Medium [CVE-2026-116272] Security filter bypass via nested comments in boundary parameters
This medium-severity Red Hat Linux advisory covers CVE-2026-116272 affecting Red Hat Enterprise Linux 6, Red Hat package: perl-mime-tools.
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Summary
MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter whose name contains a nested comment. A parameter written boundary((c))="A" or boundary(\))="A" is stored under that literal name rather than as boundary.
A second boundary parameter is then not reported as a duplicate, and MIME::Parser splits the message on it. Readers that skip comments as RFC 5322 allows take the first boundary instead.
A remote sender can hide an attachment from a filter that relies on ambiguous_content() while the recipient's mail client shows it. A flaw was found in perl-mime-tools.
A remote attacker can bypass email security filters by sending a specially crafted message containing duplicate Multipurpose Internet Mail Extensions (MIME) boundary parameters with nested comments.
Because the parser fails to properly normalize parameter names containing comments, it treats duplicate boundaries as separate entries rather than flagging them as duplicates. This parsing discrepancy allows an attacker to conceal malicious email attachments from security inspection tools while the recipient's email client displays them.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-115.
Affected Red Hat products: Red Hat Enterprise Linux 6. Will not fix / out of support: Red Hat Enterprise Linux 6.
- < 5.521
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
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