CVE-2021-46700

Name: CVE-2021-46700
Creator: NVD / NIST
Published: 2022-02-19T19:15:10.96+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.82%

Last modified Jun 17, 2026

CVE-2021-46700 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.. EPSS estimates a 0.82% chance of exploitation in the next 30 days.

Description

In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

0.82%

52.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-415

Affected Software

Vendor	Product	Versions
Saitoha	Libsixel	1.8.6

References

https://github.com/saitoha/libsixel/issues/158Exploit, Issue Tracking, Third Party Advisory
https://github.com/saitoha/libsixel/issues/158Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Feb 19, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-46700?

In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.

How severe is CVE-2021-46700?

CVE-2021-46700 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.82% probability of exploitation in the next 30 days.

How do I fix CVE-2021-46700?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-46700?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST