CVE-2026-107737

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Source

https://cve.org/CVERecord?id=CVE-2026-107737

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107737.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-107737

Aliases

GHSA-8p34-f32f-7rmq

Published

2026-10-08T22:34:16Z

Modified

2026-10-28T10:51:11Z

Severity

5.7 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

SumatraPDF CHM `its://` signed index causes an out-of-bounds object lookup

Details

SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, and in pre-release 3.7.0.20369 when WebView2 is absent or cannot initialize, ParseProtoUrl() accepts the signed host component of an its:// URL and FindHtmlWindowById() uses it directly as an index into gHtmlWindows. Opening a crafted CHM through the IE fallback backend with a negative or otherwise out-of-range window identifier can cause an out-of-bounds pointer read followed by an invalid object callback dereference and process termination. No fixed version is available as of this review.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-129"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107737.json"
}

References

Affected packages

Git / github.com/sumatrapdfreader/sumatrapdf

Affected ranges

Type

GIT

Repo

https://github.com/sumatrapdfreader/sumatrapdf

Events

Introduced

Fixed

596c7e26e983549a77a3a38cae1147ab73792929

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "last_affected":  "3.6.1"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "596c7e26e983549a77a3a38cae1147ab73792929"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

1.*

1.4split

1.5split

1.6split

1.7split

1.8split

1.9split

2.*

2.0split

2.1split

2.2split

2.3split

2.4split

2.5split

3.*

3.0split

3.1.2rel

3.2

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107737.json"

vanir_signatures

[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "313923021044167969583392724138431684161",
                "142563719783934443657751127588730127084",
                "269928050847192063991418633618554423284",
                "163127409971232477253274924047211537254"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-107737-6e1b4fde",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/sumatrapdfreader/sumatrapdf/commit/596c7e26e983549a77a3a38cae1147ab73792929",
        "target":  {
            "file":  "src/wingui/HtmlWindow.cpp"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "28124119988523577615371240111662391885",
            "length":  68
        },
        "id":  "CVE-2026-107737-793a4205",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/sumatrapdfreader/sumatrapdf/commit/596c7e26e983549a77a3a38cae1147ab73792929",
        "target":  {
            "file":  "src/wingui/HtmlWindow.cpp",
            "function":  "FindHtmlWindowById"
        }
    }
]

vanir_signatures_modified

"2026-10-28T10:51:11Z"