What is the CVSS score of CVE-2026-27961?

CVE-2026-27961 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-27961?

Within 24 hours: Isolate affected Agenta instances from production networks and disable template evaluation features if operationally feasible. Within 7 days: Implement network segmentation, deploy WAF rules to block template injection payloads, and conduct urgent security assessment of logs for exploitation attempts. Within 30 days: Upgrade to Agenta 0.86.8 or later when patch is released, or evaluate alternative LLMOps platforms if upgrading is not viable.

Agenta CVE-2026-27961

HIGH

Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336)

2026-02-26 security-advisories@github.com

Code Injection AI / ML Agenta

8.8

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate to Agenta API server
Exploit

Submit malicious template to evaluator
Execution

Inject code in template rendering
Impact

Execute arbitrary code on server

Vulnerability Assessment

Weakness	CWE CWE-1336 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V1 - Encoding and Sanitization Template injection prevention
Exploitation Conditions	Authenticated user account on Agenta API server version prior to 0.86.8 with access to evaluator template submission functionality in self-hosted or managed platform deployments.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Authenticated attackers can execute arbitrary code on Agenta API servers through server-side template injection in the evaluator template rendering functionality, affecting self-hosted and managed platform deployments prior to version 0.86.8. The vulnerability requires valid credentials but allows complete compromise of the affected server with high confidentiality, integrity, and availability impact. Organizations running Agenta should upgrade to version 0.86.8 or later immediately.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 8.8

Agenta is an open-source LLMOps platform. A Server-Side Template Injection (SSTI) vulnerability exists in versions prior to 0.86.8 in Agenta's API server evaluator template rendering. [CVSS 8.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affected Packages

pypi agenta fix: 0.86.8

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in pypi

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Affects Agenta. Agenta is an open-source LLMOps platform. A Server-Side Template Injection (SSTI) vulnerability exists in versions prior to 0.86.8 in Agenta's API server evaluator template rendering. Although the vulnerable code lives in the SDK package, it is executed server-side within the API process when running evaluators. This does not affect standalone SDK usage — it only impacts self-hosted or managed Agenta platform deployments. Version 0.86.8 contains a fix for the issue.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionGitHub Advisory

Agenta is an open-source LLMOps platform. A Server-Side Template Injection (SSTI) vulnerability exists in versions prior to 0.86.8 in Agenta's API server evaluator template rendering. Although the vulnerable code lives in the SDK package, it is executed server-side within the API process when running evaluators. This does not affect standalone SDK usage - it only impacts self-hosted or managed Agenta platform deployments. Version 0.86.8 contains a fix for the issue.

Executive ViewAI

Why It Matters

A critical Server-Side Template Injection vulnerability in Agenta's API server (CVE-2026-27961, CVSS 8.8) allows attackers to execute arbitrary code on affected systems. Organizations running Agenta versions prior to 0.86.8 face immediate risk of data breach, system compromise, and operational disruption, with no vendor patch currently available.

Business Impact: High

Compensating Controls

Implement Web Application Firewall (WAF) rules blocking common SSTI payloads (e.g., {{, {%, jinja2 expressions); restrict API access via network segmentation and IP whitelisting; disable template rendering endpoints if not mission-critical; enforce strict input validation on all user-supplied template data; monitor API logs for suspicious template syntax; consider running Agenta in a containerized, isolated environment with minimal host privileges until patch is available.

Threat Intelligence Overview

EPSS Score

0.1%

Top 83% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.