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NVD Vulnerability Details :
CVE-2026-1299
Awaiting Analysis
More InfoOfficial Page
Source-cna@python.org
View Known Exploited Vulnerability (KEV) details
Published At-23 Jan, 2026 | 17:16
Updated At-13 Feb, 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".

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.0MEDIUM
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
Type: Secondary
Version: 4.0
Base score: 6.0
Base severity: MEDIUM
Vector:
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
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-93Secondarycna@python.org
CWE ID: CWE-93
Type: Secondary
Source: cna@python.org
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://cve.org/CVERecord?id=CVE-2024-6923cna@python.org
N/A
https://github.com/python/cpython/commit/052e55e7d44718fe46cbba0ca995cb8fcc359413cna@python.org
N/A
https://github.com/python/cpython/commit/0a925ab591c45d6638f37b5e57796f36fa0e56d8cna@python.org
N/A
https://github.com/python/cpython/commit/7877fe424415bc4a13045e62a90a7277413d8cb9cna@python.org
N/A
https://github.com/python/cpython/commit/842ce19a0c0b58d61591e8f6a708c38db1fb94e4cna@python.org
N/A
https://github.com/python/cpython/commit/8cdf6204f4ae821f32993f8fc6bad0d318f95f36cna@python.org
N/A
https://github.com/python/cpython/commit/e417f05ad77a4c30ddc07f99e90fc0cef43e831acna@python.org
N/A
https://github.com/python/cpython/issues/144125cna@python.org
N/A
https://github.com/python/cpython/pull/144126cna@python.org
N/A
https://mail.python.org/archives/list/security-announce@python.org/thread/6ZZULGALJTITEAGEXLDJE2C6FORDXPBT/cna@python.org
N/A
Hyperlink: https://cve.org/CVERecord?id=CVE-2024-6923
Source: cna@python.org
Resource: N/A
Hyperlink: https://github.com/python/cpython/commit/052e55e7d44718fe46cbba0ca995cb8fcc359413
Source: cna@python.org
Resource: N/A
Hyperlink: https://github.com/python/cpython/commit/0a925ab591c45d6638f37b5e57796f36fa0e56d8
Source: cna@python.org
Resource: N/A
Hyperlink: https://github.com/python/cpython/commit/7877fe424415bc4a13045e62a90a7277413d8cb9
Source: cna@python.org
Resource: N/A
Hyperlink: https://github.com/python/cpython/commit/842ce19a0c0b58d61591e8f6a708c38db1fb94e4
Source: cna@python.org
Resource: N/A
Hyperlink: https://github.com/python/cpython/commit/8cdf6204f4ae821f32993f8fc6bad0d318f95f36
Source: cna@python.org
Resource: N/A
Hyperlink: https://github.com/python/cpython/commit/e417f05ad77a4c30ddc07f99e90fc0cef43e831a
Source: cna@python.org
Resource: N/A
Hyperlink: https://github.com/python/cpython/issues/144125
Source: cna@python.org
Resource: N/A
Hyperlink: https://github.com/python/cpython/pull/144126
Source: cna@python.org
Resource: N/A
Hyperlink: https://mail.python.org/archives/list/security-announce@python.org/thread/6ZZULGALJTITEAGEXLDJE2C6FORDXPBT/
Source: cna@python.org
Resource: N/A
Change History
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