High [CVE-2026-116273] Denial of Service via memory exhaustion from excessive message parts
This high-severity Red Hat Linux advisory covers CVE-2026-116273 affecting Red Hat Enterprise Linux 6, Red Hat package: perl-mime-tools.
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Summary
MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion. The max_parts option defaulted to -1, which disables the limit, so a parser created with default settings builds an entity for every part however many a message has.
Version 5.521 sets max_parts to 1000 and max_depth to 64 by default. Setting either to -1 still removes the limit.
A flaw was found in perl-mime-tools. The parser does not enforce a default limit on the number of parts processed in a MIME (Multipurpose Internet Mail Extensions) message.
A remote attacker could exploit this vulnerability by submitting a crafted message containing an excessive number of parts, leading to memory exhaustion and a Denial of Service (DoS). Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770. Affected Red Hat products: Red Hat Enterprise Linux 6.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: perl-mime-tools.
- < 5.521
Official advisory · high-confidence parse· fetched 8 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 8 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 8 hours ago·verify at source
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