Arbitrary Code Injection The advisory has been revoked - it doesn't affect any version of package python3-tkinter (opens in a new tab)
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-RHEL10-PYTHON3TKINTER-15052833
- published22 Jan 2026
- disclosed20 Jan 2026
Introduced: 20 Jan 2026
CVE-2026-0865 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python3-tkinter package and not the python3-tkinter package as distributed by RHEL.
User-controlled header names and values containing newlines can allow injecting HTTP headers.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2431367
- https://access.redhat.com/security/cve/CVE-2026-0865
- https://access.redhat.com/errata/RHSA-2026:4713
- https://access.redhat.com/errata/RHSA-2026:7443
- https://access.redhat.com/errata/RHSA-2026:7661
- https://access.redhat.com/errata/RHSA-2026:8822
- https://access.redhat.com/errata/RHSA-2026:8824
- https://github.com/python/cpython/issues/143916
- https://github.com/python/cpython/pull/143917
- https://mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3A7CFV6IBMCAP2DWRVNT/
- https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58
- https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510
- https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2
- https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5
- https://github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995
- https://github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211
- https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6
- https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff
- https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf
- https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f
- https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97
- https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219