libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any caller of these public APIs that hits a low-memory condition. This vulnerability is fixed in 1.8.7-r2.

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History

Fri, 15 May 2026 18:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:saitoha:libsixel:*:*:*:*:*:*:*:*

Fri, 15 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 14 May 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Saitoha
Saitoha libsixel
Vendors & Products Saitoha
Saitoha libsixel

Thu, 14 May 2026 20:15:00 +0000

Type Values Removed Values Added
Description libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any caller of these public APIs that hits a low-memory condition. This vulnerability is fixed in 1.8.7-r2.
Title libsixel: NULL pointer dereference
Weaknesses CWE-476
CWE-690
References
Metrics cvssV3_1

{'score': 2.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-15T14:18:03.581Z

Reserved: 2026-05-07T15:30:10.875Z

Link: CVE-2026-44638

cve-icon Vulnrichment

Updated: 2026-05-15T14:17:56.807Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-14T20:17:08.983

Modified: 2026-05-15T17:54:09.270

Link: CVE-2026-44638

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-14T22:00:09Z

Weaknesses