GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash).
Priority LOW 25Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
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.
Why it matters now
EPSS 0.00385 32nd percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-14150
- 2026-10-03 Alias added: GHSA-wqmg-pp5q-5hqr
References
More GNU Bison vulnerabilities
- TI-2026-40749 Arbitrary Command Execution in GNU Bison CVSS 4.0MEDIUM 6.8
- TI-2020-14854 GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called… CVSS 3.1MEDIUM 5.5
- TI-2026-40750 Arbitrary Output Location Change in GNU Bison CVSS 4.0MEDIUM 4.6
Sources
- CVE-2020-14150 · CVE Program
- CVE-2020-14150 · NVD
- FIRST EPSS
- GHSA-wqmg-pp5q-5hqr · GitHub Advisory Database · CC BY 4.0
- CVE-2020-14150 · Red Hat security data · CC BY 4.0
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