CVE-2020-21049

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Source
https://cve.org/CVERecord?id=CVE-2020-21049
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-21049.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2020-21049
Downstream
Published
2021-09-14T16:15:08Z
Modified
2026-08-18T13:29:34Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

An invalid read in the stb_image.h component of libsixel prior to v1.8.5 allows attackers to cause a denial of service (DOS) via a crafted PSD file.

References

Affected packages

Git / github.com/saitoha/libsixel

Affected ranges

Type
GIT
Repo
https://github.com/saitoha/libsixel
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
933670340dcd51e41d014d83e8d693688605b773
Fixed
0b1e0b3f7b44233f84e5c9f512f8c90d6bbbe33d
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:saitoha:libsixel:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "1.8.5"
        }
    ],
    "source":  [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.14.0
v0.15.0
v0.16.0
v0.16.1
v0.17.0
v0.17.1
v0.17.2
v0.18.0
v0.19.2
v0.19.3
v0.19.4
v0.19.5
v0.19.6
v0.20.0
v0.21.0
v0.21.1
v0.22.0
v0.22.1
v0.22.2
v0.22.3
v0.23.0
v0.23.1
v0.23.2
v0.24.0
v0.24.2
v0.25.0
v0.25.1
v0.25.2
v0.25.3
v0.25.4
v0.25.5
v0.26.0
v0.27.0
v0.27.1
v0.28.0
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

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-21049.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "14053531760985046976932775092926153829",
            "length":  167
        },
        "id":  "CVE-2020-21049-300c1a47",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/saitoha/libsixel/commit/0b1e0b3f7b44233f84e5c9f512f8c90d6bbbe33d",
        "target":  {
            "file":  "src/allocator.c",
            "function":  "sixel_allocator_calloc"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "248279636798139373860926751670000785549",
            "length":  241
        },
        "id":  "CVE-2020-21049-7516b542",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/saitoha/libsixel/commit/0b1e0b3f7b44233f84e5c9f512f8c90d6bbbe33d",
        "target":  {
            "file":  "src/allocator.c",
            "function":  "sixel_allocator_malloc"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "299830155393860697827618934141247146061",
                "146241829523233735463078974435060176264",
                "191065237130737033539251958551560897080",
                "255871072765999720124756059089290237367",
                "281717664013545157945889816801227351691",
                "316609583128505174457879902511827517585",
                "6672221964126041590966727542731475682",
                "230878957094134071707425572935432296593",
                "292521596394687844652728527156577949240",
                "197698837200332871525583239750484894218",
                "184766815279878921875648068209369119125",
                "315197971923010764043084752149568680299",
                "19596710656843220683553100070881730290"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2020-21049-b7c03e43",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/saitoha/libsixel/commit/0b1e0b3f7b44233f84e5c9f512f8c90d6bbbe33d",
        "target":  {
            "file":  "src/allocator.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "265876843441913872333024852228689490945",
            "length":  171
        },
        "id":  "CVE-2020-21049-eca8721e",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/saitoha/libsixel/commit/0b1e0b3f7b44233f84e5c9f512f8c90d6bbbe33d",
        "target":  {
            "file":  "src/allocator.c",
            "function":  "sixel_allocator_realloc"
        }
    }
]
vanir_signatures_modified 
"2026-08-18T13:29:34Z"