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GNU Bison vulnerabilities

4 published CVES affecting GNU Bison, from public sources (CVE.org, NVD, CISA KEV, FIRST EPSS, OSV).

Total
4
Critical
0
High
0
Medium
4
Low
0
Unscored
0
CISA KEV
0

Latest GNU Bison CVEs

Newest publication first

  1. CVE-2026-56390 Arbitrary Output Location Change in GNU Bison

    Published
    MediumCVSS 4.6

    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 allo...

  2. CVE-2026-56389 Arbitrary Command Execution in GNU Bison

    Published
    MediumCVSS 6.8

    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...

  3. CVE-2020-24240 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,....

    Published
    MediumCVSS 5.5

    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/a...

  4. CVE-2020-14150 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....

    Published
    MediumCVSS 5.5

    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 specific compiler/architecture. The bug reports were intended to...

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.