HighVulnerabilityLLM-specific

CVE-2026-109440: LangAlpha indirect prompt injection through agent-retrieved web content

Source: NVD(opens in a new tab)
Identifier: CVE-2026-109440
Published: October 19, 2026
Record updated: October 20, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.

Summary

LangAlpha through 2026.09.07 contains an indirect prompt injection vulnerability. Remote attackers can plant instructions in web content the agent retrieves, causing it to run shell commands or Python. Because Bash and ExecuteCode have no allow-list or human-in-the-loop approval, the attacker can execute code in the workspace sandbox and exfiltrate vault secrets from _internal/.vault_secrets.json.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 8.1(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: required
EPSS: Not scored. FIRST had not published an EPSS score for this CVE when it was last checked on October 20, 2026.
Disclosure date: October 19, 2026

Weaknesses and techniques

AI threat technique (MITRE ATLAS): AML.T0051

Classification

Attack type: Prompt injection
Attack sophistication: Trivial
AI component targeted: Agent
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-109440

First tracked: October 20, 2026 at 02:13 AM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 95% (self-assessed)

Topics

Prompt injection and jailbreaks

Summary

Mitigation

Topics

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