CVE-2026-105280: hexpm hex

Hex writes unverified package tarballs to standard output in mix hex.package fetch

CVSS 6.9 MediumEPSS 0.0021 · 11th percentile

Published by the CVE Program (CNA: EEF) at 12 Oct 2026, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
hexpm	hex Package name: hex pkg:otp/hex?repository_url=https:%2F%2Fgithub.com%2Fhexpm%2Fhex&vcs_url=repository_url=git%2Bhttps:%2F%2Fgithub.com%2Fhexpm%2Fhex.git	affected 0.20.2 to before 2.5.2 semver Other versions: unaffected
hexpm	hex Package name: hexpm/hex https://github.com pkg:github/hexpm/hex	affected d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c to before * git Other versions: unaffected

Identifiers

CVE-2026-105280

CNA

EEF

Weakness (CWE)

CWE-354

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.9	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N	CNA (EEF)

CISA KEV Not listed.
EPSS 0.0021, the 11th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 12 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/hexpm/hex/security/advisories/GHSA-98jr-23pm-vj7c relatedvendor-advisory
cna.erlef.org/cves/CVE-2026-105280.html related
osv.dev/vulnerability/EEF-CVE-2026-105280 related
github.com/hexpm/hex/commit/d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c related
github.com/hexpm/hex/commit/8a14632ca6ba8a8afd2a3f2098bc267c13e13d93 patch
github.com/hexpm/hex/commit/69489f8b74213f03db10169e6e5407e6d5fee512 patch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.