PT-2022-12325 · Libsixel+1 · Libsixel+1

Eldstal · Published 2022-01-25 · Updated 2022-01-28 · CVE-2021-45340

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Libsixel versions prior to and including v1.10.3

Description A NULL pointer dereference in the stb image.h component of libsixel allows attackers to cause a denial of service (DOS) via a crafted PICT file. This issue affects Libsixel and can be exploited by attackers to disrupt service.

Recommendations For versions prior to and including v1.10.3, update to a version later than v1.10.3 to resolve the issue. As a temporary workaround, consider restricting the processing of PICT files to minimize the risk of exploitation.

Exploit

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2026-06433

CVE-2021-45340

Affected Products

Debian

Libsixel

References · 14

• 🔥 https://github.com/libsixel/libsixel/issues/51 · Exploit
• https://cve.org/CVERecord?id=CVE-2021-45340 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-45340 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2026-0518SE47 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-45340 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-45340 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-45340 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-45340 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06433 · Security Note
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2026-0421SE17 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-45340 · Security Note
• https://github.com/saitoha/libsixel/commit/1c58a6ea708b6fa793ffb5a10798ccfea36e8eed · Note
• https://t.me/cvenotify/25820 · Telegram Post
• https://t.me/cibsecurity/36196 · Telegram Post