Medium severityOSV Advisory· Published Jan 23, 2026· Updated Apr 15, 2026
CVE-2026-1299
CVE-2026-1299
Description
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".
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
129v0.9.8, v0.9.9, v1.0.1, …+ 1 more
- (no CPE)range: v0.9.8, v0.9.9, v1.0.1, …
- (no CPE)range: not stated
- osv-coords127 versionspkg:apk/chainguard/python-3.10pkg:apk/chainguard/python-3.11pkg:apk/chainguard/python-3.12pkg:apk/chainguard/python-3.13pkg:apk/chainguard/python-3.14pkg:apk/wolfi/python-3.10pkg:apk/wolfi/python-3.11pkg:apk/wolfi/python-3.12pkg:apk/wolfi/python-3.13pkg:apk/wolfi/python-3.14pkg:bitnami/libpythonpkg:bitnami/pythonpkg:bitnami/python-minpkg:rpm/almalinux/platform-pythonpkg:rpm/almalinux/platform-python-debugpkg:rpm/almalinux/platform-python-develpkg:rpm/almalinux/python3pkg:rpm/almalinux/python3.11pkg:rpm/almalinux/python3.11-debugpkg:rpm/almalinux/python3.11-develpkg:rpm/almalinux/python3.11-idlepkg:rpm/almalinux/python3.11-libspkg:rpm/almalinux/python3.11-rpm-macrospkg:rpm/almalinux/python3.11-testpkg:rpm/almalinux/python3.11-tkinterpkg:rpm/almalinux/python3.12pkg:rpm/almalinux/python3.12-debugpkg:rpm/almalinux/python3.12-develpkg:rpm/almalinux/python3.12-idlepkg:rpm/almalinux/python3.12-libspkg:rpm/almalinux/python3.12-rpm-macrospkg:rpm/almalinux/python3.12-testpkg:rpm/almalinux/python3.12-tkinterpkg:rpm/almalinux/python3-debugpkg:rpm/almalinux/python3-develpkg:rpm/almalinux/python3-idlepkg:rpm/almalinux/python3-libspkg:rpm/almalinux/python3-testpkg:rpm/almalinux/python3-tkinterpkg:rpm/almalinux/python-unversioned-commandpkg:rpm/opensuse/python310&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python311-core&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python311&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python311&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python311-documentation&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python312&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python313-core&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python313&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python313&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python313-documentation&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python313-nogil&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python313-nogil-nogil-core&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python314&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python3-core&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python3&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python3-documentation&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python-base&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/python-doc&distro=openSUSE%20Leap%2015.6pkg:rpm/suse/python311-core&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/python311-core&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP7pkg:rpm/suse/python311-core&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/python311-core&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/python311-core&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/python311-core&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/python311&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP7pkg:rpm/suse/python311&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/python311&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/python311&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/python311&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/python313-core&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP7pkg:rpm/suse/python313-core&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/python313-core&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/python313-core&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/python313&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP7pkg:rpm/suse/python313&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/python313&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/python313&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/python313-documentation&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/python313-documentation&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/python36-core&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/python36-core&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/python36&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/python36&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/python3-base&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/python3-base&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Micro%205.2pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Micro%205.3pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Micro%205.4pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/python3-core&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Micro%205.2pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Micro%205.3pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Micro%205.4pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6pkg:rpm/suse/python3&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/python-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/python-base&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/python-base&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/python&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/python&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/python&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/python-doc&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/python-doc&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5
< 3.10.19-r4+ 126 more
- (no CPE)range: < 3.10.19-r4
- (no CPE)range: < 3.11.14-r6
- (no CPE)range: < 3.12.12-r5
- (no CPE)range: < 3.13.12-r1
- (no CPE)range: < 3.14.3-r1
- (no CPE)range: < 3.10.19-r4
- (no CPE)range: < 3.11.14-r6
- (no CPE)range: < 3.12.12-r5
- (no CPE)range: < 3.13.12-r1
- (no CPE)range: < 3.14.3-r1
- (no CPE)range: < 3.10.20
- (no CPE)range: < 3.10.20
- (no CPE)range: < 3.10.20
- (no CPE)range: < 3.6.8-73.el8_10.alma.1
- (no CPE)range: < 3.6.8-73.el8_10.alma.1
- (no CPE)range: < 3.6.8-73.el8_10.alma.1
- (no CPE)range: < 3.9.25-3.el9_7.1
- (no CPE)range: < 3.11.13-5.1.el9_7
- (no CPE)range: < 3.11.13-5.1.el9_7
- (no CPE)range: < 3.11.13-5.1.el9_7
- (no CPE)range: < 3.11.13-5.1.el9_7
- (no CPE)range: < 3.11.13-5.1.el9_7
- (no CPE)range: < 3.11.13-5.el8_10
- (no CPE)range: < 3.11.13-5.1.el9_7
- (no CPE)range: < 3.11.13-5.1.el9_7
- (no CPE)range: < 3.12.12-4.el9_7.1
- (no CPE)range: < 3.12.12-4.el9_7.1
- (no CPE)range: < 3.12.12-4.el9_7.1
- (no CPE)range: < 3.12.12-4.el9_7.1
- (no CPE)range: < 3.12.12-4.el9_7.1
- (no CPE)range: < 3.12.12-3.el8_10
- (no CPE)range: < 3.12.12-4.el9_7.1
- (no CPE)range: < 3.12.12-4.el9_7.1
- (no CPE)range: < 3.9.25-3.el9_7.1
- (no CPE)range: < 3.9.25-3.el9_7.1
- (no CPE)range: < 3.6.8-73.el8_10.alma.1
- (no CPE)range: < 3.6.8-73.el8_10.alma.1
- (no CPE)range: < 3.6.8-73.el8_10.alma.1
- (no CPE)range: < 3.6.8-73.el8_10.alma.1
- (no CPE)range: < 3.9.25-3.el9_7.1
- (no CPE)range: < 3.10.20-2.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-3.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.12.12-5.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.14.3-1.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 2.7.18-150000.108.1
- (no CPE)range: < 2.7.18-150000.108.1
- (no CPE)range: < 2.7.18-150000.108.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-2.1
- (no CPE)range: < 3.11.15-slfo.1.1_2.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-150600.3.53.1
- (no CPE)range: < 3.11.15-2.1
- (no CPE)range: < 3.11.15-slfo.1.1_2.1
- (no CPE)range: < 3.13.12-150700.4.39.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-150700.4.39.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.13.12-160000.1.1
- (no CPE)range: < 3.6.15-103.1
- (no CPE)range: < 3.6.15-103.1
- (no CPE)range: < 3.6.15-103.1
- (no CPE)range: < 3.6.15-103.1
- (no CPE)range: < 3.4.10-25.175.1
- (no CPE)range: < 3.4.10-25.175.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.4.10-25.175.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.6.15-150300.10.109.1
- (no CPE)range: < 3.4.10-25.175.1
- (no CPE)range: < 2.7.18-150000.108.1
- (no CPE)range: < 2.7.18-33.69.1
- (no CPE)range: < 2.7.18-33.69.1
- (no CPE)range: < 2.7.18-150000.108.1
- (no CPE)range: < 2.7.18-33.69.1
- (no CPE)range: < 2.7.18-33.69.1
- (no CPE)range: < 2.7.18-33.69.1
- (no CPE)range: < 2.7.18-33.69.1
Patches
Vulnerability mechanics
References
10- cve.org/CVERecordnvd
- github.com/python/cpython/commit/052e55e7d44718fe46cbba0ca995cb8fcc359413nvd
- github.com/python/cpython/commit/0a925ab591c45d6638f37b5e57796f36fa0e56d8nvd
- github.com/python/cpython/commit/7877fe424415bc4a13045e62a90a7277413d8cb9nvd
- github.com/python/cpython/commit/842ce19a0c0b58d61591e8f6a708c38db1fb94e4nvd
- github.com/python/cpython/commit/8cdf6204f4ae821f32993f8fc6bad0d318f95f36nvd
- github.com/python/cpython/commit/e417f05ad77a4c30ddc07f99e90fc0cef43e831anvd
- github.com/python/cpython/issues/144125nvd
- github.com/python/cpython/pull/144126nvd
- mail.python.org/archives/list/security-announce@python.org/thread/6ZZULGALJTITEAGEXLDJE2C6FORDXPBT/nvd
News mentions
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