CVE-2026-107738

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Source

https://cve.org/CVERecord?id=CVE-2026-107738

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107738.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-107738

Aliases

GHSA-33jg-vxm6-8mxx

Published

2026-10-08T22:35:30Z

Modified

2026-10-28T11:06:09Z

Severity

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

Summary

SumatraPDF: Untrusted binary record offset used without lower-bound validation

Details

SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, ChmFile::GetCharZ() narrows file-controlled unsigned string offsets from /#WINDOWS and /#IVB to signed integers without a lower-bound check. An offset that becomes negative can make the function read before the /#STRINGS buffer, causing deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-125"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107738.json"
}

References

Affected packages

Git / github.com/sumatrapdfreader/sumatrapdf

Affected ranges

Type

GIT

Repo

https://github.com/sumatrapdfreader/sumatrapdf

Events

Introduced

Fixed

62254ed6d781ceb5cd16489bb423e7f591cd72c4

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "last_affected":  "3.6.1"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "62254ed6d781ceb5cd16489bb423e7f591cd72c4"
                }
            ],
            "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-2026-107738.json"

vanir_signatures

[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "300426981365801951799513052451881105245",
                "44003461603035836753667947272880798217",
                "191448402986654612790008150530317847510",
                "180180430064954597980864822438408456421",
                "146721603798329529223172946927666931111",
                "165441435043455372111516623351820020634",
                "94396864851667047463377388242734878832",
                "251450456216546555062597820057147573120",
                "22661630783992783968356480019813172758",
                "211191342035911755034253341575008824875",
                "128943154191505563207805769665393005696",
                "1701251640089346248700938297385306289",
                "279802294764128008045833890763108672347",
                "241932673837966555736495986171706959117",
                "158462343271890274731363222281517084689"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-107738-a40734dd",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/sumatrapdfreader/sumatrapdf/commit/62254ed6d781ceb5cd16489bb423e7f591cd72c4",
        "target":  {
            "file":  "src/ChmFile.cpp"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "312024343921472359672318793875743238885",
            "length":  386
        },
        "id":  "CVE-2026-107738-c1b66f3c",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/sumatrapdfreader/sumatrapdf/commit/62254ed6d781ceb5cd16489bb423e7f591cd72c4",
        "target":  {
            "file":  "src/ChmFile.cpp",
            "function":  "GetCharZ"
        }
    }
]

vanir_signatures_modified

"2026-10-28T11:06:09Z"