Description
postal-mime before 4.2.1 contains a parser differential vulnerability in its address parser that truncates the domain at folding whitespace or comments preceding a dot. Remote attackers can craft From headers that pass SPF/DKIM/DMARC alignment for their own subdomain while PostalMime.parse() reports a spoofed victim sender address.
Published: 2026-11-10
Score: 8.2 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 10 Nov 2026 15:30:00 +0000

Type Values Removed Values Added
Description postal-mime before 4.2.1 contains a parser differential vulnerability in its address parser that truncates the domain at folding whitespace or comments preceding a dot. Remote attackers can craft From headers that pass SPF/DKIM/DMARC alignment for their own subdomain while PostalMime.parse() reports a spoofed victim sender address.
Title postal-mime before 4.2.1 Sender Spoofing via Address Parser Domain Truncation
Weaknesses CWE-436
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-10T15:22:50.822Z

Reserved: 2026-11-10T12:36:09.511Z

Link: CVE-2026-125756

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-10T16:17:22.937

Modified: 2026-11-10T16:17:22.937

Link: CVE-2026-125756

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses