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12 vulnerabilities found for bison by gnu
CVE-2026-56390 (GCVE-0-2026-56390)
Vulnerability from nvd – Published: 2026-07-29 09:40 – Updated: 2026-07-29 12:15 X_Open Source
VLAI
EPSS
VEX
Title
Arbitrary Output Location Change in GNU Bison
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 12:14 UTC
CWE
- CWE-73 - External Control of File Name or Path
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-56389 | third-party-advisory |
| https://cgit.git.savannah.gnu.org/cgit/bison.git/ | patch |
| https://cgit.git.savannah.gnu.org/cgit/bison.git/… | patch |
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CVE-2026-56389 (GCVE-0-2026-56389)
Vulnerability from nvd – Published: 2026-07-29 09:39 – Updated: 2026-07-29 12:21 X_Open Source
VLAI
EPSS
VEX
Title
Arbitrary Command Execution in GNU Bison
Summary
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 accepted without restriction and passed directly to execvp().
When running bison --html on a attacker-provided grammar, this behavior allows execution of an arbitrary program with the privileges of the Bison process.
Maintainers of this project were notified about this vulnerability, and fixed the issue in commit 3169c1e7a2c6acc4c59dfcf8b089896d6881925b. 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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 12:20 UTC
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-56389 | third-party-advisory |
| https://cgit.git.savannah.gnu.org/cgit/bison.git/ | product |
| https://cgit.git.savannah.gnu.org/cgit/bison.git/… | patch |
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CVE-2025-8734 (GCVE-0-2025-8734)
Vulnerability from nvd – Published: 2025-08-08 18:02 – Updated: 2025-11-03 23:19
VLAI
EPSS
VEX
** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: Additional analysis indicates that the files referenced in the stack trace do not exist in Bison.
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CVE-2025-8733 (GCVE-0-2025-8733)
Vulnerability from nvd – Published: 2025-08-08 17:32 – Updated: 2025-11-03 23:19
VLAI
EPSS
VEX
** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: Additional analysis indicates that the files referenced in the stack trace do not exist in Bison.
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CVE-2020-24240 (GCVE-0-2020-24240)
Vulnerability from nvd – Published: 2020-08-25 13:45 – Updated: 2024-08-04 15:12
VLAI
EPSS
VEX
Summary
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.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/akimd/bison/commit/be95a4fe295… | x_refsource_MISC |
| https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html | x_refsource_MISC |
| https://github.com/akimd/bison/compare/v3.7...v3.7.1 | x_refsource_MISC |
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CVE-2020-14150 (GCVE-0-2020-14150)
Vulnerability from nvd – Published: 2020-06-15 16:52 – Updated: 2024-08-04 12:39
VLAI
EPSS
VEX
Summary
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 show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.gnu.org/archive/html/info-gnu/2020-… | x_refsource_MISC |
| https://bugs.gentoo.org/717936 | x_refsource_MISC |
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CVE-2026-56390 (GCVE-0-2026-56390)
Vulnerability from cvelistv5 – Published: 2026-07-29 09:40 – Updated: 2026-07-29 12:15 X_Open Source
VLAI
EPSS
VEX
Title
Arbitrary Output Location Change in GNU Bison
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 12:14 UTC
CWE
- CWE-73 - External Control of File Name or Path
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-56389 | third-party-advisory |
| https://cgit.git.savannah.gnu.org/cgit/bison.git/ | patch |
| https://cgit.git.savannah.gnu.org/cgit/bison.git/… | patch |
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CVE-2026-56389 (GCVE-0-2026-56389)
Vulnerability from cvelistv5 – Published: 2026-07-29 09:39 – Updated: 2026-07-29 12:21 X_Open Source
VLAI
EPSS
VEX
Title
Arbitrary Command Execution in GNU Bison
Summary
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 accepted without restriction and passed directly to execvp().
When running bison --html on a attacker-provided grammar, this behavior allows execution of an arbitrary program with the privileges of the Bison process.
Maintainers of this project were notified about this vulnerability, and fixed the issue in commit 3169c1e7a2c6acc4c59dfcf8b089896d6881925b. 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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 12:20 UTC
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/07/CVE-2026-56389 | third-party-advisory |
| https://cgit.git.savannah.gnu.org/cgit/bison.git/ | product |
| https://cgit.git.savannah.gnu.org/cgit/bison.git/… | patch |
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CVE-2025-8734 (GCVE-0-2025-8734)
Vulnerability from cvelistv5 – Published: 2025-08-08 18:02 – Updated: 2025-11-03 23:19
VLAI
EPSS
VEX
** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: Additional analysis indicates that the files referenced in the stack trace do not exist in Bison.
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CVE-2025-8733 (GCVE-0-2025-8733)
Vulnerability from cvelistv5 – Published: 2025-08-08 17:32 – Updated: 2025-11-03 23:19
VLAI
EPSS
VEX
** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: Additional analysis indicates that the files referenced in the stack trace do not exist in Bison.
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CVE-2020-24240 (GCVE-0-2020-24240)
Vulnerability from cvelistv5 – Published: 2020-08-25 13:45 – Updated: 2024-08-04 15:12
VLAI
EPSS
VEX
Summary
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.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/akimd/bison/commit/be95a4fe295… | x_refsource_MISC |
| https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html | x_refsource_MISC |
| https://github.com/akimd/bison/compare/v3.7...v3.7.1 | x_refsource_MISC |
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CVE-2020-14150 (GCVE-0-2020-14150)
Vulnerability from cvelistv5 – Published: 2020-06-15 16:52 – Updated: 2024-08-04 12:39
VLAI
EPSS
VEX
Summary
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 show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.gnu.org/archive/html/info-gnu/2020-… | x_refsource_MISC |
| https://bugs.gentoo.org/717936 | x_refsource_MISC |
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