Is CVE-2026-21619 actively exploited?

CVE-2026-21619 has no public evidence of in-the-wild exploitation as of 2026-03-23.

What is the CVSS score for CVE-2026-21619?

CVE-2026-21619 has a CVSS score of 2 (LOW severity). Vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-21619?

Patch guidance is available from erlang security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-21619.

Which products are affected by CVE-2026-21619?

3 products: erlang rebar3, hex hex, hex hex core.

CVE-2026-21619 - remediation guidance & executive summary

Description

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 Metrics

Vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: low
User Action: active
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-400 CWE-502 · Insecure Deserialization

Metadata

Primary Vendor: ERLANG
Published: 2/27/2026
Last Modified: 3/23/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-21619

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary