Vulnerability Details CVE-2026-44638
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.9%
CVSS Severity
CVSS v3 Score 2.5
References
Products affected by CVE-2026-44638
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cpe:2.3:a:saitoha:libsixel:1.0.0
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cpe:2.3:a:saitoha:libsixel:1.0.1
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cpe:2.3:a:saitoha:libsixel:1.0.2
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cpe:2.3:a:saitoha:libsixel:1.0.3
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cpe:2.3:a:saitoha:libsixel:1.1.0
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cpe:2.3:a:saitoha:libsixel:1.1.1
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cpe:2.3:a:saitoha:libsixel:1.1.2
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cpe:2.3:a:saitoha:libsixel:1.1.3
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cpe:2.3:a:saitoha:libsixel:1.1.4
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cpe:2.3:a:saitoha:libsixel:1.1.5
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cpe:2.3:a:saitoha:libsixel:1.2.0
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cpe:2.3:a:saitoha:libsixel:1.2.1
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cpe:2.3:a:saitoha:libsixel:1.2.2
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cpe:2.3:a:saitoha:libsixel:1.2.3
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cpe:2.3:a:saitoha:libsixel:1.3.0
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cpe:2.3:a:saitoha:libsixel:1.3.1
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cpe:2.3:a:saitoha:libsixel:1.3.2
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cpe:2.3:a:saitoha:libsixel:1.3.3
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cpe:2.3:a:saitoha:libsixel:1.3.4
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cpe:2.3:a:saitoha:libsixel:1.3.5
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cpe:2.3:a:saitoha:libsixel:1.3.6
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cpe:2.3:a:saitoha:libsixel:1.4.0
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cpe:2.3:a:saitoha:libsixel:1.4.1
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cpe:2.3:a:saitoha:libsixel:1.4.10
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cpe:2.3:a:saitoha:libsixel:1.4.11
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cpe:2.3:a:saitoha:libsixel:1.4.12
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cpe:2.3:a:saitoha:libsixel:1.4.13
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cpe:2.3:a:saitoha:libsixel:1.4.2
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cpe:2.3:a:saitoha:libsixel:1.4.3
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cpe:2.3:a:saitoha:libsixel:1.4.4
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cpe:2.3:a:saitoha:libsixel:1.4.5
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cpe:2.3:a:saitoha:libsixel:1.4.6
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cpe:2.3:a:saitoha:libsixel:1.4.7
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cpe:2.3:a:saitoha:libsixel:1.4.8
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cpe:2.3:a:saitoha:libsixel:1.4.9
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cpe:2.3:a:saitoha:libsixel:1.5.0
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cpe:2.3:a:saitoha:libsixel:1.5.1
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cpe:2.3:a:saitoha:libsixel:1.5.2
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cpe:2.3:a:saitoha:libsixel:1.5.3
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cpe:2.3:a:saitoha:libsixel:1.6.0
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cpe:2.3:a:saitoha:libsixel:1.6.1
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cpe:2.3:a:saitoha:libsixel:1.7.0
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cpe:2.3:a:saitoha:libsixel:1.7.1
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cpe:2.3:a:saitoha:libsixel:1.7.2
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cpe:2.3:a:saitoha:libsixel:1.7.3
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cpe:2.3:a:saitoha:libsixel:1.8.0
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cpe:2.3:a:saitoha:libsixel:1.8.1
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cpe:2.3:a:saitoha:libsixel:1.8.2
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cpe:2.3:a:saitoha:libsixel:1.8.3
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cpe:2.3:a:saitoha:libsixel:1.8.4
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cpe:2.3:a:saitoha:libsixel:1.8.5
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cpe:2.3:a:saitoha:libsixel:1.8.6
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cpe:2.3:a:saitoha:libsixel:1.8.7
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cpe:2.3:a:saitoha:libsixel:1.8.7-r1