MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter whose name contains a nested comment
Impact
MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter with a nested comment, potentially hiding attachments from filters. A remote sender can exploit this. The impact depends on the recipient's mail client.
Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.What to do
Upgrade to MIME-tools 5.521 or later.
Affected packages
Affected products
Vendor version evidence. Product records are separate from automatic dependency matching.
Vendor not supplied · CPANSec
MIME-tools
1 range
Vendor not supplied · CPANSec
MIME-tools
Package identity
pkg:cpan/MIME-toolsIdentity supplied by CPANSec. Version matching requires compatible range evidence.
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affected
0 → before 5.521
custom versions
Other versions: unaffected
Original source description
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.
Inside the record
Evidence available
Describes the evidence in this view, not whether the product is safe.
Original records
CVE-2026-116272View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.
cve.new JSON →Underlying weaknesses
The source’s classification of what caused the vulnerability.
Contributing organizations · 1
Assigning organization
What changed
Follow changesLarge field values are marked as truncated previews. Original source snapshots remain retained.