CVE-2026-56392: Heap-based Buffer Overflow in GNU coreutils

unknownCVE-2026-56392

CSIRTS triage

vendor: GNU product: coreutils Memory corruption

What: A heap-based buffer overflow vulnerability exists in GNU coreutils.
Who is affected: Users of GNU coreutils.
Urgency: Remediation is critical due to the potential for exploitation, though no active exploits are reported.
Action: Update to the latest version of GNU coreutils that addresses this vulnerability.

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: unknown
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56392

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-2026-563920.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-56392	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownCVE-2026-56392: GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflo…nvd

Recent advisories for Heap-based Buffer Overflow

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.

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criticalCVE-2026-55971: Heap-based Buffer Overflow vulnerability in Apache Thrift C++ bindings. This issue affects Apa…nvd · 2026-07-27
highCVE-2026-66374: Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in th…nvd · 2026-07-25