תיאור (מקור, אנגלית)
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.
מוצרים מושפעים
gnu: bison
קישורים3
- cgit.git.savannah.gnu.org/cgit/bison.git/commit/?id=8d101c19d4… Patch
- cert.pl/en/posts/2026/07/CVE-2026-56389 Third Party Advisory
- cgit.git.savannah.gnu.org/cgit/bison.git/ Product
מדדים
- CVSS 3.1
-
6.3
MEDIUM
מקור הציון: NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N - CVSS 4.0
-
4.6
MEDIUM
מקור הציון: CNA
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — סבירות ניצול
- 0% אחוזון 2 · נכון ל-13 בנובמבר 2026
- CWE
- CWE-73
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