Denial of Service via Oversized Package Upload

Answer in brief

CVE-2026-23940 records a Unknown severity vulnerability in Denial of Service via Oversized Package Upload. The current sources do not mark it as known exploited. The current feed maps hexpm/hexpm (generic), hexpm/hexpm (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 13, 2026Updated Sep 8, 2026Source checked Sep 8, 2026First seen by HOL Sep 8, 2026Material review Sep 8, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps hexpm/hexpm (generic), hexpm/hexpm (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
hexpm/hexpmgeneric	>=0 <2026-03-10	2026-03-10
hexpm/hexpmgeneric	>=82911daf5f8fb2ab44f298e3ba22b90bc1ae3746 <495f01607d3eae4aed7ad09b2f54f31ec7a7df01	495f01607d3eae4aed7ad09b2f54f31ec7a7df01

Recommended response

Check inventory. Check lockfiles and deployed manifests for hexpm/hexpm, hexpm/hexpm.
Review the reported fix. Update hexpm/hexpm to 2026-03-10; hexpm/hexpm to 495f01607d3eae4aed7ad09b2f54f31ec7a7df01 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Mar 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 8, 2026

Sources and claim methodology

Upstream source 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. This issue affects hex.pm: before 2026-03-10.

Quoted source text, attributed separately from HOL analysis.