---
id: "CVE-2026-21850"
page: "https://infrastack.ai/live/CVE-2026-21850"
kind: "vulnerability"
aliases: ["CVE-2026-21850"]
title: "HCL AION: user input in HTTP headers allows header injection and response splitting"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["hcl-aion", "vendor"]
not_affected_if: []
published_at: "2026-11-06T14:17:11+00:00"
first_seen_at: "2026-11-06T14:42:11+00:00"
updated_at: "2026-11-06T14:43:36+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21850", "first_seen_at": "2026-11-06T14:42:11+00:00"}]
exploit_sources: []
---

# HCL AION: user input in HTTP headers allows header injection and response splitting

Link for people: https://infrastack.ai/live/CVE-2026-21850 (this .md is for agents)

HCL AION includes user-controlled input in HTTP response headers without stripping CR/LF characters. An attacker can inject extra headers or split the response, which can lead to unintended behavior under certain conditions.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-11-06T14:42:11+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-21850

## From the sources

HCL AION is affected by a vulnerability where user-controlled input could be included in HTTP response headers without proper neutralization of CR/LF characters. This may allow an attacker to inject headers or split responses, potentially resulting in unintended behavior or security impact under certain conditions.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_