CVE-2026-44638

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Source
https://cve.org/CVERecord?id=CVE-2026-44638
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44638.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-44638
Aliases
  • GHSA-wpx3-h5g8-qr3w
Downstream
Published
2026-05-14T19:59:29Z
Modified
2026-08-12T03:51:27Z
Severity
  • 2.5 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L CVSS Calculator
Summary
libsixel: NULL pointer dereference
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-476",
        "CWE-690"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44638.json"
}
References

Affected packages

Git / github.com/saitoha/libsixel

Affected ranges

Type
GIT
Repo
https://github.com/saitoha/libsixel
Events
Introduced
cf6b1c58f7505dec57de0f901bf23b67f5a4e316
Fixed
764f4e618c8bbc427fb74622e3227243fe6762fb
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:saitoha:libsixel:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.0.0"
        },
        {
            "fixed": "1.8.7-r2"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

Other
nightly-latest
v1.*
v1.0.0
v1.0.1
v1.0.2
v1.1.0
v1.1.1
v1.1.2
v1.3.1
v1.3.2
v1.3.3
v1.3.4
v1.3.5
v1.3.6
v1.4.0
v1.4.1
v1.4.10
v1.4.11
v1.4.12
v1.4.13
v1.4.2
v1.4.3
v1.4.4
v1.4.5
v1.4.6
v1.4.7
v1.4.8
v1.4.9
v1.5.0
v1.5.1
v1.5.2
v1.6.1
v1.7.1
v1.7.2
v1.7.3
v1.8.0
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.8.5
v1.8.6
v1.8.7
v1.8.7-r1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44638.json"