CVE-2026-6238: Buffer overread in ns_printrrf with corrupted RDATA field

mediumCVSS 6.5CVE-2026-6238

CSIRTS triage

vendor: BIND product: BIND Memory corruption

What: A buffer overread occurs in ns_printrrf when processing a corrupted RDATA field.
Who is affected: BIND deployments processing malformed DNS records are affected.
Urgency: Medium priority; not currently exploited but memory corruption could enable denial of service or information disclosure.
Action: Monitor for BIND security updates and apply patches when available.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 6.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6238

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-62380.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-6238	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] GNU libc: Multiple vulnerabilitiescert-bund
unknownUSN-8611-1: GNU C Library vulnerabilitiesubuntu

Recent advisories for Buffer overread in

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-72241: In the Linux kernel, the following vulnerability has been resolved: leds: uleds: Fix potential…nvd · 2026-08-15
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criticalCVE-2026-6094: Heap buffer overread in wc_PKCS7_DecodeEnvelopedData parsing crafted PKCS7 EnvelopedDatamsrc · 2026-06-09