What is CVE-2022-40009?

CVE-2022-40009 is a critical-severity vulnerability in Swftools, classified under Use After Free. CVSS score: 9.8/10. Published 2022-09-20.

How severe is CVE-2022-40009?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Swftools

CVE-2022-40009

SWFTools commit 772e55a was discovered to contain a heap-use-after-free via the function grow_unicode at /lib/ttf.c.

Vulnerability class: Use-After-Free

Published 2022-09-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.012 · change: +0.001

Affected products

Swftools — versions 2021-12-16

Weakness classification (CWE)

CWE-416 — Use After Free

References

github.com/matthiaskramm/swftools/issues/190 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-40009?: CVE-2022-40009 is a critical-severity vulnerability in Swftools, classified under Use After Free. CVSS score: 9.8/10. Published 2022-09-20.
How severe is CVE-2022-40009?: Critical severity. CVSS v3 base score is 9.8 out of 10.