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Coreutils CVE-2026-56392

| EUVDEUVD-2026-48525 LOW
Heap-based Buffer Overflow (CWE-122)
2026-07-24 CERT-PL GHSA-g24f-m2hx-pfgx
1.8
CVSS 4.0 · Vendor: CERT-PL

Severity by source

Vendor (CERT-PL) PRIMARY
1.8 LOW
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (CERT-PL) · only source for this CVE.

CVSS VectorVendor: CERT-PL

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 26, 2026 - 12:21 vuln.today

DescriptionCVE.org

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

AnalysisAI

Heap-based buffer overflow in GNU coreutils unexpand allows an attacker who can supply large tab stop (-t) values to cause a denial of service and potentially achieve a heap write primitive. The flaw affects coreutils versions up to 9.11 and was fixed in commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d. No active exploitation is known, and EPSS predicts a 0.15% likelihood of exploitation.

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CVE-2026-56392 vulnerability details – vuln.today

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