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CVE-2020-24240

Published: 25 August 2020

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.

Priority

Low

CVSS 3 base score: 5.5

Status

Package Release Status
bison
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

groovy Ignored
(reached end-of-life)
hirsute Ignored
(reached end-of-life)
impish Needed

jammy Needed

precise Does not exist

trusty Does not exist

upstream
Released (3.7.1)
xenial Needed