Is CVE-2026-6238 in the CISA KEV catalog?

No. CVE-2026-6238 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-6238?

CVE-2026-6238 has a CVSS v3 base score of 6.5 (Moderate).

What is the EPSS score for CVE-2026-6238?

CVE-2026-6238 has an EPSS score of 0.31% (23th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-6238?

Upgrade glibc on rhel 8 to main@aarch64 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-6238

MEDIUM

6.5

CVSS v3

NVD

Description

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory. These functions are for application debugging only and hence not in the path of code executed by the DNS resolver. Further, they have been deprecated since version 2.34 and should not be used by any new applications. Applications should consider porting away from these interfaces since they may be removed in future versions.

CWE-126Buffer Over-read

How to fix

Remediation Available

glibcRed Hat / RHEL

Fixed in:main@aarch64RHSA-2026:12740

Fixed in:main@x86_64RHSA-2026:12740

Fixed in:main@srcRHSA-2026:12740

Fixed in:main@noarchRHSA-2026:12740

glibcRocky

Fixed in:main@aarch64RHSA-2026:12740

Fixed in:main@x86_64RHSA-2026:12740

Fixed in:main@srcRHSA-2026:12740

Fixed in:main@noarchRHSA-2026:12740

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

AvailabilityLow

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

Exploit Intelligence

0.31%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Third-Party Advisory1

inbox.sourceware.org

Issue Tracking1

sourceware.org

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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 2026-06-19.