What is CVE-2019-3573?

CVE-2019-3573 is a medium-severity vulnerability in Saitoha Libsixel, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2019-01-02.

How severe is CVE-2019-3573?

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

Vulnerability in Saitoha Libsixel

CVE-2019-3573

In libsixel v1.8.2, there is an infinite loop in the function sixel_decode_raw_impl() in the file fromsixel.c, as demonstrated by sixel2png.

Published 2019-01-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (59.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.8% 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: 0.010 · change: -0.000

Affected products

Saitoha Libsixel — versions 1.8.2

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

github.com/TeamSeri0us/pocs/tree/master/libsixel (Exploit, Third Party Advisory)
github.com/saitoha/libsixel/issues/83 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-3573?: CVE-2019-3573 is a medium-severity vulnerability in Saitoha Libsixel, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2019-01-02.
How severe is CVE-2019-3573?: Medium severity. CVSS v3 base score is 5.5 out of 10.