CVE-2025-69256: The Serverless Framework is a framework for using AWS Lambda and other managed cloud services to build applica

This month

HIGH 7.5WATCHLISTUPGRADE

CVE-2025-69256 is a high-severity flaw (CVSS 7.5) affecting serverless. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Serverless Framework is a framework for using AWS Lambda and other managed cloud services to build applications. Starting in version 4.29.0 and prior to version 4.29.3, a command injection vulnerability exists in the Serverless Framework's built-in MCP server package (@serverless/mcp). This vulnerability only affects users of the experimental MCP server feature (serverless mcp), which represents less than 0.1% of Serverless Framework users. T

Why this priority

High severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-77
Published	2025-12-30
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: serverless

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-30 19:15 UTCPublished CVE record published
2026-06-17 10:00 UTCUpdated Record last modified

serverless serverless UPGRADE

Affected: >= 4.29.0 and < 4.29.3

Fixed in: 4.29.3

Safe to downgrade to: a release before 4.29.0

1. Check installed version

apt-cache policy serverless || rpm -q serverless || serverless --version

2. UPGRADE to 4.29.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade serverless

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade serverless

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.29.0 (Debian / Ubuntu)

apt-cache madison serverless sudo apt install serverless=<VERSION_BEFORE_4.29.0> sudo apt-mark hold serverless

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list serverless sudo dnf downgrade serverless-<VERSION_BEFORE_4.29.0> sudo dnf versionlock add serverless

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

npm · serverless · FIXED · 4.29.3 · vulnerable: >= 4.29.0, < 4.29.3 · source

npm install serverless@">=4.29.3" npm ls serverless

Fedora 46 · conan · FIXED · 2.31.0-1.fc46 · FEDORA-2026-ba58084ab5 · source

sudo dnf upgrade --advisory=FEDORA-2026-ba58084ab5

Fedora ELN · tesseract · FIXED · 5.5.4-1.eln159 · FEDORA-2026-866cf60ee6 · source

sudo dnf upgrade --advisory=FEDORA-2026-866cf60ee6

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: SimoesCTT/CTT-Serverless-RCE-v1.0---Convergent-Time-Theory-Enhanced-MCP-Exploit (0 stars)
GitHub PoC: studiomeyer-io/mcp-server-attestation (0 stars)
GitHub PoC: studiomeyer-io/mcp-stdio-shellguard (0 stars)
Write-up: github.com/serverless/serverless/security/advisories/GHSA-rwc2-f344-q6w6

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-69256?

serverless: upgrade to 4.29.3. Exact commands for each OS are on this page.

Is CVE-2025-69256 being exploited?

CVE-2025-69256 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-69256 affect?

CVE-2025-69256 affects serverless. Severity is high (CVSS 7.5). The Serverless Framework is a framework for using AWS Lambda and other managed cloud services to build applications. Starting in version 4.29.0 and prior to version 4.29.3, a command injection vulnerability exists in the Serverless Framewor

How urgent is CVE-2025-69256?

Priority 57/100. High severity; Public exploit reference; On your watchlist

Software pages

AWS vulnerabilities

References

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