CVE-2020-24240 describes a use-after-free vulnerability in GNU Bison versions prior to 3.7.1, specifically within the _obstack_free function when processing a null byte. This flaw primarily affects Bison itself, not code generated by it, and carries a CVSS score of 5.5 (Medium), indicating a local attack vector with low complexity and a high impact on availability. While a crash may occur, exploitation requires untrusted input and specific compiler/architecture conditions. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
3.7CPE matchmatch criteria | cpe:2.3:a:gnu:bison:3.7:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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