CVE-2026-107737

See a problem?
Please try reporting it to the source first.

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

2026-10-10T07:06:08Z

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": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "3.6.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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

"2026-10-10T07:06:08Z"