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CVE-2026-44638

libsixel: NULL pointer dereference

Published: May 14, 2026Updated: May 15, 2026 Sources: CVE List NVDCWE-476
2.5LOW
NVD MITRE
EPSS Score
0.1%
Top 97.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:HPR:NUI:RS:UC:NI:NA:L
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-476CWE-690

Affected Products

saitoha
oss-projectaka libsixel
libsixelLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://github.com/saitoha/libsixel/security/advisories/GHSA-wpx3-h5g8-qr3w
github.com

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