CVE-2021-33641

byacc: malloc incorrectly accessing released memory leads to use after free

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Severity

Moderate

Red Hat Product Security

4.4

CVSS 3.1

Review impact separately from score.

Published · May 28, 2022

Updated · November 21, 2025

Description

A use-after-free flaw was found in the byacc package. When processing a specially crafted file, malloc incorrectly accesses the released memory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.4
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

CWE-416 · Use After Free