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CVE-2026-94440— Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart

Quick assessment

Affected
Go standard library net/textproto
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

解析多部分表单（multipart form）时，如果某个部分开始时剩余的内存限制不足 400 字节，可能会绕过内存限制，并将任意长度的行加载到内存中。

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-94440

Vulnerability Information
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Vulnerability Title
Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Go standard library net/textproto 0 ~ 1.26.9 -
Go standard library mime/multipart 0 ~ 1.26.9 -

II. Public POCs for CVE-2026-94440

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-94440

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Proof of Concept for CVE-2026-94440 (1)

Vendor Pages for CVE-2026-94440 (2)

Other References for CVE-2026-94440 (1)

Same Patch Batch · Go standard library · 2026-10-08 · 13 CVEs total

CVE-2026-94439 HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http
CVE-2026-94448 Reset context tracking on consecutive template expressions in html/template
CVE-2026-56857 Root.Mkdir(All) can follow junctions out of the root on Windows in os
CVE-2026-56866 HTTP/1 client connection desynchronization after CONNECT rejection in net/http
CVE-2026-78659 HTTP/2 server memory exhaustion due to Trailer headers in net/http
CVE-2026-78660 HTTP/2 transport accepts malformed framing-related headers in net/http
CVE-2026-78663 Double flow control refund on HTTP/2 server streams in net/http
CVE-2026-78667 Lack of limit on size of parsed Range headers in net/http
CVE-2026-78669 Excessive CPU consumption from repeated initial window changes in net/http
CVE-2026-97032 HTTP/2 server crash due to HPACK encoder race in net/http
CVE-2026-97030 Recognize yield as regexp preceder keyword in html/template
CVE-2026-97031 Reject malformed ECH outer extension references in crypto/tls

IV. Related Vulnerabilities

Same product: net/textproto
Same vendor: Go standard library

V. Comments for CVE-2026-94440

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