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CVE-2026-1299

email BytesGenerator header injection due to unquoted newlines

Published: Jan 23, 2026Updated: Feb 13, 2026 Sources: CVE List NVD BDUCWE-93
NVD MITRE
7.1CVSSHIGH
EPSS Score
0.6%
Top 57.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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".

CVSS Vector Breakdown

AV:NAC:LC:LI:HA:N
Exploitability
AV:NAccess Vector
Network
AC:LAccess Complexity
Low
Impact
C:LConfidentiality
L
I:HIntegrity
H
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-93

Affected Products

Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Astra Linux Special EditionООО «РусБИТех-Астра»
On-premOS
Operating Systems / linux-distro
OpenShift Dev SpacesRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / container-orchestration
OpenShift AIRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / saas-application
red hat inc.commercialUSOperating Systemsaka red hat
ооо «ред софт»commercialRUOperating Systemsaka red soft
ооо «русбитех-астра»commercialRUOperating Systemsaka rusbitech-astra
and 6 more affected products View all →

Exploitability

Official Patch Available

References

https://cve.org/CVERecord?id=CVE-2024-6923
cve.org
https://github.com/python/cpython/commit/052e55e7d44718fe46cbba0ca995cb8fcc359413
github.com
https://github.com/python/cpython/commit/0a925ab591c45d6638f37b5e57796f36fa0e56d8
github.com
and 12 more references View all →

Timeline

Published
Jan 23, 2026
Last Updated
Feb 13, 2026

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