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Python html.parser.HTMLParserIncremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations

Risk 50
Severity
8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.

First published (updated )
CVE-2026-15308

Python Software Foundation CPythonwebbrowser.open() allows leading dashes in URLs

Risk 47
Severity
7
EPSS
0.03%
Input Validation
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Last updated 6 July 2026

1 / 5
Source: Ubuntu
First published (updated )
CVE-2026-4519

python/http.clientExcessive read buffering DoS in http.client

Risk 46
Severity
6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Excessive read buffering DoS in http.client

1 / 2
Source: Microsoft
First published (updated )
CVE-2025-13836

pypi/cpythonQuadratic complexity in node ID cache clearing

Risk 31
Severity
6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Quadratic complexity in node ID cache clearing

1 / 2
Source: Microsoft
First published (updated )
CVE-2025-12084

Python Software Foundation CPythonThe expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

Risk 32
Severity
6.3
EPSS
0.06%
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

xml.parsers.expat and xml.etree.ElementTree use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

1 / 2
Source: MITRE
First published (updated )
CVE-2026-7210

Python CPythonIncomplete control character validation in http.cookies

Risk 32
Severity
6
EPSS
0.11%
Input Validation
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Incomplete control character validation in http.cookies

1 / 3
Source: Microsoft
First published (updated )
CVE-2026-3644

Python CPythonStack overflow parsing XML with deeply nested DTD content models

Risk 32
Severity
6
EPSS
0.03%
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Last updated 6 July 2026

1 / 4
Source: Ubuntu
First published (updated )
CVE-2026-4224

Python Python (shutil.unpack_archive)shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs

Risk 46
Severity
6
Path Traversal
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

If shutil.unpackarchive() is given a ZIP archive with an absolute Windows path containing a drive (C:\\...) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.

1 / 2
Source: MITRE
First published (updated )
CVE-2026-3087

Python configparserConfiguration Injection via Carriage Return (\r) in write() method

Risk 32
Severity
4.1
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Configuration Injection via Carriage Return (\r) in write() method

1 / 2
Source: Microsoft
First published (updated )
CVE-2026-0864

Python Software Foundation PythonOut-of-memory when loading Plist

Risk 34
Severity
2.1
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Out-of-memory when loading Plist

1 / 2
Source: Microsoft
First published (updated )
CVE-2025-13837

pypi/tarfiletarfile: Skip DIRTYPE normalization during GNU LONGNAME/LONGLINK handling

Risk 18
Severity
2
Input Validation, Malicious File Upload
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

tarfile: Skip DIRTYPE normalization during GNU LONGNAME/LONGLINK handling

1 / 2
Source: Microsoft
First published (updated )
CVE-2025-13462

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