CVE-2026-26054

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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

2026-09-25T08:11:23Z

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

Fixed

b9732699d403ccb41f1135e0bd7f425c475e7689

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "3.6"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

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":  [
                "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":  "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"
        }
    }
]

vanir_signatures_modified

"2026-09-25T08:11:23Z"