CVE-2026-33467: elastic package Signature Bypass — Fix

Description

Improper Verification of Cryptographic Signature (CWE-347) in Elastic Package Registry could allow an attacker positioned to intercept network traffic, or to otherwise influence the contents served to a self-hosted registry, to substitute a tampered package without the integrity check failing closed.

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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

0.04%

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-347 CWE-347

Affected Products

Vendor	Product	Versions
elastic	elastic_package_registry	< 1.38.0

References

Advisories & Patches

https://discuss.elastic.co/t/elastic-package-registry-1-38-0-security-update-esa-2026-27/386081

Frequently Asked Questions

What is CVE-2026-33467? +

Improper Verification of Cryptographic Signature (CWE-347) in Elastic Package Registry could allow an attacker positioned to intercept network traffic, or to otherwise influence the contents served to a self-hosted registry, to substitute a tampered package without the integrity check failing closed. It has a CVSS v3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-33467? +

CVE-2026-33467 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-2026-33467? +

CVE-2026-33467 affects products from elastic, specifically: elastic_package_registry. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-33467? +

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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