What’s Vulnerable › Vulnerabilities

CVE-2026-23940: Denial of Service via Oversized Package Upload

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-13 · updated 2026-09-08
• Weakness: CWE-400

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 hex.pm: before 2026-03-10.

Affected products

• hexpm: before 2026-03-09 — fixed in 2026-03-09

How to fix

Upgrade to a fixed version: hexpm 2026-03-09. Check the vendor advisory for mitigations.

References

• https://cna.erlef.org/cves/CVE-2026-23940.html
• https://github.com/hexpm/hexpm/commit/495f01607d3eae4aed7ad09b2f54f31ec7a7df01
• https://github.com/hexpm/hexpm/commit/82911daf5f8fb2ab44f298e3ba22b90bc1ae3746
• https://github.com/hexpm/hexpm/security/advisories/GHSA-jp8w-gxf6-8hcr
• https://osv.dev/vulnerability/EEF-CVE-2026-23940

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