CVE-2026-25961

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Source

https://cve.org/CVERecord?id=CVE-2026-25961

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25961.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-25961

Aliases

GHSA-xpm2-rr5m-x96q

Published

2026-02-09T21:34:05Z

Modified

2026-08-12T03:51:24Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator

Summary

SumatraPDF Update MITM -> Arbitrary Code Execution

Details

SumatraPDF is a multi-format reader for Windows. In 3.5.0 through 3.5.2, SumatraPDF's update mechanism disables TLS hostname verification (INTERNET_FLAG_IGNORE_CERT_CN_INVALID) and executes installers without signature checks. A network attacker with any valid TLS certificate (e.g., Let's Encrypt) can intercept the update check request, inject a malicious installer URL, and achieve arbitrary code execution.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-295",
        "CWE-494"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25961.json"
}

References

Affected packages

Git / github.com/sumatrapdfreader/sumatrapdf

Affected ranges

Type

GIT

Repo

https://github.com/sumatrapdfreader/sumatrapdf

Events

Introduced

bd84decaa54254d42dd3eda35399c5dd1b3ab57e

Last Affected

646d1feddcc80b3b51072c5b27a1446487904175

Database specific

Show details

{
    "cpe": "cpe:2.3:a:sumatrapdfreader:sumatrapdf:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "3.5.0"
        },
        {
            "last_affected": "3.5.2"
        },
        {
            "introduced": "3.5"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

3.*

3.5.1rel

3.5.2rel

3.5rel

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25961.json"