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Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart

CVE-2026-94440

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (stdlib 1.27.2, 1.26.9), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go stdlib

    Affected
    < 1.26.9>= 1.27.0-0, < 1.27.2
    Fixed in
    1.26.9, 1.27.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
  • CVE-2026-94440: 0.51% estimated exploitation activity in the next 30 days; percentile 43.66 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from osv record GO-2026-6608

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-94440

Advisory: Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart
IDs: CVE-2026-94440
Record: https://patchnext.com/advisories/cve-2026-94440 (revision 1, source checked 23 Oct 2026, 22:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: stdlib 1.27.2, 1.26.9. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go stdlib: affected < 1.26.9; >= 1.27.0-0, < 1.27.2; fixed in 1.26.9, 1.27.2

## Suggested inspection (read-only)
- Go stdlib: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on stdlib.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GO-2026-6608 (OSV record GO-2026-6608 lists affected ranges: Go stdlib >=0 =1.27.0-0 <1.27.2 (fixed))

Commands are suggestions: review each one before running it.

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