CVE-2026-1299
EUVD-2026-427223.01.2026, 17:16
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".
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| python | cpython | 𝑥 < 3.10.20 | CNA |
| python | cpython | 3.11.0 ≤ 𝑥 < 3.11.15 | CNA |
| python | cpython | 3.12.0 ≤ 𝑥 < 3.12.13 | CNA |
| python | cpython | 3.13.0 ≤ 𝑥 < 3.13.12 | CNA |
| python | cpython | 3.14.0 ≤ 𝑥 < 3.14.3 | CNA |
Debian Releases
Debian Product | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| pypy3 |
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| python3.11 |
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| python3.13 |
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| python3.14 |
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| python3.9 |
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Vulnerability Media Exposure
References