Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-1299

Severity CVSS v4.0:
MEDIUM
Type:
CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
Publication date:
23/01/2026
Last modified:
26/01/2026

Description

The <br /> email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when <br /> serializing an email message allowing for header injection when an email<br /> is serialized. This is only applicable if using "LiteralHeader" writing headers that don&amp;#39;t respect email folding rules, the new behavior will reject the incorrectly folded headers in "BytesGenerator".

Impact

Vector 4.0
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 CVSS v4.0 Severity and Metrics:

Base Score: 6.00 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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): Present
Privileges Required (PR): Low
User Interaction (UI): None
Confidentiality (VC): Low
Integrity (VI): High
Availability (VA): None
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
6.00
Severity 4.0
MEDIUM

References to Advisories, Solutions, and Tools