Is CVE-2026-27145 in the CISA KEV catalog?

No. CVE-2026-27145 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-27145?

CVE-2026-27145 has a CVSS v3 base score of 6.5 (Moderate).

What is the EPSS score for CVE-2026-27145?

CVE-2026-27145 has an EPSS score of 0.65% (47th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2026-27145

Q: How do I fix CVE-2026-27145?

Upgrade registry.redhat.io/rhdh/rhdh on rhel 8 to hub-rhel9@sha256:044d2d72c21329826c144d9b55c381576a421188139de0fed693e74997665d2c_amd64 or later. Fixes are available for 2 affected products.

MEDIUM

6.5

CVSS v3

NVD

Description

(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.

CWE-606

How to fix

Remediation Available

registry.redhat.io/rhdh/rhdhRed Hat / RHEL

Fixed in:hub-rhel9@sha256:044d2d72c21329826c144d9b55c381576a421188139de0fed693e74997665d2c_amd64RHSA-2026:33574

Fixed in:rhel9-operator@sha256:219babfcc89ae903edf35022aae79ba1d1b326386978db8ff267e24e50f9a785_amd64RHSA-2026:33574

Fixed in:operator-bundle@sha256:66fb23e8dbced7bb187928fb38562ae9e2649265d56f745044dd5e79b4209893_amd64RHSA-2026:33574

registry.redhat.io/rhdh/rhdhRocky

Fixed in:hub-rhel9@sha256:044d2d72c21329826c144d9b55c381576a421188139de0fed693e74997665d2c_amd64RHSA-2026:33574

Fixed in:rhel9-operator@sha256:219babfcc89ae903edf35022aae79ba1d1b326386978db8ff267e24e50f9a785_amd64RHSA-2026:33574

Fixed in:operator-bundle@sha256:66fb23e8dbced7bb187928fb38562ae9e2649265d56f745044dd5e79b4209893_amd64RHSA-2026:33574

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityHigh

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

Exploit Intelligence

0.65%probability of exploitation in 30 days

47thpercentile

Moderate risk: more likely to be exploited than 47% of all known CVEs.

References

Other references8

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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 2026-07-01.