# CVE-2026-64940: Auth bypass in Tegalog -Fumy Otegaru Memo Logger-

> An attacker can bypass authentication to access the management console and perform administrative operations due to a permissive regular expression.

- **Severity:** High 8.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Aug 2026
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-m4x6-wx7h-hwvh

## What is CVE-2026-64940?

CVE-2026-64940 is a high-severity authentication bypass vulnerability in Nishishi Factory Tegalog -Fumy Otegaru Memo Logger-, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Tegalog -Fumy Otegaru Memo Logger- provided by Nishishi Factory contains a vulnerability due to a permissive regular expression, which may allow an attacker who can access the affected product to log in to the management console. As a result, the attacker may perform any operations available from the management console.

Weakness: CWE-625 (Permissive Regular Expression)

## Which versions are affected by CVE-2026-64940?


## How do I fix CVE-2026-64940?

No fix has been published for CVE-2026-64940 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-64940 being exploited?

There is no known exploitation of CVE-2026-64940 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-64940 and fix it if it is affected.

What it is: CVE-2026-64940 is a high-severity authentication bypass vulnerability in Nishishi Factory Tegalog -Fumy Otegaru Memo Logger-, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-64940 in the wild and no public exploit code.

Affected product: Nishishi Factory Tegalog -Fumy Otegaru Memo Logger-. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-64940/ (Markdown: https://insights.sbomify.com/CVE-2026-64940/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-64940
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64940
- OSV: https://osv.dev/vulnerability/CVE-2026-64940

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-64940/
Summaries are generated and may contain mistakes; the official description above is the record.