Updated: 2025-11-19 05:39:55.088039
Description:
There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | MEDIUM | 4.0 |
| CVSS Version 3.x | MEDIUM | 6.5 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| Alpine Linux 3.22 | python | 3.9 | 6.5 | MEDIUM | Not Vulnerable | 2026-02-02 14:29:58 | Not affected: the Python runtime in use is 3.9.23, which already includes the upstream fix for the u... | |
| Alpine Linux 3.22 | python | 3.7 | 6.5 | MEDIUM | Not Vulnerable | 2026-02-16 14:41:28 | Not affected: the Python runtime in use is 3.9.23, which already includes the upstream fix for the u... | |
| Alpine Linux 3.22 | python | 3.8 | 6.5 | MEDIUM | Not Vulnerable | 2026-02-07 04:07:55 | Not affected: the Python runtime in use is 3.9.23, which already includes the upstream fix for the u... | |
| Alpine Linux 3.22 | python | 3.6 | 6.5 | MEDIUM | Not Vulnerable | 2026-01-27 16:43:57 | Not affected: the Python runtime in use is 3.9.23, which already includes the upstream fix for the u... | |
| Debian 10 | python | 3.6 | 6.5 | MEDIUM | Already Fixed | 2025-09-09 19:26:50 | ||
| Debian 10 | python | 2.7 | 6.5 | MEDIUM | Released | CLSA-2025:1760705864 | 2025-10-17 14:05:45 | |
| Debian 11 | python | 2.7 | 6.5 | MEDIUM | Released | CLSA-2025:1760705964 | 2025-10-17 14:05:44 | |
| Debian 11 | python | 3.6 | 6.5 | MEDIUM | Already Fixed | 2025-09-09 19:26:49 | ||
| Debian 12 | python | 3.9 | 6.5 | MEDIUM | Not Vulnerable | 2025-12-11 07:44:52 | Not affected: the Python runtime in use is 3.9.23, which already includes the upstream fix for the u... | |
| Debian 12 | python | 3.7 | 6.5 | MEDIUM | Not Vulnerable | 2025-12-11 07:46:30 | Not affected: the Python runtime in use is 3.9.23, which already includes the upstream fix for the u... |