CVE-2026-56389

Katalog CVE

CVSS 8.6 · High EPSS 0,22%

Kerentanan Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') pada gnu bison. Skor CVSS 3.1 8.6 (High) menurut NVD.

Deskripsi (NVD)

GNU Bison allows for an execution of an arbitrary program during HTML report generation due to improper handling of grammar-defined configuration variables. A grammar file can override the executable used for the XML‑to‑HTML transformation step via %define tool.xsltproc, which is accepted without restriction and passed directly to execvp(). When running bison --html on a attacker-provided grammar, this behavior allows execution of an arbitrary program with the privileges of the Bison process. Maintainers of this project were notified about this vulnerability, and fixed the issue in commit 3169c1e7a2c6acc4c59dfcf8b089896d6881925b. 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

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

Jenis kelemahan (CWE)

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

EPSS (30 hari)

0,22% peluang dieksploitasi; lebih tinggi dari 12,0% 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=3169c1e7a2c6acc4c59dfcf8b089896d6881925b patch
• https://cert.pl/en/posts/2026/07/CVE-2026-56389 advisory pihak ketiga
• https://cgit.git.savannah.gnu.org/cgit/bison.git/ product