How severe is CVE-2026-23940?

CVE-2026-23940 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-23940 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23940?

CVE-2026-23940 affects Hex Hexpm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23940?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-23940 have an EU (EUVD) identifier?

Yes. CVE-2026-23940 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12050.

When was CVE-2026-23940 published?

CVE-2026-23940 was published on 2026-03-13 and last updated on 2026-06-17.

CVE-2026-23940

CVE-2026-23940 is a medium-severity vulnerability in Hex Hexpm with a CVSS 3.x base score of 6.5. 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: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12050
Weakness: CWE-400
Affected product: Hex Hexpm
Published: 2026-03-13
Last modified: 2026-06-17

Description

Uncontrolled Resource Consumption vulnerability in hexpm hexpm/hexpm allows Excessive Allocation. Publishing an oversized package can cause Hex.pm to run out of memory while extracting the uploaded package tarball. This can terminate the affected application instance and result in a denial of service for package publishing and potentially other package-processing functionality. This issue affects hexpm: before 495f01607d3eae4aed7ad09b2f54f31ec7a7df01; hex.pm: before 2026-03-10.

Frequently asked questions

What is CVE-2026-23940?: Uncontrolled Resource Consumption vulnerability in hexpm hexpm/hexpm allows Excessive Allocation. Publishing an oversized package can cause Hex.pm to run out of memory while extracting the uploaded package tarball. This can terminate the affected application instance and result in a denial of service for package publishing and potentially other package-processing functionality. This issue affects hexpm: before 495f01607d3eae4aed7ad09b2f54f31ec7a7df01; hex.pm: before 2026-03-10.
How severe is CVE-2026-23940?: CVE-2026-23940 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-23940 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23940?: CVE-2026-23940 affects Hex Hexpm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23940?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23940 have an EU (EUVD) identifier?: Yes. CVE-2026-23940 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12050.
When was CVE-2026-23940 published?: CVE-2026-23940 was published on 2026-03-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hex:hexpm:*:*:*:*:*:*:*:*

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