CVE-2020-14150

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-06-15 · updated 2026-06-17

Description

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.

Affected products

GNU Bison: before 3.5.4 — fixed in 3.5.4

How to fix

Upgrade to a fixed version: GNU Bison 3.5.4. Check the vendor advisory for mitigations.

References

https://bugs.gentoo.org/717936
https://lists.gnu.org/archive/html/info-gnu/2020-04/msg00000.html
https://bugs.gentoo.org/717936
https://lists.gnu.org/archive/html/info-gnu/2020-04/msg00000.html

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