How severe is CVE-2026-21619?

CVE-2026-21619 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-21619 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21619?

CVE-2026-21619 primarily affects Erlang Rebar3. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-21619?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-21619 have an EU (EUVD) identifier?

Yes. CVE-2026-21619 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9037.

When was CVE-2026-21619 published?

CVE-2026-21619 was published on 2026-02-27 and last updated on 2026-06-17.

CVE-2026-21619

CVE-2026-21619 is a high-severity vulnerability in Erlang Rebar3 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 2.0
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9037
Weakness: CWE-400
Affected product: Erlang Rebar3
Published: 2026-02-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-21619?: 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.
How severe is CVE-2026-21619?: CVE-2026-21619 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-21619 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21619?: CVE-2026-21619 primarily affects Erlang Rebar3. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-21619?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-21619 have an EU (EUVD) identifier?: Yes. CVE-2026-21619 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9037.
When was CVE-2026-21619 published?: CVE-2026-21619 was published on 2026-02-27 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:*
cpe:2.3:a:hex:hex:*:*:*:*:*:*:*:*
cpe:2.3:a:hex:hex_core:*:*:*:*:*:*:*:*

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