Tegalog -Fumy Otegaru Memo Logger-: Permissive Regular Expression
CVE-2026-64940 is a high-severity permissive regular expression vulnerability in Tegalog -Fumy Otegaru Memo Logger- from Nishishi Factory, with a CVSS 3.1 base score of 8.6 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Tegalog -Fumy Otegaru Memo Logger- versions: 4.8.4 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.4% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Tegalog -Fumy Otegaru Memo Logger- you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Nishishi Factory | Tegalog -Fumy Otegaru Memo Logger- | 4.8.4 and earlier | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- LowSome restricted data can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- LowPerformance or availability is reduced.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L. Scored by CNA (jpcert.or.jp).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.8 | High | CNA (jpcert.or.jp) |
| CVSS 3.1 | 8.6 | High | CNA (jpcert.or.jp) |
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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Permissive Regular Expression
The product uses a regular expression that does not sufficiently restrict the set of allowed values.
How developers prevent this class of flaw
- When applicable, ensure that the regular expression marks beginning and ending string patterns, such as /^string$/ for Perl.
More Permissive Regular Expression vulnerabilities (CWE-625)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Recent Permissive Regular Expression vulnerabilities
- 7.5 High severity
- 9.8 Critical severity
Spotted an error? Tell us.