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High, CVSS 7.5amended

Nest Affected by DoS via Recursive handleData in JsonSocket (TCP Transport)

CVE-2026-40879GHSA-hpwf-8g29-85qm

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@nestjs/microservices 11.1.19), 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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-40879: 0.33% estimated exploitation activity in the next 30 days; percentile 26.09 (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.

Impact Attacker sends many small, valid JSON messages in one TCP frame → handleData() recurses once per message; buffer shrinks each call → maxBufferSize is never reached; call stack overflows instead → A ~47 KB payload is sufficient to trigger RangeError Patches Fixed in @nestjs/microservices@11.1.19 References Discovered by https://github.com/hwpark6804-gif

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-hpwf-8g29-85qm

  2. Revision 1 · created ·

    Published from osv record GHSA-hpwf-8g29-85qm

Agent brief

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# Patch Next advisory brief: CVE-2026-40879

Advisory: Nest Affected by DoS via Recursive handleData in JsonSocket (TCP Transport)
IDs: CVE-2026-40879, GHSA-hpwf-8g29-85qm
Record: https://patchnext.com/advisories/cve-2026-40879 (revision 2, source checked 26 Oct 2026, 12:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @nestjs/microservices 11.1.19. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @nestjs/microservices: affected <= 11.1.18; fixed in 11.1.19

## Suggested inspection (read-only)
- `npm ls @nestjs/microservices --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## 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 @nestjs/microservices.
- 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/GHSA-hpwf-8g29-85qm (OSV record GHSA-hpwf-8g29-85qm lists affected ranges: npm @nestjs/microservices >=0 <11.1.19 (fixed))
- Verified: https://github.com/advisories/GHSA-hpwf-8g29-85qm (GitHub-reviewed advisory GHSA-hpwf-8g29-85qm lists affected ranges: npm @nestjs/microservices >=0 <=11.1.18)

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