The Pylonsproject maintains a focused set of Python web framework and utility libraries, including Colander, Horus, and WebOb, that serve as components in larger application stacks rather than end-user-facing products. Observed vulnerabilities center on application-logic and input-handling weaknesses, notably infinite loops, timing-based information disclosure, and open redirects, which are characteristic of request-processing and validation layers in web toolkits. Current severity, exploitation, and exposure counts are shown alongside this summary.
The number and severity of CVEs published that impact products developed by Pylonsproject over time
Signals from CVEs in this vendor scope (4 CVEs).
4 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2026-44889MEDIUM WebOb provides objects for HTTP requests and responses. Prior to 1.8.10, the normalization of the HTTP Location header during a redirect is vulnerable to an open redirect: WebOb jo | Jun 22, 2026 | 6.1 | 26 | NO | NO |
CVE-2017-18361HIGH In Pylons Colander through 1.6, the URL validator allows an attacker to potentially cause an infinite loop thereby causing a denial of service via an unclosed parenthesis. | Feb 1, 2019 | 7.5 | 26 | NO | NO |
CVE-2014-125056MEDIUM A vulnerability was found in Pylons horus and classified as problematic. Affected by this issue is some unknown functionality of the file horus/flows/local/services.py. The manipul | Jan 7, 2023 | 5.3 | 20 | NO | NO |
CVE-2024-42353MEDIUM WebOb provides objects for HTTP requests and responses. When WebOb normalizes the HTTP Location header to include the request hostname, it does so by parsing the URL that the user | Aug 14, 2024 | 6.1 | 19 | NO | NO |
Signals from CVEs in this vendor scope (4 CVEs).
An overview of all social media posts that mention a CVE ID that affects a product developed by Pylonsproject.
Media articles that mention a CVE ID that affects a product developed by Pylonsproject — matched by CVE ID, not by vendor name.