CVE-2026-21619
7.5 · HIGHOverview
CVE-2026-21619 is a high-severity vulnerability affecting erlang rebar3. It was published on February 27, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from erlang. Update rebar3 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| erlang | rebar3 | >= 3.9.1, < 3.27.0 | Affected |
| hex | hex | >= 2.3.0, < 2.3.2 | Affected |
| hex | hex_core | >= 0.1.0, < 0.12.1 | Affected |
References
Frequently Asked Questions
What is CVE-2026-21619?
CVE-2026-21619 is a high-severity vulnerability affecting erlang rebar3. It was published on February 27, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-21619?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-21619?
Check the references section for vendor advisories and patches from erlang. Update rebar3 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-21619?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-21619 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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