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High, CVSS 7.5amended

Regular Expression Denial of Service (ReDoS)

CVE-2021-27290GHSA-vx3p-948g-6vhq

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (node 12.22.2; ssri 8.0.1, 7.1.1, 6.0.2), 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

  • runtime node

    Affected
    >= 12.0.0, < 12.22.2
    Fixed in
    12.22.2

  • npm ssri

    Affected
    >= 5.2.2, < 6.0.2>= 7.0.0, < 7.1.1>= 8.0.0, <= 8.0.0
    Fixed in
    7.1.1, 8.0.1, 6.0.2

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-2021-27290: 4.72% estimated exploitation activity in the next 30 days; percentile 91.85 (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.

npm ssri 5.2.2-6.0.1 and 7.0.0-8.0.0, processes SRIs using a regular expression which is vulnerable to a denial of service. Malicious SRIs could take an extremely long time to process, leading to denial of service. This issue only affects consumers using the strict option.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from vendor_advisory record nodejs-security-wg:core:81

  2. Revision 2 · amended ·

    Amended from ghsa record GHSA-vx3p-948g-6vhq

  3. Revision 1 · created ·

    Published from osv record GHSA-vx3p-948g-6vhq

Agent brief

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# Patch Next advisory brief: CVE-2021-27290

Advisory: Regular Expression Denial of Service (ReDoS)
IDs: CVE-2021-27290, GHSA-vx3p-948g-6vhq
Record: https://patchnext.com/advisories/cve-2021-27290 (revision 3, source checked 26 Oct 2026, 16:35 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: node 12.22.2; ssri 8.0.1, 7.1.1, 6.0.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- runtime node: affected >= 12.0.0, < 12.22.2; fixed in 12.22.2
- npm ssri: affected >= 5.2.2, < 6.0.2; >= 7.0.0, < 7.1.1; >= 8.0.0, <= 8.0.0; fixed in 7.1.1, 8.0.1, 6.0.2

## Suggested inspection (read-only)
- runtime node: check the installed version with your package manager.
- `npm ls ssri --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 node, ssri.
- 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-vx3p-948g-6vhq (OSV record GHSA-vx3p-948g-6vhq lists affected ranges: npm ssri >=5.2.2 =7.0.0 =8.0.0 <8.0.1 (fixed))
- Verified: https://github.com/advisories/GHSA-vx3p-948g-6vhq (GitHub-reviewed advisory GHSA-vx3p-948g-6vhq lists affected ranges: npm ssri >=5.2.2 =7.0.0 =8.0.0 <=8.0.0)
- Verified: https://nodejs.org/dist/index.json (The nodejs.org release index dates the first patched release for CVE-2021-27290 to 2021-07-01.)
- Verified: https://raw.githubusercontent.com/nodejs/security-wg/main/vuln/core/81.json (Node.js security working group core entry 81 lists CVE-2021-27290 affecting node >=12.0.0 <12.22.2)

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