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CVE-2021-33462: An issue was discovered in yasm version 1.3.0. There is a use-after-free in expr_traverse_nodes_post() in libyasm/expr.c.
CVE-2021-33462 · published 4 years ago
Summary
An issue was discovered in yasm version 1.3.0. There is a use-after-free in expr_traverse_nodes_post() in libyasm/expr.c.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| – | tortall | yasm |
1.3.0 cpe:2.3:a:tortall:yasm:1.3.0:*:*:*:*:*:*:* |
| Ubuntu:16.04:LTS | canonical | yasm | All versions |
| Debian:12 | debian | yasm | All versions |
Original advisory text
An issue was discovered in yasm version 1.3.0. There is a use-after-free in expr_traverse_nodes_post() in libyasm/expr.c.
An issue was discovered in yasm version 1.3.0. There is a use-after-free in expr_traverse_nodes_post() in libyasm/expr.c.
References
- https://ubuntu.com/security/CVE-2021-33462 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2021-33462 Third Party Advisory
- https://github.com/yasm/yasm/issues/165 Third Party Advisory
- https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-33462 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker partial control (estimated)
Type
CWE-416Use After Free
Timeline
Published26 Jul 2022
Updated31 Oct 2026
First seen29 Sep 2026
Sources
CVE-2021-33462 · NVD
UBUNTU-CVE-2021-33462 · OSV
CVE-2021-33462 · OSV
DEBIAN-CVE-2021-33462 · OSV
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