Highest advisory severityMedium 2 vendors · 2 advisories

CVE-2026-56392

GNU coreutils unexpand: Denial of Service via crafted tab stop values

CVE-2026-56392: GNU coreutils unexpand: Denial of Service via crafted tab stop values. Not in the CISA KEV catalog.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-56392 key facts

CISA KEV: Not listed (catalog checked Nov 6, 2026)
Highest advisory severity: Medium
CVSS base score: 4.4 (Red Hat), 1.8 (NetApp)
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L (Red Hat)
Weakness: CWE-787
Fixed releases: Red Hat: coreutils-0:9.5-8.el10_2.1, coreutils-0:8.30-20.el8_10, coreutils-0:8.32-41.el9_8.1, cert-manager/jetstack-cert-manager-rhel9:1790223279, cert-manager/cert-manager-istio-csr-rhel9:1790223719, cert-manager/cert-manager-operator-rhel9:1790272426 and 26 more in the advisory
Vendor advisories: 2 from NetApp, Red Hat
VulniPulse record: Published Jul 25, 2026 · Updated Oct 23, 2026

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-56392; bulletin-wide values are not repeated here.

Is CVE-2026-56392 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-56392 is not in the CISA KEV catalog (checked Nov 6, 2026) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-56392?

Upgrade to a fixed release named by the vendor:

Red Hat: coreutils-0:9.5-8.el10_2.1, coreutils-0:8.30-20.el8_10, coreutils-0:8.32-41.el9_8.1, cert-manager/jetstack-cert-manager-rhel9:1790223279, cert-manager/cert-manager-istio-csr-rhel9:1790223719, cert-manager/cert-manager-operator-rhel9:1790272426

NetApp HCI Baseboard Management Controller (BMC) - H610S has no planned fix; migrate to a supported release or product and consult NetApp's end-of-support notice. (NetApp)
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory

Advisory severityLow1.8
Low [CVE-2026-56392] GNU Coreutils Vulnerability in NetApp Products
NTAP-20261023-0013Source published Oct 23, 2026Source updated Oct 23, 2026
GNU coreutils versions through 9.11 are susceptible to a vulnerability which when successfully exploited could lead to an out‑of‑bounds heap write. Successful exploitation of this vulnerability could lead to addition or modification of data or Denial of Service (DoS). Affected products: NetApp HCI Baseboard Management Controller (BMC) - H610S. NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.
Affected products in this advisory
NetApp HCI Baseboard Management Controller (BMC) - H610S
Source-reported affected versions
9.11
Source-reported fixed versions
No fixed-version detail extracted. This does not mean no fix exists.
Mitigation guidance
NetApp HCI Baseboard Management Controller (BMC) - H610S has no planned fix; migrate to a supported release or product and consult NetApp's end-of-support notice.
Full advisory and evidence Open source bulletin

Red Hat

1 advisory

Advisory severityMedium4.4
Medium [CVE-2026-56392] GNU coreutils unexpand: Denial of Service via crafted tab stop values
CVE-2026-56392Source published Jul 24, 2026Source updated Jul 24, 2026
GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted input, subsequent writes exceed the allocated memory, leading to an out‑of‑bounds heap write. When running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout. This issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d A flaw was found in GNU coreutils, specifically in the `unexpand` utility. This can lead to an undersized memory buffer, allowing…
Affected products in this advisory
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Cert Manager support for Red Hat OpenShift release 1.20
8 more entries in the full advisory.
Source-reported affected versions
Affected-version details not available in this record.
Source-reported fixed versions
coreutils-0:9.5-8.el10_2.1
coreutils-0:8.30-20.el8_10
coreutils-0:8.32-41.el9_8.1
cert-manager/jetstack-cert-manager-rhel9:1790223279
28 more entries in the full advisory.
Mitigation guidance
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Full advisory and evidence Open source bulletin

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