Security readout for executives and security teams
Plain-English summary
CVE-2018-10199 is a memory safety issue in mruby through version 1.4.0. If an attacker can make an affected system run Ruby code, they may be able to turn the flaw into arbitrary code execution. The public record does not provide CVSS scoring or evidence of active exploitation.
Executive priority
Prioritize if mruby is embedded in products that process untrusted scripts or plugin code. Otherwise, handle through dependency inventory and normal remediation tracking.
Technical view
The flaw is a use-after-free in src/io.c in File#initilialize_copy() as described by the CVE record. Affected scope is mruby versions up to and including 1.4.0. The cited sources point to an upstream GitHub issue and commit, but the provided bundle does not name a fixed release.
Likely exposure
Exposure is likely limited to software or devices embedding mruby 1.4.0 or earlier, especially where users, plugins, scripts, or templates can cause Ruby code execution.
Exploitation context
The source bundle states exploitation requires an attacker who can cause Ruby code to run. No KEV listing or cited source confirms active exploitation in the wild.
Researcher notes
The evidence supports affected versions and attack precondition, but lacks CVSS, CWE, exploit evidence, and fixed-release detail in the provided bundle. Avoid assuming internet-wide exposure without confirming mruby deployment context.
Mitigation direction
- Inventory applications, appliances, and embedded components that include mruby.
- Identify any mruby versions up to and including 1.4.0.
- Review upstream issue and commit for vendor-confirmed remediation direction.
- Upgrade or replace affected mruby components according to vendor guidance.
- Restrict untrusted Ruby code execution where mruby is embedded.
Validation and detection
- Check software bills of materials for mruby dependencies.
- Inspect embedded runtime versions in products that execute Ruby scripts.
- Review whether untrusted users can influence Ruby code execution.
- Confirm remediation against upstream or vendor guidance before closure.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-10199 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://github.com/mruby/mruby/commit/b51b21fc63c9805862322551387d9036f2b63433CVE reference · x_refsource_CONFIRM
- https://github.com/mruby/mruby/issues/4001CVE reference · x_refsource_CONFIRM
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.