CVE-2026-26054

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-26054
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26054.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-26054
Aliases
  • GHSA-27p6-wrfp-pgm8
Published
2026-09-24T16:48:03Z
Modified
2026-10-28T11:09:50Z
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: Heap out-of-bounds read in MOBI header parser.
Details

SumatraPDF is a multi-format reader for Windows. Prior to 3.6, the MobiDoc::ParseHeader function in src/MobiDoc.cpp validates a record using kMobiHeaderMinLen but DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without receiving the actual remaining buffer length. A malformed MOBI file can use an attacker-controlled header length to bypass optional-field early returns and cause the decoder to read beyond a short heap buffer. Opening the crafted document can crash SumatraPDF. This issue is fixed in version 3.6.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26054.json"
}
References

Affected packages

Git / github.com/sumatrapdfreader/sumatrapdf

Affected ranges

Type
GIT
Repo
https://github.com/sumatrapdfreader/sumatrapdf
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
b9732699d403ccb41f1135e0bd7f425c475e7689
Fixed
24b9ce83383bbaa48b3efe00e4d30cccea126198
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "3.6"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "24b9ce83383bbaa48b3efe00e4d30cccea126198"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "3.6rel",
            "range": [
                {
                    "fixed": "b9732699d403ccb41f1135e0bd7f425c475e7689"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

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-2026-26054.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "185646796427093350450890065906962988723",
                "243070781759185444161269719353536674736",
                "308996914305551559849290795745651728438",
                "100373262830746519796852831687471025713",
                "117247963219588739678613676312000379441",
                "266205336259815010470995742258482616136",
                "135285848865964563041555110705569359291",
                "268704177106015996712611081557011156192",
                "46894215144250998768386530072674305039",
                "16534193881323356379101028038194153944",
                "26053092189089820110733690051783168817",
                "206108745688902702008402353953648555250",
                "57695495727463019717499310688233868972",
                "46030884641734954648147176182725126308",
                "221586754141431275444763942806758830731",
                "152676865528002149235166417091905385220",
                "215962587113676591190801786072194594906"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-26054-15f564e0",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/sumatrapdfreader/sumatrapdf/commit/24b9ce83383bbaa48b3efe00e4d30cccea126198",
        "target": {
            "file": "src/MobiDoc.cpp"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "203367953200486349390816966114740057067",
                "317812094337942261380818735084580071743",
                "132034911448496112507684314363438130350",
                "24687248169840831897595657016925486454",
                "17299853333134024643525916022743327067",
                "321345430374346042347558237120481070947",
                "262247941185871653504225247979967179675",
                "203602123917659993290282641638100586430",
                "319694734599401430925459008001053404909",
                "112263597672534007598943368268685352709",
                "211905149650058363085128990357330004706",
                "173531592578407863765515380620368370274",
                "121781956140594354765335640341003624331"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-26054-6849277a",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/sumatrapdfreader/sumatrapdf/commit/b9732699d403ccb41f1135e0bd7f425c475e7689",
        "target": {
            "file": "src/CrashHandler.cpp"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "272351805133989603039436142373483039084",
            "length": 2114
        },
        "id": "CVE-2026-26054-c2f36a29",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/sumatrapdfreader/sumatrapdf/commit/24b9ce83383bbaa48b3efe00e4d30cccea126198",
        "target": {
            "file": "src/MobiDoc.cpp",
            "function": "DecodeMobiDocHeader"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "45385335526189619873983992342858613800",
            "length": 1317
        },
        "id": "CVE-2026-26054-cbe35cf0",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/sumatrapdfreader/sumatrapdf/commit/b9732699d403ccb41f1135e0bd7f425c475e7689",
        "target": {
            "file": "src/CrashHandler.cpp",
            "function": "_uploadDebugReport"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "65871902609710388966005315545789404786",
            "length": 3382
        },
        "id": "CVE-2026-26054-e9cab98f",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/sumatrapdfreader/sumatrapdf/commit/24b9ce83383bbaa48b3efe00e4d30cccea126198",
        "target": {
            "file": "src/MobiDoc.cpp",
            "function": "MobiDoc::ParseHeader"
        }
    }
]
vanir_signatures_modified 
"2026-10-28T11:09:50Z"