CVE-2026-56391

Name
CVE-2026-56391
Description
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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
cvd@cert.pl https://cert.pl/en/posts/2026/07/CVE-2026-56391
cvd@cert.pl https://git.savannah.gnu.org/cgit/coreutils.git/
cvd@cert.pl https://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=d64e35a8a4c0e4608321433e0d84d917e4e36371

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:gnu:coreutils:*:*:*:*:*:*:*:* coreutils >= 9.5 <= 9.11

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
coreutils edge-main 9.11-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.11-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.10-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.10-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.9-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.8-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.8-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.7-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.7-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.6-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.6-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.6-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.5-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils edge-main 9.5-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils 3.24-main 9.11-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils 3.23-main 9.8-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils 3.22-main 9.7-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils 3.21-main 9.5-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils 3.21-main 9.5-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils 3.20-main 9.5-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
coreutils 3.20-main 9.5-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable