CVE-2026-25880 Untrusted Search Path in SumatraPDF Reader (explorer.exe on Windows)

SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, the PDF reader allows execution of a malicious binary explorer.exe located in the same directory as the opened PDF when the user clicks File → “Show in folder”. This behavior leads to arbitrary code execution on the victim’s...

CVE-2026-25880

SumatraPDF (Windows)

CVE-2026-25880

SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, the PDF reader allows execution of a malicious binary explorer.exe located in the same directory as the opened PDF when the user clicks File → “Show in folder”. This behavior leads to arbitrary code execution on the victim’s...

CVE-2026-25880 Untrusted Search Path in SumatraPDF Reader (explorer.exe on Windows)

SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, the PDF reader allows execution of a malicious binary explorer.exe located in the same directory as the opened PDF when the user clicks File → “Show in folder”. This behavior leads to arbitrary code execution on the victim’s...

PT-2026-7164

Name of the Vulnerable Software and Affected Versions SumatraPDF versions prior to 3.5.3 Description SumatraPDF, a multi-format reader for Windows, allows execution of a malicious binary, specifically explorer.exe, located in the same directory as an opened PDF file. This occurs when a user click...

Sumatrapdf code issue vulnerabilities

Sumatrapdf is an open-source PDF reader developed by SumatraPDF Reader. Versions of SumatraPDF 3.5.2 and earlier have code vulnerabilities. These vulnerabilities stem from the PDF reader allowing execution of malicious binary files located in the same directory as the opened PDF, potentially...

PT-2026-7171

Name of the Vulnerable Software and Affected Versions SumatraPDF versions 3.5.2 and earlier Description A heap out-of-bounds read issue exists in SumatraPDF's MOBI HuffDic decompressor. The bounds check within the AddCdicData function does not validate the complete range accessed by the DecodeOne...

PT-2026-7172

Name of the Vulnerable Software and Affected Versions SumatraPDF versions 3.5.0 through 3.5.2 Description SumatraPDF’s update process has a flaw where TLS hostname verification is disabled INTERNET FLAG IGNORE CERT CN INVALID and installers are executed without signature verification. This allows...

Sumatrapdf buffer error vulnerability

sumatrapdf is an open-source PDF reader developed by sumatrapdfreader. Versions of sumatrapdf 3.5.2 and earlier have a buffer error vulnerability. This vulnerability stems from heap out-of-bound reading in the MOBI HuffDic decompressor, which may lead to crashes...

sumatrapdf security vulnerabilities

Sumatrapdf is an open-source PDF reader developed by SumatraPDF Reader. Versions 3.5.0 to 3.5.2 of SumatraPDF have security vulnerabilities. These vulnerabilities stem from the update mechanism disabling TLS hostname verification and failing to check the installer’s signature, which may allow...

CVE-2026-25961: Improper Certificate Validation

SumatraPDF is a multi-format reader for Windows. In 3.5.0 through 3.5.2, SumatraPDF's update mechanism disables TLS hostname verification INTERNETFLAGIGNORECERTCNINVALID and executes installers without signature checks. A network attacker with any valid TLS certificate e.g., Let's Encrypt can...

CVE-2026-25880: Untrusted Search Path

SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, the PDF reader allows execution of a malicious binary explorer.exe located in the same directory as the opened PDF when the user clicks File → “Show in folder”. This behavior leads to arbitrary code execution on the victim’s...

CVE-2026-25920: Out-of-bounds Read

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...

CVE-2026-23951

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 ...

CVE-2026-23951

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 ...

CVE-2026-23951

SumatraPDF is affected by an off-by-one error in PalmDbReader::GetRecord when opening crafted Mobi files, triggering only with exactly 2 records and causing an integer underflow in the size calculation. This leads to an out-of-bounds heap read that crashes the application. The CVE notes indicate ...

CVE-2026-23951 SumatraPDF's Integer Underflow in PalmDbReader Leads to Crash

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 ...

CVE-2026-23951 SumatraPDF's Integer Underflow in PalmDbReader Leads to Crash

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 ...

CVE-2026-23951

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 ...

CVE-2026-23951 SumatraPDF's Integer Underflow in PalmDbReader Leads to Crash

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 ...