CVE-2026-32148: hex — Exploit & Fix

Description

Insufficient Verification of Data Authenticity vulnerability in hexpm hex (Hex.RemoteConverger module) allows dependency integrity bypass via unverified lockfile checksums. Hex stores checksums for dependencies in the mix.lock file to ensure reproducible and integrity-checked builds. However, Hex.RemoteConverger.verify_resolved/2 never executes checksum verification because the lock data returned by Hex.Utils.lock/1 uses string-based dependency names, while the verification logic compares against atom-based names. This type mismatch causes the verification code path to be silently skipped. Checksums are still validated when packages are initially downloaded from the registry, but mismatches between the lockfile and resolved dependencies are not detected. An attacker who can influence cached packages (e.g., via local cache poisoning or a compromised registry) can provide modified dependency contents that will be accepted without detection. The mix.lock file is silently rewritten with the checksum values from the registry, erasing evidence of tampering. This issue affects hex: from 0.16.0 before 2.4.2.

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CVSS v3.1 Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploit Prediction

0.0002

Probability of exploitation

0.06%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-354 CWE-354

CWE-494 CWE-494

Affected Products

Vendor	Product	Versions
hex	hex	0.16.0 — 2.4.2

References

Advisories & Patches

https://github.com/hexpm/hex/commit/d7528c8199a1144511508bf3a6460026a5a14c8e https://github.com/hexpm/hex/security/advisories/GHSA-hmv9-4mfr-m92v https://github.com/hexpm/hex/security/advisories/GHSA-hmv9-4mfr-m92v

Exploits

https://github.com/hexpm/hex/security/advisories/GHSA-hmv9-4mfr-m92v https://osv.dev/vulnerability/EEF-CVE-2026-32148 https://github.com/hexpm/hex/security/advisories/GHSA-hmv9-4mfr-m92v

Other References

https://cna.erlef.org/cves/CVE-2026-32148.html

Frequently Asked Questions

What is CVE-2026-32148? +

Insufficient Verification of Data Authenticity vulnerability in hexpm hex (Hex.RemoteConverger module) allows dependency integrity bypass via unverified lockfile checksums. Hex stores checksums for dependencies in the mix.lock file to ensure reproducible and integrity-checked builds. However, Hex.RemoteConverger.verify_resolved/2 never executes checksum verification because the lock data returned by Hex.Utils.lock/1 uses string-based dependency names, while the verification logic compares against atom-based names. This type mismatch causes the verification code path to be silently skipped. Checksums are still validated when packages are initially downloaded from the registry, but mismatches between the lockfile and resolved dependencies are not detected. An attacker who can influence cached packages (e.g., via local cache poisoning or a compromised registry) can provide modified dependency contents that will be accepted without detection. The mix.lock file is silently rewritten with the checksum values from the registry, erasing evidence of tampering. This issue affects hex: from 0.16.0 before 2.4.2. It has a CVSS v3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-32148? +

CVE-2026-32148 has a CVSS v3.1 score of 5.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0002, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-32148? +

CVE-2026-32148 affects products from hex, specifically: hex. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-32148? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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