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Medium, CVSS 6.9

Snappy : SSRF and local file read via the xsl-style-sheet option

CVE-2026-46683GHSA-c5fp-p67m-gq56

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (knplabs/knp-snappy 1.7.0), 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 4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:L/SA:N · score source
EPSS
  • CVE-2026-46683: 0.25% estimated exploitation activity in the next 30 days; percentile 16.29 (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 It impacts applications where: - the PHP daemon run with root permissions ; - the application is either running outside a container or has sensitive file access ; It could happens with this kind of workflows: Patches A list a schema with http and https by default is used to validate the remote path by default. Workarounds Developers should ensure usage cannot allow (in any case) a user to pass a free input directly to the Snappy library. Instead developers can list available available stylesheets and pick the right one with the user input. References Read more about SSRF at owasp.org/www-community/attacks/ServerSideRequestForgery

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

    Published from ghsa record GHSA-c5fp-p67m-gq56

Agent brief

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# Patch Next advisory brief: CVE-2026-46683

Advisory: Snappy : SSRF and local file read via the xsl-style-sheet option
IDs: CVE-2026-46683, GHSA-c5fp-p67m-gq56
Record: https://patchnext.com/advisories/cve-2026-46683 (revision 1, source checked 26 Oct 2026, 14:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: knplabs/knp-snappy 1.7.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist knplabs/knp-snappy: affected <= 1.6.0; fixed in 1.7.0

## Suggested inspection (read-only)
- Packagist knplabs/knp-snappy: 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 knplabs/knp-snappy.
- 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-c5fp-p67m-gq56 (GitHub-reviewed advisory GHSA-c5fp-p67m-gq56 lists affected ranges: Packagist knplabs/knp-snappy >=0 <=1.6.0)

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