GNU
GNU Bison: vulnerabilities and CVEs
GNU Bison has 4 published vulnerabilities, 2 of them in the last 12 months. 0 are rated critical and 0 are listed by CISA as actively exploited.
CVEs4
Last 12 months2
Critical0
Actively exploited0
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Latest vulnerabilities
| CVE | Severity | EPSS | Active exploitation | Published | Description |
|---|---|---|---|---|---|
| CVE-2026-56390 | Medium (4.6) | 0.18% | — | Jul 29, 2026 | 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.… |
| CVE-2026-56389 | Medium (6.8) | 0.22% | — | Jul 29, 2026 | 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… |
| CVE-2020-24240 | Medium (5.5) | 1.3% | — | Aug 25, 2020 | 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… |
| CVE-2020-14150 | Medium (5.5) | 0.39% | — | Jun 15, 2020 | GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a… |