CVE-2026-33020

medium Red Hat
CVSS v3 Base Score
7.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
EPSS Score
0.0%
Exploitation probability in 30 days
Top 93% most likely to be exploited
Attack Characteristics
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
None
Integrity
High
Availability
High
Published: April 14, 2026 (86 days ago)
Last Modified: April 14, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in libsixel. An integer overflow vulnerability in the `sixel_frame_convert_to_rgb888()` function can lead to a heap buffer overflow when processing specially crafted large palettised PNG images. An attacker can exploit this by providing a malicious image, which causes heap corruption in the victim's process. This can result in a denial of service due to a reliable crash and potentially allow for arbitrary code execution.

CWE

CWE-190

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com 🔗 github.com