What is CVE-2022-40008?

CVE-2022-40008 is a critical-severity vulnerability in Swftools, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-09-20.

How severe is CVE-2022-40008?

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

Buffer overflow in Swftools

CVE-2022-40008

SWFTools commit 772e55a was discovered to contain a heap-buffer overflow via the function readU8 at /lib/ttf.c.

Vulnerability class: Buffer Overflow

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 (65.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.012 · change: +0.001

Affected products

Swftools — versions 2021-12-16

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/matthiaskramm/swftools/issues/188 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-40008?: CVE-2022-40008 is a critical-severity vulnerability in Swftools, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-09-20.
How severe is CVE-2022-40008?: Critical severity. CVSS v3 base score is 9.8 out of 10.