Low
Heap-based Buffer Overflow in GNU coreutils
Type: advisorySources: OSV
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
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-56392
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:33 UTC · Revision 1
Source evidence
Heap-based Buffer Overflow in GNU coreutils
core-osv · Original sourcePublished 24 Jul 2026, 07:44 UTC
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
osv:CVE-2026-56392
Complete source record
{
"id": "2088683473680036069bd4baa2efa9a1275ae0a2beba23dc167a92e47baa7f8e",
"url": "https://osv.dev/vulnerability/CVE-2026-56392",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Heap-based Buffer Overflow in GNU coreutils",
"summary": "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",
"evidence": "osv:CVE-2026-56392",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-56392",
"aliases": [
"CVE-2026-56392"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
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{
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56392.json"
}
}
],
"modified": "2026-10-26T02:30:29.356130117Z",
"provider": "osv",
"references": [
"https://git.savannah.gnu.org/cgit/coreutils.git/",
"https://cert.pl/en/posts/2026/07/CVE-2026-56391",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56392.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-56392",
"https://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d"
],
"provider_metadata": {
"cwe_ids": [
"CWE-122"
],
"cna_assigner": "CERT-PL",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56392.json"
}
},
"related_cves": [
{
"value": "CVE-2026-56392",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 446646,
"published_at": "2026-07-24T07:44:54.885+00:00"
}