https://cve.radiocsirt.org Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Sun, 04 Oct 2026 13:43:40 +0000 https://cve.radiocsirt.org/vuln/cve-2026-42304 <p><strong>Affected:</strong> twisted</p> <p>Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server. This vulnerability is fixed in 26.4.0rc2.</p> <p><strong>Affected:</strong> twisted</p> <p>Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server. This vulnerability is fixed in 26.4.0rc2.</p> https://cve.radiocsirt.org/vuln/cve-2026-42304 https://cve.radiocsirt.org/vuln/ghsa-2h4p-vjrc-8xpq <p><strong>Affected:</strong> PyPI: Mako</p> <p>## Summary</p> <p>On Windows, a URI using backslash traversal (e.g. `\..\..\ secret.txt`) bypasses the directory traversal check in `Template.__init__` and the `posixpath`-based normalization in `TemplateLookup.get_template()`, allowing reads of files outside the configured template directory.</p> <p>## Details</p> <p>The root cause is a mismatch between `posixpath` (used for URI normalization in `get_template()`) and `os.path` (used for file access via `os.path.isfile()` and validation via `os.path.normpath()` in `Template.__init__`). On Windows, `os.path` is `ntpath`, which treats `\` as a path separator, while `posixpath` treats it as a literal character.</p> <p>The vulnerability chain:</p> <p>1. `get_template()` strips only leading `/` via `re.sub(r&#34;^\/+&#34;, &#34;&#34;, uri)` and normalizes with `posixpath` — backslash `\` is treated as a literal character, so `\..\ secret.txt` passes through with `..` undetected. 2. `Template.__init__()` validation uses `os.path.normpath()` — on Windows this resolves `\..\ secret.txt` to `\secret.txt`, which does not start with `..`, so the `startswith(&#34;..&#34;)` check passes. 3. `os.path.isfile()` on Windows interprets `\` as a path separator, resolving the `..` traversal and finding files outside the template directory.</p> <p>### Affected code</p> <p>- `mako/lookup.py`: `TemplateLookup.get_template()` uses `posixpath.normpath`/`posixpath.join` for path construction but `os.path.isfile()` for existence check - `mako/template.py`: `Template.__init__()` URI validation uses `os.path.normpath…</p> <p><strong>Affected:</strong> PyPI: Mako</p> <p>## Summary</p> <p>On Windows, a URI using backslash traversal (e.g. `\..\..\ secret.txt`) bypasses the directory traversal check in `Template.__init__` and the `posixpath`-based normalization in `TemplateLookup.get_template()`, allowing reads of files outside the configured template directory.</p> <p>## Details</p> <p>The root cause is a mismatch between `posixpath` (used for URI normalization in `get_template()`) and `os.path` (used for file access via `os.path.isfile()` and validation via `os.path.normpath()` in `Template.__init__`). On Windows, `os.path` is `ntpath`, which treats `\` as a path separator, while `posixpath` treats it as a literal character.</p> <p>The vulnerability chain:</p> <p>1. `get_template()` strips only leading `/` via `re.sub(r&#34;^\/+&#34;, &#34;&#34;, uri)` and normalizes with `posixpath` — backslash `\` is treated as a literal character, so `\..\ secret.txt` passes through with `..` undetected. 2. `Template.__init__()` validation uses `os.path.normpath()` — on Windows this resolves `\..\ secret.txt` to `\secret.txt`, which does not start with `..`, so the `startswith(&#34;..&#34;)` check passes. 3. `os.path.isfile()` on Windows interprets `\` as a path separator, resolving the `..` traversal and finding files outside the template directory.</p> <p>### Affected code</p> <p>- `mako/lookup.py`: `TemplateLookup.get_template()` uses `posixpath.normpath`/`posixpath.join` for path construction but `os.path.isfile()` for existence check - `mako/template.py`: `Template.__init__()` URI validation uses `os.path.normpath…</p> https://cve.radiocsirt.org/vuln/ghsa-2h4p-vjrc-8xpq