Is CVE-2026-5052 in the CISA KEV catalog?

No. CVE-2026-5052 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-5052?

CVE-2026-5052 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2026-5052?

CVE-2026-5052 has an EPSS score of 0.33% (25th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5052?

Upgrade Hashicorp Vault to 1.19.16 or later.

CVE & CISA-KEV Catalog

CVE-2026-5052

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-918Server-Side Request Forgery (SSRF)

How to fix

Remediation Available

Hashicorp VaultWindows application

Affected:1.14.0 1.19.16Fixed in:1.19.16HashiCorp, Inc.

Affected:1.14.0 2.0.0Fixed in:2.0.0HashiCorp, Inc.

Affected:1.20.0 1.20.10Fixed in:1.20.10HashiCorp, Inc.

Affected:1.21.0 1.21.5Fixed in:1.21.5HashiCorp, Inc.

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.33%probability of exploitation in 30 days

25thpercentile

Low risk: more likely to be exploited than 25% of all known CVEs.

References

Vendor Advisory1

discuss.hashicorp.com

Related Vulnerabilities

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-21893	High	8.2	100%	KEV + Ransom	-
CVE-2021-40438	Critical	9.0	100%	KEV	Fix
CVE-2021-34473	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-26855	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-41040	High	8.8	100%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-27.