CVE-2026-1299
NoneCVSS
—
EPSS
0.6%
Published
Jan 23, 2026
CISA due date
—
The record
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".
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Bitnami | libpython | 0 | 3.15.0 |
| Bitnami | python | 0 | 3.15.0 |
| Bitnami | python-min | 0 | 3.15.0 |
| Chainguard | python-3.10 | 0 | 3.10.19-r4 |
| Chainguard | python-3.11 | 0 | 3.11.14-r6 |
| Chainguard | python-3.12 | 0 | 3.12.12-r5 |
| Chainguard | python-3.13 | 0 | 3.13.12-r1 |
| Chainguard | python-3.14 | 0 | 3.14.3-r1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Micro 5.2 | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Micro 5.2 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Micro 5.3 | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Micro 5.3 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Micro 5.4 | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Micro 5.4 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Micro 5.5 | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Micro 5.5 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | python311-core | 0 | 3.11.15-150600.3.53.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP7 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Module for Package Hub 15 SP7 | python | 0 | 2.7.18-150000.108.1 |
| SUSE:Linux Enterprise Module for Package Hub 15 SP7 | python-base | 0 | 2.7.18-150000.108.1 |
| SUSE:Linux Enterprise Module for Python 3 15 SP7 | python311 | 0 | 3.11.15-150600.3.53.1 |
| SUSE:Linux Enterprise Module for Python 3 15 SP7 | python311-core | 0 | 3.11.15-150600.3.53.1 |
| SUSE:Linux Enterprise Module for Python 3 15 SP7 | python313 | 0 | 3.13.12-150700.4.39.1 |
| SUSE:Linux Enterprise Module for Python 3 15 SP7 | python313-core | 0 | 3.13.12-150700.4.39.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | python36 | 0 | 3.6.15-103.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | python36-core | 0 | 3.6.15-103.1 |
| SUSE:Linux Enterprise Server 15 SP4-LTSS | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server 15 SP4-LTSS | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server 15 SP5-LTSS | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server 15 SP5-LTSS | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | python311 | 0 | 3.11.15-150600.3.53.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | python311-core | 0 | 3.11.15-150600.3.53.1 |
| SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | python36 | 0 | 3.6.15-103.1 |
| SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | python36-core | 0 | 3.6.15-103.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | python3 | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | python311 | 0 | 3.11.15-150600.3.53.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | python311-core | 0 | 3.11.15-150600.3.53.1 |
| Wolfi | python-3.10 | 0 | 3.10.19-r4 |
| Wolfi | python-3.11 | 0 | 3.11.14-r6 |
| Wolfi | python-3.12 | 0 | 3.12.12-r5 |
| Wolfi | python-3.13 | 0 | 3.13.12-r1 |
| Wolfi | python-3.14 | 0 | 3.14.3-r1 |
| openSUSE:Leap 15.6 | python | 0 | 2.7.18-150000.108.1 |
| openSUSE:Leap 15.6 | python-base | 0 | 2.7.18-150000.108.1 |
| openSUSE:Leap 15.6 | python-doc | 0 | 2.7.18-150000.108.1 |
| openSUSE:Leap 15.6 | python3 | 0 | 3.6.15-150300.10.109.1 |
| openSUSE:Leap 15.6 | python3-core | 0 | 3.6.15-150300.10.109.1 |
| openSUSE:Leap 15.6 | python3-documentation | 0 | 3.6.15-150300.10.109.1 |
| openSUSE:Leap 15.6 | python311 | 0 | 3.11.15-150600.3.53.1 |
| openSUSE:Leap 15.6 | python311-core | 0 | 3.11.15-150600.3.53.1 |
| openSUSE:Leap 15.6 | python311-documentation | 0 | 3.11.15-150600.3.53.1 |
| openSUSE:Leap 16.0 | python313 | 0 | 3.13.13-160000.1.1 |
| openSUSE:Leap 16.0 | python313 | 0 | 3.13.12-160000.1.1 |
| openSUSE:Leap 16.0 | python313-core | 0 | 3.13.13-160000.1.1 |
| openSUSE:Leap 16.0 | python313-core | 0 | 3.13.12-160000.1.1 |
| openSUSE:Leap 16.0 | python313-documentation | 0 | 3.13.13-160000.1.1 |
| openSUSE:Leap 16.0 | python313-documentation | 0 | 3.13.12-160000.1.1 |
| openSUSE:Leap 16.0 | python313-nogil | 0 | 3.13.13-160000.1.1 |
| openSUSE:Leap 16.0 | python313-nogil | 0 | 3.13.12-160000.1.1 |
| openSUSE:Leap 16.0 | python313-nogil-nogil-core | 0 | 3.13.13-160000.1.1 |
| openSUSE:Leap 16.0 | python313-nogil-nogil-core | 0 | 3.13.12-160000.1.1 |
| openSUSE:Tumbleweed | python310 | 0 | 3.10.20-2.1 |
| openSUSE:Tumbleweed | python311 | 0 | 3.11.15-3.1 |
| openSUSE:Tumbleweed | python312 | 0 | 3.12.12-5.1 |
| openSUSE:Tumbleweed | python313 | 0 | 3.13.12-1.1 |
| openSUSE:Tumbleweed | python314 | 0 | 3.14.3-1.1 |
Related vulnerabilities
- PSF-2026-8 The email module, specifically the "BytesGenerator" class, didn’t properly quote newlines… Same vulnerability
- CVE-2025-12781 When passing data to the b64decode(), standard_b64decode(), and urlsafe_b64decode()… Also affects libpython
- PSF-2026-7 When passing data to the b64decode(), standard_b64decode(), and urlsafe_b64decode()… Also affects libpython
- CVE-2026-0672 When using http.cookies.Morsel, user-controlled cookie values and parameters can allow… Also affects libpython
- CVE-2026-0865 User-controlled header names and values containing newlines can allow injecting HTTP… Also affects libpython
- CVE-2025-15367 The poplib module, when passed a user-controlled command, can have additional commands… Also affects libpython
- CVE-2025-15366 The imaplib module, when passed a user-controlled command, can have additional commands… Also affects libpython
- CVE-2025-11468 When folding a long comment in an email header containing exclusively unfoldable… Also affects libpython