HTTP Response Splitting Affecting python package, versions [,3.10.20)[3.11.0-a1,3.11.15)[3.12.0-a1,3.12.13)[3.13.0-a1,3.13.12)[3.14.0-a1,3.14.3)[3.15.0-a1,3.15.0-a6)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published25 Jan 2026
- disclosed20 Jan 2026
- creditUnknown
Introduced: 20 Jan 2026
CVE-2026-0865 (opens in a new tab)How to fix?
Upgrade python to version 3.10.20, 3.11.15, 3.12.13, 3.13.12, 3.14.3, 3.15.0-a6 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Response Splitting via the wsgiref.headers.Headers. An attacker can manipulate HTTP responses by injecting arbitrary headers through user-controlled input containing newline characters.