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CVE-2026-56391: Out‑of‑bounds Read in GNU coreutils

unknownCVE-2026-56391

CSIRTS triage

vendor: GNUproduct: coreutilsInformation disclosure
What
An out-of-bounds read vulnerability in GNU coreutils allows reading memory beyond allocated buffers.
Who is affected
All deployments of GNU coreutils are potentially affected.
Urgency
Severity unknown and no CVSS available; requires clarification on affected versions and exploitability.
Action
Wait for clarification from GNU coreutils maintainers or advisory update with affected versions before patching.

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
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56391

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-56391coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Out‑of‑bounds Read 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.

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