CVE-2025-60229 Security Alert: CRITICAL Vulnerability

Urgent: CVE-2025-60229 requires immediate attention.

· 7 min read

Executive Summary

CVE-2025-60229 is a critical deserialization flaw in Themeton Lagom that can lead to Object Injection when untrusted data is processed. With a CVSS of 9.8, this is the kind of issue that can turn a normal request into remote code execution, data theft, or full application compromise if the vulnerable path is reachable.

Although this issue is not currently listed in KEV and there is no confirmed exploitation in the wild, solo developers and small teams should treat it as an emergency. If your app uses Lagom anywhere in the request path, assume an attacker may be able to trigger it through crafted input.

Immediate Action

  • Patch or upgrade Lagom immediately to the first fixed release. If the vendor has not published a fixed version yet, remove or disable Lagom until one is available. Vendor advisory / release notes
  • Rollback to a known-safe build if you recently introduced Lagom and cannot confirm a fix. Prefer a rollback over leaving a critical deserialization bug exposed.
  • Isolate the service behind auth, IP allowlists, or a temporary maintenance page if the vulnerable endpoint is internet-facing.
  • Disable any feature that accepts serialized objects, session blobs, or plugin/theme payloads from users or third parties.
  • Rotate secrets if the service may have been exposed: API keys, session signing keys, database passwords, and deployment tokens.
  • Review logs for unusual requests, spikes in 500s, unexpected object-related errors, or suspicious serialized payloads.

Affected Versions

  • Lagom from n/a through 2.0 — vulnerable
  • Lagom 2.0 — vulnerable unless vendor confirms a patched build
  • Lagom <= 2.0 — treat as vulnerable until a fixed version is published
  • TODO fixed version — upgrade to the first vendor-released patched version as soon as available

Safe versions: none are confirmed in the provided advisory. Use TODO_FIXED_VERSION as a placeholder until the vendor publishes the exact patched release.

Resolution Guide

JavaScript (npm / yarn / pnpm)

# npm
npm ls lagom
npm i lagom@TODO_FIXED_VERSION

# yarn
yarn why lagom
yarn add lagom@TODO_FIXED_VERSION

# pnpm
pnpm why lagom
pnpm add lagom@TODO_FIXED_VERSION

Python (pip / pipx)

pip show lagom
pip install "lagom==TODO_FIXED_VERSION"

# If installed via pipx
pipx list
pipx upgrade lagom

Java (Maven / Gradle)

# Maven
mvn dependency:tree | grep -i lagom
# then update pom.xml to:
# <version>TODO_FIXED_VERSION</version>

# Gradle
./gradlew dependencies | grep -i lagom
# then update build.gradle:
# implementation "group:lagom:TODO_FIXED_VERSION"

Linux packages (apt / yum / dnf)

# Debian/Ubuntu
apt list --installed | grep -i lagom
sudo apt-get install --only-upgrade lagom=TODO_FIXED_VERSION

# RHEL/CentOS/Fedora
rpm -qa | grep -i lagom
sudo yum update lagom-TOODO_FIXED_VERSION
# or
sudo dnf upgrade lagom

Docker image tags

docker pull your-registry/lagom:TODO_FIXED_VERSION
# then update compose/k8s manifests to pin the fixed tag
image: your-registry/lagom:TODO_FIXED_VERSION

Config hardening

# Example: disable object deserialization paths
LAGOM_DISABLE_DESERIALIZATION=true

# Example: restrict risky endpoints
ALLOWED_SERIALIZATION_FORMATS=json

# Example: turn off plugin/theme upload processing
ENABLE_THEME_UPLOADS=false

Minimal code fix pattern

// BAD: deserializing untrusted input
const obj = deserialize(req.body.payload);

// BETTER: reject object payloads and use a safe format
if (typeof req.body.payload !== "string") {
  throw new Error("Invalid payload");
}
const data = JSON.parse(req.body.payload); // only if JSON schema is enforced

Detection & Verification

Check whether you are vulnerable:

# Find installed version
npm ls lagom
yarn why lagom
pnpm why lagom
pip show lagom
mvn dependency:tree | grep -i lagom
./gradlew dependencies | grep -i lagom
docker image ls | grep -i lagom
apt list --installed | grep -i lagom
rpm -qa | grep -i lagom

Search your codebase for risky deserialization:

grep -RniE "deserialize|unserialize|ObjectInputStream|pickle|yaml.load|gob|marshal" .
grep -RniE "payload|session|token|theme|plugin" .

Verify the fix:

# Re-run dependency checks after upgrade
npm ls lagom
pip show lagom
mvn dependency:tree | grep -i lagom

# Confirm the running container/image tag
docker inspect your-registry/lagom:TODO_FIXED_VERSION --format '{{.RepoTags}}'

# Smoke test the endpoint with a harmless malformed payload
curl -i https://your-app.example.com/endpoint -d 'payload=test'

Look for the patched version in your lockfile, package manifest, container tag, or OS package inventory. If the vendor publishes a checksum or advisory ID, record it in your incident notes and deployment history.

Risk and Impact

This flaw can let an attacker send crafted data that the application interprets as objects instead of plain input. In the worst case, that can lead to remote code execution, unauthorized file access, session forgery, or full takeover of the affected service.

The blast radius is especially high for small teams because one compromised app can expose credentials, databases, CI/CD tokens, and cloud metadata. If Lagom is used in a public-facing endpoint, treat the service as potentially compromised until patched and verified.

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