CVE-2026-45758 — guardrails-ai
CRITICALCVE-2026-45758 is a critical-severity (CVSS 9.6) CWE-506 vulnerability in guardrails-ai. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Malicious code in guardrails-ai 0.10.1 (supply chain compromise)
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-45758.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
guardrails-aiReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
On May 11, 2026 at approximately 6:00 PM Pacific, an attacker published a malicious version of guardrails-ai (0.10.1) to PyPI.
Affected: any user who installed guardrails-ai==0.10.1 from PyPI on May 11, 2026.
Security researchers identified the malicious package within approximately 2 hours of publication, and PyPI quarantined the repository. Based on our telemetry, we have observed no requests to Guardrails AI infrastructure originating from the malicious 0.10.1 version, and a review of system and access logs has produced no evidence of user data exfiltration through our systems.
For the full timeline, technical details, and remediation steps we have taken, see SECURITY_ADVISORY.md.
Patches
No patched version above 0.10.1 is available yet. Downgrade to 0.10.0, which is unaffected.
Workarounds
1. Pin to a safe version:
guardrails-ai==0.10.0
2. While the PyPI quarantine is active, install from GitHub:
pip install git+https://github.com/guardrails-ai/[email protected]
The v0.10.0 tag in this repository is clean. Track quarantine status here: #1473.
3. If you installed 0.10.1, treat the host as potentially compromised. Rotate any credentials accessible from that machine (GitHub PATs, cloud provider keys, package registry tokens, API keys) and audit your GitHub account for unauthorized workflows or repositories.
4. Snowglobe and Guardrails Hub users : all Snowglobe and Guardrails Hub API keys will be invalidated at 2:00 PM Pacific on May 13, 2026. Rotate yours before then to avoid service interruption.
References
- Full advisory, timeline, and remediation details: SECURITY_ADVISORY.md
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | guardrails-ai | all versions | No fix |
Affected Products
guardrails aiguardrailsaiDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for guardrails-ai, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of guardrails-ai for CVE-2026-45758. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is CVE-2026-45758 in your dependencies?
Find it across PyPI, including transitive dependencies.