AzuraCast Vulnerable to Liquidsoap Code Injection via Incomplete cleanUpString-to-toRawString Migration in Remote Relay Password Field

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Summary The cleanUpString() method in ConfigWriter.php uses an ungreedy regex to strip Liquidsoap string interpolation patterns (#{...}) from user input. This regex can be bypassed via nested interpolation syntax (#{#{EXPR}}), allowing injection of arbitrary Liquidsoap code. Commit ff49ef4 migrated most user-controlled fields to the safe toRawString() method but left the remote relay password field using the vulnerable cleanUpString(). A user with the RemoteRelays station permission can achieve arbitrary code execution in the Liquidsoap process, leak internal API keys, or disrupt station operation. Details The Vulnerable Sanitizer cleanUpString() at backend/src/Radio/Backend/Liquidsoap/ConfigWriter.php:1349-1367: The /U (ungreedy) flag causes . to match the minimum characters until the first }. With nested input #{#{EXPR}}: 1. Regex finds #{ at position 0 2. Ungreedy . matches #{EXPR (stops at the first }) 3. Full match consumed: #{#{EXPR} — replacement with capture group $1 yields:…

Published by the source

4 May 2026, 21:19 UTC

Last modified by the source

4 May 2026, 21:19 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-q4ph-8x8g-95f8

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# Patch Next advisory brief: GHSA-q4ph-8x8g-95f8

Advisory: AzuraCast Vulnerable to Liquidsoap Code Injection via Incomplete cleanUpString-to-toRawString Migration in Remote Relay Password Field
IDs: GHSA-q4ph-8x8g-95f8
Record: https://patchnext.com/advisories/ghsa-q4ph-8x8g-95f8 (revision 1, source checked 26 Oct 2026, 14:39 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: azuracast/azuracast 0.23.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist azuracast/azuracast: affected <= 0.23.5; fixed in 0.23.6

## Suggested inspection (read-only)
- Packagist azuracast/azuracast: 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 azuracast/azuracast.
- 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-q4ph-8x8g-95f8 (GitHub-reviewed advisory GHSA-q4ph-8x8g-95f8 lists affected ranges: Packagist azuracast/azuracast >=0 <=0.23.5)

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