Security readout for executives and security teams
Plain-English summary
Narou/Narou.rb before 3.8.0 can treat a novel title or author name as Ruby code. If an organization uses this tool with untrusted novel metadata, an attacker-controlled title or author could affect the system running Narou.
Executive priority
Prioritize remediation where Narou processes untrusted content. The affected software appears niche, but code injection can be serious on exposed or automated processing systems.
Technical view
CVE-2021-35514 is a Ruby code injection issue in Narou/Narou.rb before 3.8.0. The reported injection vectors are the novel title name and author name. The supplied sources do not provide CVSS, CWE, exploit details, or affected CPE data.
Likely exposure
Exposure is likely limited to systems or developer workstations running Narou/Narou.rb before 3.8.0 and processing novel metadata from untrusted or externally supplied sources.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Public details identify the vulnerable input fields, but do not establish exploitation in the wild.
Researcher notes
The public record is sparse: no CVSS, CWE, CPE, or exploitation confirmation is provided in the bundle. Analysis should focus on version confirmation, metadata trust boundaries, and vendor changelog review.
Mitigation direction
- Upgrade Narou/Narou.rb to version 3.8.0 or later.
- Confirm all environments use the upgraded package version.
- Avoid processing untrusted novel metadata until upgraded.
- Check vendor advisories and changelog for any additional guidance.
Validation and detection
- Inventory systems, scripts, and workstations using Narou/Narou.rb.
- Check installed Narou/Narou.rb versions against the 3.8.0 fixed boundary.
- Review whether workflows ingest externally supplied novel titles or author names.
- Review logs around Narou processing for unexpected Ruby errors or abnormal behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-35514 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://vuln.ryotak.me/advisories/51CVE reference · x_refsource_MISC
- https://github.com/whiteleaf7/narou/blob/develop/ChangeLog.md#380-20210627CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.