What is CVE-2022-27938?

CVE-2022-27938 is a medium-severity vulnerability in Libsixel, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2022-03-26.

How severe is CVE-2022-27938?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Libsixel

CVE-2022-27938

stb_image.h (aka the stb image loader) 2.19, as used in libsixel and other products, has a reachable assertion in stbi__create_png_image_raw.

Published 2022-03-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

github.com/saitoha/libsixel/issues/163 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2022-27938?: CVE-2022-27938 is a medium-severity vulnerability in Libsixel, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2022-03-26.
How severe is CVE-2022-27938?: Medium severity. CVSS v3 base score is 5.5 out of 10.