High severity · published Oct 8, 2026
CVE-2026-94440
Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
Parsing a multipart form can bypass memory limits and read an arbitrarily long line into memory when the remaining limit at the start of a part is less than 400 bytes.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MI
mime/multipart · Go standard library
before 1.26.9; 1.27.0-0 before 1.27.2 · source: vendor
NE
net/textproto · Go standard library
before 1.26.9; 1.27.0-0 before 1.27.2 · source: vendor