PatchTheCVEbison vulnerabilities and fixes
Recent CVEs affecting bison, with upgrade or downgrade steps. 2 tracked.
bison has 2 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 0. Most recent: 2026-07-29. Highest priority: CVE-2026-56389 (score 33/100).
- CVE-2026-56389 HIGH 8.6 DOWNGRADE GNU Bison allows for an execution of an arbitrary program during HTML report generation due to improper handli
- CVE-2026-56390 MEDIUM 6.3 DOWNGRADE GNU Bison improperly handles grammar‑defined output paths
FAQ
How do I fix bison vulnerabilities?
Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.
Is bison being exploited right now?
None of the tracked bison CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which bison CVE should I patch first?
CVE-2026-56389 currently ranks highest (33/100): GNU Bison allows for an execution of an arbitrary program during HTML report generation due to improper handli.