CVE-2026-92597

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{"bugzilla": {"description": "nodemailer: Nodemailer: Email domain validation bypass via RFC 5322 comment mis-parsing", "id": "2537871", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2537871"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "status": "draft"}, "cwe": "CWE-1286", "details": ["Nodemailer versions >= 6.9.16 and < 9.1.0 mis-parse RFC 5322 comments in email addresses: in lib/addressparser, a comment closed immediately before a non-break character causes the tokenizer to concatenate the atoms surrounding the comment instead of treating the comment as folding whitespace that terminates the domain. A recipient address such as user@good-corp.com(x)evil.com is therefore read by Nodemailer as the single domain good-corp.comevil.com (registrable domain comevil.com, which an attacker can register) and used for both the SMTP envelope (RCPT TO) and the emitted To:/From: headers, while a conformant RFC 5322 parser terminates the domain at the comment and reads good-corp.com. An application that validates the recipient domain with a strict RFC 5322 parser (without inspecting parse defects) or a naive prefix/substring allow-list and then hands the raw address to Nodemailer can be induced to deliver mail to a domain the attacker controls. Fixed in 9.1.0.", "A flaw was found in Nodemailer. This vulnerability allows a remote attacker to bypass email domain validation due to incorrect parsing of RFC 5322 comments in email addresses. Specifically, a malformed comment can cause Nodemailer to misinterpret the recipient's domain, leading to the delivery of emails to an attacker-controlled domain. This could result in unintended information disclosure or other security impacts."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-92597", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Not affected", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana12.4", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.1", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.2", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/bootc-automation-portal-rhel9", "product_name": "Self-service automation portal 2"}], "public_date": "2026-09-16T21:47:01Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-92597\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-92597\nhttps://github.com/nodemailer/nodemailer/commit/902b63e\nhttps://github.com/nodemailer/nodemailer/security/advisories/GHSA-cc9r-2j5m-2m83\nhttps://www.vulncheck.com/advisories/nodemailer-before-9.1.0-email-domain-validation-bypass-via-rfc-5322-comment"], "statement": "Moderate: This flaw in Nodemailer's email address parser can lead to a domain validation bypass. Applications within Red Hat products that utilize Nodemailer for email handling and perform domain validation using a strict RFC 5322 parser without inspecting parse defects, or a naive prefix/substring allow-list, could be induced to deliver emails to an attacker-controlled domain. Exploitation relies on a discrepancy between the application's validation and Nodemailer's parsing of RFC 5322 comments.", "threat_severity": "Moderate"}

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