CVE-2026-25920

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Source

https://cve.org/CVERecord?id=CVE-2026-25920

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25920.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-25920

Aliases

GHSA-5mwx-65x7-cffp

Published

2026-02-09T21:32:26.520Z

Modified

2026-08-12T15:31:58.664653Z

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 has a heap out-of-bounds read in MOBI HuffDic decompressor

Details

SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, a heap out-of-bounds read vulnerability exists in SumatraPDF's MOBI HuffDic decompressor. The bounds check in AddCdicData() only validates half the range that DecodeOne() actually accesses. Opening a crafted .mobi file can read nearly (1 << codeLength) bytes beyond the CDIC dictionary buffer, leading to a crash.

Database specific

{
    "cwe_ids": [
        "CWE-125"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25920.json"
}

References

Affected packages

Git / github.com/sumatrapdfreader/sumatrapdf

Affected ranges

Type

GIT

Repo

https://github.com/sumatrapdfreader/sumatrapdf

Events

Introduced

Fixed

12b6887e9dfff874fe8749bab1bdc53d4ff075b3

Database specific

Show details

{
    "cpe": "cpe:2.3:a:sumatrapdfreader:sumatrapdf:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "3.5.2"
        }
    ]
}

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

vanir_signatures

[
    {
        "target": {
            "file": "src/MobiDoc.cpp",
            "function": "HuffDicDecompressor::SetHuffData"
        },
        "deprecated": false,
        "id": "CVE-2026-25920-9a701750",
        "signature_version": "v1",
        "digest": {
            "function_hash": "117232748217294490266174539146530574947",
            "length": 838.0
        },
        "signature_type": "Function",
        "source": "https://github.com/sumatrapdfreader/sumatrapdf/commit/12b6887e9dfff874fe8749bab1bdc53d4ff075b3"
    },
    {
        "target": {
            "file": "src/MobiDoc.cpp",
            "function": "HuffDicDecompressor::AddCdicData"
        },
        "deprecated": false,
        "id": "CVE-2026-25920-e3fc5624",
        "signature_version": "v1",
        "digest": {
            "function_hash": "287350018242290791815942785293087108917",
            "length": 736.0
        },
        "signature_type": "Function",
        "source": "https://github.com/sumatrapdfreader/sumatrapdf/commit/12b6887e9dfff874fe8749bab1bdc53d4ff075b3"
    },
    {
        "target": {
            "file": "src/MobiDoc.cpp"
        },
        "deprecated": false,
        "id": "CVE-2026-25920-e5bbf2fb",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "298600831982538125963483751285307927202",
                "60359313055809950785221283734856490973",
                "130352140609533347702064622006691316427",
                "243357575680573494118927259087660144105",
                "10603795066347093376650904837710558042",
                "47245944678176726615706817976194915650",
                "110682252844980296563670685921481200219",
                "317370050401019544382990563854595922129"
            ],
            "threshold": 0.9
        },
        "signature_type": "Line",
        "source": "https://github.com/sumatrapdfreader/sumatrapdf/commit/12b6887e9dfff874fe8749bab1bdc53d4ff075b3"
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25920.json"

vanir_signatures_modified

"2026-08-12T15:31:58Z"