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SUSE Python3 Important Header Injection Vuln 2026-1090-1 CVE-2026-1299

suse
Calendar Grey March 27, 2026
Dist Suse Esm H88
Critical security update for python3 to address important issues including header injection vulnerability.
An update that solves one vulnerability can now be installed.

Summary

## This update for python3 fixes the following issues: * CVE-2026-1299: header injection when an email is serialized due to improper newline quoting in BytesGenerator (bsc#1257181). ## Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST online_update or "zypper patch". Alternatively you can run the command listed for your product: * openSUSE Leap 15.3 zypper in -t patch SUSE-2026-1090=1 * openSUSE Leap 15.6 zypper in -t patch openSUSE-SLE-15.6-2026-1090=1 * SUSE Linux Enterprise Micro for Rancher 5.3 zypper in -t patch SUSE-SLE-Micro-5.3-2026-1090=1 * SUSE Linux Enterprise Micro 5.3 zypper in -t patch SUSE-SLE-Micro-5.3-2026-1090=1 * SUSE Linux Enterprise Micro for Rancher 5.4 zypper in -t patch SUSE-SLE-Micro-5.4-2026-1090=1

Topics%20covered

Topics Covered

security advisory SuSE important header injection python3 cve-2026-1299

References

* bsc#1257181

Cross-

* CVE-2026-1299

CVSS scores:

* CVE-2026-1299 ( SUSE ): 8.3

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

* CVE-2026-1299 ( SUSE ): 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

* CVE-2026-1299 ( NVD ): 6.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected Products:

* Basesystem Module 15-SP7

* Development Tools Module 15-SP7

* openSUSE Leap 15.3

* openSUSE Leap 15.6

* SUSE Linux Enterprise Desktop 15 SP7

* SUSE Linux Enterprise High Performance Computing 15 SP4

* SUSE Linux Enterprise High Performance Computing 15 SP5

* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:1090-1
Release Date: 2026-03-26T17:46:03Z
Rating: important

Topics%20covered

Topics Covered

security advisory SuSE important header injection python3 cve-2026-1299

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