CVE-2026-56391

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-56391
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56391.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-56391
Downstream
Published
2026-07-24T07:44:45Z
Modified
2026-09-03T11:47:35Z
Severity
  • 4.6 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
Out‑of‑bounds Read in GNU coreutils
Details

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.

Database specific 
{
    "cna_assigner": "CERT-PL",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56391.json"
}
References

Affected packages

Git / cgit.git.savannah.gnu.org/cgit/coreutils.git

Affected ranges

Type
GIT
Repo
https://cgit.git.savannah.gnu.org/cgit/coreutils.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d64e35a8a4c0e4608321433e0d84d917e4e36371
Database specific
Show details 
{
    "source": "REFERENCES"
}
Type
GIT
Repo
https://github.com/coreutils/coreutils
Events
Introduced
cc8689a07c8cfece66707936e3b914174912bd36
Last Affected
c01fd163a47468a8296fb369f5233853bb551bb6
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:gnu:coreutils:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "9.5"
        },
        {
            "last_affected": "9.11"
        }
    ],
    "source": "CPE_RANGE"
}
Type
GIT
Repo
https://https.git.savannah.gnu.org/git/coreutils.git/
Events
Introduced
cc8689a07c8cfece66707936e3b914174912bd36
Last Affected
c01fd163a47468a8296fb369f5233853bb551bb6
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "9.5"
        },
        {
            "last_affected": "9.11"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

v9.*
v9.10
v9.11
v9.5
v9.6
v9.7
v9.8
v9.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56391.json"