DEBIAN-CVE-2026-1299

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-1299
Published: 23 Jan 2026, 17:16
Last modified:15 Jun 2026, 19:06

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
6 MEDIUM
4.0 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Jan 2026, 17:16
Published
Vulnerability first disclosed
15 Jun 2026, 19:06
Last Modified
Vulnerability information updated

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 Metrics

  • v4.0•MEDIUM•Score: 6CVSS: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 Systems

  • debian•pypy3

    all | all | all | all | < 7.3.21+dfsg-1

  • debian•python3.11

    all | < 3.11.2-6+deb12u7

  • debian•python3.13

    all | all | < 3.13.5-2+deb13u1 | < 3.13.12-1

  • debian•python3.14

    all | < 3.14.3-1

  • debian•python3.9

    < 3.9.2-1+deb11u5

References (1)