CVE-2026-33021

Katalog CVE

CVSS 7.3 · High EPSS 0,21%

Kerentanan Use After Free pada saitoha libsixel. Skor CVSS 3.1 7.3 (High) menurut github.com.

Deskripsi (NVD)

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a use-after-free vulnerability in sixel_encoder_encode_bytes() because sixel_frame_init() stores the caller-owned pixel buffer pointer directly in frame->pixels without making a defensive copy. When a resize operation is triggered, sixel_frame_convert_to_rgb888() unconditionally frees this caller-owned buffer and replaces it with a new internal allocation, leaving the caller with a dangling pointer. Any subsequent access to the original buffer by the caller constitutes a use-after-free, confirmed by AddressSanitizer. An attacker who controls incoming frames can trigger this bug repeatedly and predictably, resulting in a reliable crash with potential for code execution. This issue has been fixed in version 1.8.7-r1.

Rincian

Terbit di NVD

14 April 2026

Terakhir diubah

25 Juli 2026

Status NVD

Analyzed

CVSS 3.1

7.3 (High), sumber github.com
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-416: Use After Free

EPSS (30 hari)

0,21% peluang dieksploitasi; lebih tinggi dari 10,5% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/saitoha/libsixel/security/advisories/GHSA-j6m5-2cc7-3whc exploit · advisory vendor
• https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1 release notes