CVE-2026-1299 The advisory has been revoked - it doesn't affect any version of package python3-tkinter (opens in a new tab)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.
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Test your applications- Snyk IDSNYK-ALMALINUX10-PYTHON3TKINTER-15758393
- published23 Mar 2026
- disclosed10 Mar 2026
Introduced: 10 Mar 2026
CVE-2026-1299 (opens in a new tab)Amendment
The AlmaLinux security team deemed this advisory irrelevant for AlmaLinux: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 AlmaLinux.
The email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized. This is only applicable if using "LiteralHeader" writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in "BytesGenerator".
References
- https://errata.almalinux.org/8/ALSA-2026-2128.html
- https://errata.almalinux.org/9/ALSA-2026-4165.html
- https://errata.almalinux.org/9/ALSA-2026-4168.html
- https://errata.almalinux.org/9/ALSA-2026-4216.html
- https://errata.almalinux.org/8/ALSA-2026-4463.html
- https://errata.almalinux.org/8/ALSA-2026-4473.html
- https://errata.almalinux.org/10/ALSA-2026-4713.html
- https://access.redhat.com/security/cve/CVE-2026-1299
- https://www.redhat.com/security/data/cve/CVE-2026-1299.html
- https://access.redhat.com/errata/RHSA-2026:2128
- https://access.redhat.com/errata/RHSA-2026:4165
- https://access.redhat.com/errata/RHSA-2026:4168
- https://access.redhat.com/errata/RHSA-2026:4216
- https://access.redhat.com/errata/RHSA-2026:4463
- https://access.redhat.com/errata/RHSA-2026:4473
- https://access.redhat.com/errata/RHSA-2026:4713
- https://cve.org/CVERecord?id=CVE-2024-6923
- https://github.com/python/cpython/commit/052e55e7d44718fe46cbba0ca995cb8fcc359413
- https://github.com/python/cpython/issues/144125
- https://github.com/python/cpython/pull/144126
- https://mail.python.org/archives/list/security-announce@python.org/thread/6ZZULGALJTITEAGEXLDJE2C6FORDXPBT/
- https://github.com/python/cpython/commit/0a925ab591c45d6638f37b5e57796f36fa0e56d8
- https://github.com/python/cpython/commit/7877fe424415bc4a13045e62a90a7277413d8cb9
- https://github.com/python/cpython/commit/842ce19a0c0b58d61591e8f6a708c38db1fb94e4
- https://github.com/python/cpython/commit/8cdf6204f4ae821f32993f8fc6bad0d318f95f36
- https://github.com/python/cpython/commit/e417f05ad77a4c30ddc07f99e90fc0cef43e831a