CVE-2020-24240: gnu bison

csirt@kutim:~/threat-intel/cve/CVE-2020-24240

CVSS 5.5 · Medium EPSS 1,3%

Kerentanan Use After Free pada gnu bison. Skor CVSS 3.1 5.5 (Medium) menurut NVD.

Deskripsi (NVD)

GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a '\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.

Rincian

Terbit di NVD: 25 Agustus 2020
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 5.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-416: Use After Free
EPSS (30 hari): 1,3% peluang dieksploitasi; lebih tinggi dari 68,9% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
gnu	bison	Versi 3.7

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html mailing list · advisory vendor
https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d patch · advisory pihak ketiga
https://github.com/akimd/bison/compare/v3.7...v3.7.1 advisory pihak ketiga

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.