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Fencer Vulns
medium 5.5

CVE-2020-14150 json

GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash).

published 2020-06-15 6 y ago modified 2026-07-18 3 mo ago also EUVD-2020-6307 , JLSEC-2026-117

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

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.

Patch / fix

  • julia Bison_jll 3.8.2+0
  • gnu bison 3.5.4
  • bison Debian 14, Debian 13, Debian 12 2:3.6.1+dfsg-1

debian advisories DEBIAN-CVE-2020-14150

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-14150 updated cvss 5.5

bison: allows attackers to cause a denial of service

  • Red Hat Enterprise Linux 5 bison Red Hat Enterprise Linux 6 bison, bison-runtime Red Hat Enterprise Linux 7 bison, bison-runtime Red Hat Enterprise Linux 8 bison, bison-runtime
    affected: workaround, no fix planned “To mitigate this flaw, do not use Bison on untrusted input.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia Bison_jll
<3.8.2+0
3.8.2+0

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.