CVE-2026-23951

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

Source

https://cve.org/CVERecord?id=CVE-2026-23951

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23951.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-23951

Aliases

GHSA-hj4w-c5x8-p2hv

Published

2026-01-22T00:17:10Z

Modified

2026-10-28T02:31:12Z

Severity

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

Summary

SumatraPDF's Integer Underflow in PalmDbReader Leads to Crash

Details

SumatraPDF is a multi-format reader for Windows. All versions contain an off-by-one error in the validation code that only triggers with exactly 2 records, causing an integer underflow in the size calculation. This bug exists in PalmDbReader::GetRecord when opening a crafted Mobi file, resulting in an out-of-bounds heap read that crashes the app. There are no published fixes at the time of publication.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125",
        "CWE-191"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23951.json"
}

References

Affected packages

Git / github.com/sumatrapdfreader/sumatrapdf

Affected ranges

Type

GIT

Repo

https://github.com/sumatrapdfreader/sumatrapdf

Events

Introduced

Last Affected

646d1feddcc80b3b51072c5b27a1446487904175

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "last_affected": "3.5.2rel"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        }
    ]
}

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

3.5.1rel

3.5.2rel

3.5rel

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23951.json"