# CVE-2026-94440 — Go standard library net/textproto

> As of 2026-10-09, CVE-2026-94440 is a HIGH-severity vulnerability in Go standard library net/textproto, CVSS v3.1 7.5, EPSS 0.1% (7.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-94440 as of 2026-10-09; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-10-09

## What is CVE-2026-94440?

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.

The record classifies CVE-2026-94440 under weakness class [CWE-770](https://intel.threadlinqs.com/cwe/CWE-770). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 2 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 7.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-08, last modified 2026-10-09

## Is CVE-2026-94440 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Go standard library](https://intel.threadlinqs.com/vendors/go-standard-library): net/textproto, mime/multipart

## How to fix CVE-2026-94440

No vendor patch reference has been recorded for CVE-2026-94440 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-94440

No threat campaign in the Threadlinqs corpus currently references CVE-2026-94440, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [go.dev](https://go.dev/cl/847307)
- [go.dev (81741)](https://go.dev/issue/81741)
- [groups.google.com](https://groups.google.com/g/golang-announce/c/U2fTuyDJznI)
- [pkg.go.dev](https://pkg.go.dev/vuln/GO-2026-6608)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-94440
Full detection coverage and IOCs for threats exploiting CVE-2026-94440 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp