DEBIAN-CVE-2026-56392
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
DEBIAN-CVE-2026-56392
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-56392
coreutils
Source reference: /affected/0/package/name
- Affected versions
- 9.1-1
Source reference:
/affected/0/versions9.10-1Source reference:
/affected/0/versions9.4-1Source reference:
/affected/0/versions9.4-2Source reference:
/affected/0/versions9.4-3Source reference:
/affected/0/versions9.4-3.1Source reference:
/affected/0/versions9.5-1Source reference:
/affected/0/versions9.6-1Source reference:
/affected/0/versions9.6-2Source reference:
/affected/0/versions9.7-1Source reference:
/affected/0/versions9.7-2Source reference:
/affected/0/versions9.7-3Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
coreutils
Source reference: /affected/1/package/name
- Affected versions
- 9.10-1
Source reference:
/affected/1/versions9.7-3Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
coreutils
Source reference: /affected/2/package/name
- Affected versions
- 9.10-1
Source reference:
/affected/2/versions9.7-3Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "coreutils",
"purl": "pkg:deb/debian/coreutils?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"9.1-1",
"9.10-1",
"9.4-1",
"9.4-2",
"9.4-3",
"9.4-3.1",
"9.5-1",
"9.6-1",
"9.6-2",
"9.7-1",
"9.7-2",
"9.7-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56392.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "coreutils",
"purl": "pkg:deb/debian/coreutils?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"9.10-1",
"9.7-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56392.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "coreutils",
"purl": "pkg:deb/debian/coreutils?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"9.10-1",
"9.7-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56392.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
]- Related CVEs
- CVE-2026-56392
Source reference:
/upstream
Publisher severity
medium
Source reference: /severity/0/score
- Event
- #72958 · Revision 1
- Added to Heist Feed
- Publisher date