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High, CVSS 8.2

HTTP header injection in Sonatype Nexus Repository

CVE-2021-40143GHSA-f34x-8pf6-qc9c

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.sonatype.nexus:nexus-repository 3.34.0-01), 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
8.2 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
EPSS
  • CVE-2021-40143: 2.32% estimated exploitation activity in the next 30 days; percentile 83.48 (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.

Sonatype Nexus Repository 3.x through 3.33.1-01 is vulnerable to an HTTP header injection. By sending a crafted HTTP request, a remote attacker may disclose sensitive information or request external resources from a vulnerable instance.

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

    Published from ghsa record GHSA-f34x-8pf6-qc9c

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-2021-40143

Advisory: HTTP header injection in Sonatype Nexus Repository
IDs: CVE-2021-40143, GHSA-f34x-8pf6-qc9c
Record: https://patchnext.com/advisories/cve-2021-40143 (revision 1, source checked 26 Oct 2026, 16:07 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.sonatype.nexus:nexus-repository 3.34.0-01. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.sonatype.nexus:nexus-repository: affected >= 3.0.0, <= 3.33.1-01; fixed in 3.34.0-01

## Suggested inspection (read-only)
- Maven org.sonatype.nexus:nexus-repository: 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 org.sonatype.nexus:nexus-repository.
- 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://github.com/advisories/GHSA-f34x-8pf6-qc9c (GitHub-reviewed advisory GHSA-f34x-8pf6-qc9c lists affected ranges: Maven org.sonatype.nexus:nexus-repository >=3.0.0 <=3.33.1-01)

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