Bug 2432437 (CVE-2026-1299) - CVE-2026-1299 cpython: email header injection due to unquoted newlines
Summary: CVE-2026-1299 cpython: email header injection due to unquoted newlines
Keywords:
Status: NEW
Alias: CVE-2026-1299
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2433810 2433813 2433823 2433811 2433812 2433814 2433815 2433816 2433817 2433818 2433819 2433820 2433821 2433822 2433824 2433825 2433826 2433827 2433828 2433829 2433830 2433831 2433832
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-23 17:03 UTC by OSIDB Bzimport
Modified: 2026-04-02 12:01 UTC (History)
18 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:2239 0 None None None 2026-02-09 02:10:36 UTC
Red Hat Product Errata RHBA-2026:2377 0 None None None 2026-02-09 23:44:52 UTC
Red Hat Product Errata RHBA-2026:2666 0 None None None 2026-02-12 15:34:17 UTC
Red Hat Product Errata RHBA-2026:2668 0 None None None 2026-02-12 15:27:13 UTC
Red Hat Product Errata RHBA-2026:4332 0 None None None 2026-03-11 15:06:58 UTC
Red Hat Product Errata RHBA-2026:4393 0 None None None 2026-03-11 20:42:05 UTC
Red Hat Product Errata RHBA-2026:4593 0 None None None 2026-03-16 14:45:54 UTC
Red Hat Product Errata RHSA-2026:2128 0 None None None 2026-02-05 15:34:36 UTC
Red Hat Product Errata RHSA-2026:4165 0 None None None 2026-03-10 09:27:07 UTC
Red Hat Product Errata RHSA-2026:4168 0 None None None 2026-03-10 09:51:35 UTC
Red Hat Product Errata RHSA-2026:4216 0 None None None 2026-03-10 22:28:28 UTC
Red Hat Product Errata RHSA-2026:4463 0 None None None 2026-03-12 12:28:06 UTC
Red Hat Product Errata RHSA-2026:4473 0 None None None 2026-03-12 13:30:30 UTC
Red Hat Product Errata RHSA-2026:4713 0 None None None 2026-03-17 10:33:36 UTC
Red Hat Product Errata RHSA-2026:4746 0 None None None 2026-03-17 11:04:33 UTC
Red Hat Product Errata RHSA-2026:5152 0 None None None 2026-03-19 17:53:38 UTC
Red Hat Product Errata RHSA-2026:5215 0 None None None 2026-03-23 02:29:56 UTC
Red Hat Product Errata RHSA-2026:5216 0 None None None 2026-03-23 01:30:35 UTC
Red Hat Product Errata RHSA-2026:5218 0 None None None 2026-03-23 02:33:18 UTC
Red Hat Product Errata RHSA-2026:5219 0 None None None 2026-03-23 02:14:18 UTC
Red Hat Product Errata RHSA-2026:5220 0 None None None 2026-03-23 02:36:54 UTC
Red Hat Product Errata RHSA-2026:5221 0 None None None 2026-03-23 01:38:37 UTC
Red Hat Product Errata RHSA-2026:5223 0 None None None 2026-03-23 02:13:50 UTC
Red Hat Product Errata RHSA-2026:5225 0 None None None 2026-03-23 03:23:40 UTC
Red Hat Product Errata RHSA-2026:5226 0 None None None 2026-03-23 03:46:07 UTC
Red Hat Product Errata RHSA-2026:5315 0 None None None 2026-03-23 05:20:27 UTC
Red Hat Product Errata RHSA-2026:5399 0 None None None 2026-03-23 15:57:46 UTC
Red Hat Product Errata RHSA-2026:6008 0 None None None 2026-03-30 01:42:41 UTC
Red Hat Product Errata RHSA-2026:6253 0 None None None 2026-03-31 09:03:18 UTC
Red Hat Product Errata RHSA-2026:6464 0 None None None 2026-04-02 12:01:10 UTC

Description OSIDB Bzimport 2026-01-23 17:03:23 UTC 
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".
Comment 2 errata-xmlrpc 2026-02-05 15:34:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:2128 https://access.redhat.com/errata/RHSA-2026:2128
Comment 4 errata-xmlrpc 2026-03-10 09:27:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:4165 https://access.redhat.com/errata/RHSA-2026:4165
Comment 5 errata-xmlrpc 2026-03-10 09:51:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:4168 https://access.redhat.com/errata/RHSA-2026:4168
Comment 7 errata-xmlrpc 2026-03-10 22:28:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:4216 https://access.redhat.com/errata/RHSA-2026:4216
Comment 9 errata-xmlrpc 2026-03-12 12:28:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:4463 https://access.redhat.com/errata/RHSA-2026:4463
Comment 10 errata-xmlrpc 2026-03-12 13:30:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:4473 https://access.redhat.com/errata/RHSA-2026:4473
Comment 11 errata-xmlrpc 2026-03-17 10:33:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:4713 https://access.redhat.com/errata/RHSA-2026:4713
Comment 12 errata-xmlrpc 2026-03-17 11:04:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:4746 https://access.redhat.com/errata/RHSA-2026:4746
Comment 14 errata-xmlrpc 2026-03-19 17:53:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:5152 https://access.redhat.com/errata/RHSA-2026:5152
Comment 15 errata-xmlrpc 2026-03-23 01:30:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:5216 https://access.redhat.com/errata/RHSA-2026:5216
Comment 16 errata-xmlrpc 2026-03-23 01:38:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:5221 https://access.redhat.com/errata/RHSA-2026:5221
Comment 17 errata-xmlrpc 2026-03-23 02:13:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:5223 https://access.redhat.com/errata/RHSA-2026:5223
Comment 18 errata-xmlrpc 2026-03-23 02:14:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:5219 https://access.redhat.com/errata/RHSA-2026:5219
Comment 19 errata-xmlrpc 2026-03-23 02:29:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:5215 https://access.redhat.com/errata/RHSA-2026:5215
Comment 20 errata-xmlrpc 2026-03-23 02:33:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:5218 https://access.redhat.com/errata/RHSA-2026:5218
Comment 21 errata-xmlrpc 2026-03-23 02:36:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:5220 https://access.redhat.com/errata/RHSA-2026:5220
Comment 22 errata-xmlrpc 2026-03-23 03:23:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:5225 https://access.redhat.com/errata/RHSA-2026:5225
Comment 23 errata-xmlrpc 2026-03-23 03:46:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:5226 https://access.redhat.com/errata/RHSA-2026:5226
Comment 24 errata-xmlrpc 2026-03-23 05:20:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:5315 https://access.redhat.com/errata/RHSA-2026:5315
Comment 25 errata-xmlrpc 2026-03-23 15:57:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:5399 https://access.redhat.com/errata/RHSA-2026:5399
Comment 26 errata-xmlrpc 2026-03-30 01:42:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:6008 https://access.redhat.com/errata/RHSA-2026:6008
Comment 27 errata-xmlrpc 2026-03-31 09:03:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:6253 https://access.redhat.com/errata/RHSA-2026:6253
Comment 28 errata-xmlrpc 2026-04-02 12:01:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:6464 https://access.redhat.com/errata/RHSA-2026:6464
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