CVE-2026-5052

Name: CVE-2026-5052
Creator: NVD / NIST
Published: 2026-04-17T04:16:12.567+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2026-5052 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. Vault’s PKI engine’s ACME validation did not reject local targets when issuing http-01 and tls-alpn-01 challenges. This may lead to these requests being sent to local network targets, potentially leading to information disclosure. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

Vault’s PKI engine’s ACME validation did not reject local targets when issuing http-01 and tls-alpn-01 challenges. This may lead to these requests being sent to local network targets, potentially leading to information disclosure. Fixed in Vault Community Edition 2.0.0 and Vault Enterprise 2.0.0, 1.21.5, 1.20.10, and 1.19.16.

Metrics

CVSS 3.1

8.6/10

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

EPSS Probability

0.33%

24.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Hashicorp	Vault	>= 1.14.0, < 1.19.16
Hashicorp	Vault	>= 1.14.0, < 2.0.0
Hashicorp	Vault	>= 1.20.0, < 1.20.10
Hashicorp	Vault	>= 1.21.0, < 1.21.5

References

https://discuss.hashicorp.com/t/hcsec-2026-06-vault-vulnerable-to-server-side-request-forgery-in-acme-challenge-validation-via-attacker-controlled-dns/77343Vendor Advisory

Timeline

Published: Apr 17, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-5052?

How severe is CVE-2026-5052?

CVE-2026-5052 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2026-5052?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-5052?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST