python: Quadratic complexity in os.path.expandvars() with user-controlled template

A vulnerability in Python’s os.path.expandvars function that can cause performance degradation. When processing specially crafted, user-controlled input with nested environment variable patterns, the function exhibits quadratic time complexity, potentially leading to excessive CPU usage and denia...

CVE-2026-102990

basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RELINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group field...

CVE-2026-103000

The pypdf pure-python PDF library is vulnerable to a memory exhaustion issue in versions prior to 6.19.0 . A crafted PDF can contain unusually large alphabetical page-label values, causing pypdf/_page_labels.py to generate excessively long strings during label retrieval. This excessive memory con...

CVE-2026-103000 pypdf: Possible large memory usage when retrieving alphabetical page labels

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/pagelabels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming...

CVE-2026-103000 pypdf: Possible large memory usage when retrieving alphabetical page labels

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/pagelabels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming...

CVE-2026-102996 pypdf: Possible large memory usage when parsing font data

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/font.py Font.collectttt1characterwidths to process entries beyond the 256 character codes meaningful for a simpl...

CVE-2026-102996 pypdf: Possible large memory usage when parsing font data

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/font.py Font.collectttt1characterwidths to process entries beyond the 256 character codes meaningful for a simpl...

CVE-2026-102995 pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/cmap.py parsebfchar to decode and retain oversized values during operations such as text extractio...

CVE-2026-102995 pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/cmap.py parsebfchar to decode and retain oversized values during operations such as text extractio...

CVE-2026-102995 pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/cmap.py parsebfchar to decode and retain oversized values during operations such as text extractio...

CVE-2026-102994

The pypdf pure-python PDF library is vulnerable to long runtimes and large memory usage in versions prior to 6.18.0 . A crafted PDF containing indirect-object identifiers or generation-number tokens without whitespace can cause the pypdf/_reader.py and pypdf/generic/_base.py components to scan ex...

CVE-2026-102994 pypdf: Possible long runtimes/large memory usage when parsing indirect objects

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.0, a crafted PDF containing indirect-object identifiers or generation-number tokens that continue for a long time without whitespace can cause pypdf/reader.py and pypdf/generic/base.py to scan excessive input through...

CVE-2026-102993 pypdf: Possible large memory usage when retrieving Roman page labels

pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/pagelabels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of...

CVE-2026-102993 pypdf: Possible large memory usage when retrieving Roman page labels

pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/pagelabels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of...

CVE-2026-102993

The pypdf pure-python PDF library is vulnerable to excessive memory consumption in versions prior to 6.17.0 . A crafted PDF can provide unusually large Roman page-label values, causing pypdf/_page_labels.py to generate excessively large numeral strings. This occurs when an application retrieves d...

CVE-2026-102990

basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RELINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group field...

CLEANSTART-2026-AJ28533 Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service

Security vulnerability affects the containerd package. Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service...

urllib3: Chunked Deflate streaming can enter an infinite loop

Impact urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading content in chunks instead of loading the entire response body into memory at once. urllib3 can decompress response bodies according to the HTTP Content-Encoding header. When streaming a...

GHSA-GH4C-6FX4-QH6G urllib3: Chunked Deflate streaming can enter an infinite loop

Impact urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading content in chunks instead of loading the entire response body into memory at once. urllib3 can decompress response bodies according to the HTTP Content-Encoding header. When streaming a...

PyJWT: ReDoS vulnerability when calling the `is_pem_format` function.

Summary There is a Re-DoS vulnerability in the ispemformat function which results in a intesive CPU usage if an attacker is been able to provide a custom certificate. Details The problem is that the lazy quantifier .+? will always first try to match as little as possible until it finds a ---- END...