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High, CVSS 7.2amended

@vue/server-renderer: XSS via missing CR in attribute-name blacklist

GHSA-g2v6-rqmx-r4w6

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@vue/server-renderer 3.6.0-rc.6, 3.5.42), 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
7.2 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Description @vue/server-renderer was investigated specifically because it's the one place in Vue where template rendering output becomes a real HTTP response body -- a genuine server-side trust boundary, unlike client-side rendering which only ever affects the same browser session that's already running the app's own JS. ssrRenderAttrs() (in packages/server-renderer/src/helpers/ssrRenderAttrs.ts) is what compiled SSR output calls for something like <div v-bind="userObject". It loops over the object's own keys and, for each one, renders it as an HTML attribute: The value always goes through escapeHtml() -- that part is correctly and consistently applied everywhere in this file. But the attribute name (attrKey) is only checked against a character blacklist, then spliced directly into the output with no escaping of its own: That blacklist covers: , /, =, ", apostrophe, tab (U+0009), line feed (U+000A), form feed (U+000C), and space (U+0020). It does not cover U+000D -- carriage return…

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

    Amended from ghsa record GHSA-g2v6-rqmx-r4w6

  2. Revision 2 · amended ·

    Amended from osv record GHSA-g2v6-rqmx-r4w6

  3. Revision 1 · created ·

    Published from ghsa record GHSA-g2v6-rqmx-r4w6

Agent brief

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# Patch Next advisory brief: GHSA-g2v6-rqmx-r4w6

Advisory: @vue/server-renderer: XSS via missing CR in attribute-name blacklist
IDs: GHSA-g2v6-rqmx-r4w6
Record: https://patchnext.com/advisories/ghsa-g2v6-rqmx-r4w6 (revision 3, source checked 26 Oct 2026, 13:06 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @vue/server-renderer 3.6.0-rc.6, 3.5.42. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @vue/server-renderer: affected < 3.5.42; >= 3.6.0-rc.0, < 3.6.0-rc.6; fixed in 3.6.0-rc.6, 3.5.42

## Suggested inspection (read-only)
- `npm ls @vue/server-renderer --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 @vue/server-renderer.
- 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-g2v6-rqmx-r4w6 (GitHub-reviewed advisory GHSA-g2v6-rqmx-r4w6 lists affected ranges: npm @vue/server-renderer >=0 =3.6.0-rc.0 <3.6.0-rc.6)
- Verified: https://osv.dev/vulnerability/GHSA-g2v6-rqmx-r4w6 (OSV record GHSA-g2v6-rqmx-r4w6 lists affected ranges: npm @vue/server-renderer >=0 =3.6.0-rc.0 <3.6.0-rc.6 (fixed))

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