affected 2.3.0 to before 2.3.2 Fixed in 2.3.2 Patch available CNA
rebar3 VendorErlang Affected 3.9.1 to before 3.27.0 Fixed in 3.27.0 Patch available CNA
hex_core (Hex) Vendor— Affected before 0.12.1 Fixed in 0.12.1 Patch available GHSA-hx9w-f2w9-9g96

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:a:erlang:rebar3::::::::	3.9.1 to before 3.27.0	Vulnerable	Erlang
cpe:2.3:a:hex:hex::::::::	2.3.0 to before 2.3.2	Vulnerable	hexpm
cpe:2.3:a:hex:hex_core::::::::	0.1.0 to before 0.12.1	Vulnerable	hexpm

cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:* Versions 3.9.1 to before 3.27.0 Vulnerable ·Erlang
cpe:2.3:a:hex:hex:*:*:*:*:*:*:*:* Versions 2.3.0 to before 2.3.2 Vulnerable ·hexpm
cpe:2.3:a:hex:hex_core:*:*:*:*:*:*:*:* Versions 0.1.0 to before 0.12.1 Vulnerable ·hexpm

Remediation

Fix · CNA hex_core (hexpm) Fixed in 0.12.1
Fix · CNA hex (hexpm) Fixed in 2.3.2
Fix · CNA rebar3 (erlang) Fixed in 3.27.0
Fix · GHSA-hx9w-f2w9-9g96 hex_core (Hex) Fixed in 0.12.1 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-21619
2026-10-03 Alias added: GHSA-hx9w-f2w9-9g96
2026-10-25 EPSS moved to the 50th–90th percentile

References

Patch 3

Advisory 2

Other 3

TI-2026-24685 Lockfile checksums not verified in Hex allows dependency integrity bypass CVSS 4.0HIGH 8.9
TI-2019-15829 Hex package manager version 0.14.0 through 0.18.2 contains a Signing oracle vulnerability… CVSS 3.0HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences