DEBIAN-CVE-2026-56391
GNU coreutils uniq is vulnerable to an out‑of‑bounds read due to incorrect handling of multibyte input when the -w (--check-chars) option is used. The find_field() function miscalculates the byte length of characters by repeatedly processing a fixed pointer instead of advancing through the input, resulting in an inflated length value. This incorrect length is later used in a memcmp operation, causing reads beyond the allocated buffer when processing crafted multibyte input. When running GNU coreutils uniq with attacker-provided arguments, this behavior leads to a crash and potential adjacent heap memory exposure. This issue has been fixed in the commit d64e35a8a4c0e4608321433e0d84d917e4e36371.
DEBIAN-CVE-2026-56391
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-2026-56391
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-2026-56391.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-2026-56391.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-2026-56391.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57966 · Revision 1
- Added to Heist Feed
- Publisher date