CVE-2026-56390

Katalog CVE

CVSS 6.3 · Medium EPSS 0,18%

Kerentanan External Control of File Name or Path pada gnu bison. Skor CVSS 3.1 6.3 (Medium) menurut NVD.

Deskripsi (NVD)

GNU Bison improperly handles grammar‑defined output paths. Grammar directives such as %output and %header allow specifying file paths, which are accepted without restriction and override caller‑supplied output options. When processing attacker-supplied grammar, this behavior allows directing generated files to arbitrary writable locations on the filesystem, potentially overwriting existing files accessible to the Bison process. Maintainers of this project were notified about this vulnerability, and fixed the issue in commit 8d101c19d4d9aaedf83a448c925513742d4efcf0. However, they did not provide vulnerable version range. Version 3.8.2 was tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.

Rincian

Terbit di NVD

29 Juli 2026

Terakhir diubah

24 Agustus 2026

Status NVD

Analyzed

CVSS 3.1

6.3 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-73: External Control of File Name or Path

EPSS (30 hari)

0,18% peluang dieksploitasi; lebih tinggi dari 6,6% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://cgit.git.savannah.gnu.org/cgit/bison.git/commit/?id=8d101c19d4d9aaedf83a448c925513742d4efcf0 patch
• https://cert.pl/en/posts/2026/07/CVE-2026-56389 advisory pihak ketiga
• https://cgit.git.savannah.gnu.org/cgit/bison.git/ product