Security readout for executives and security teams
Plain-English summary
CVE-2017-9527 is a memory-safety flaw in mruby through 1.2.0. A crafted Ruby file can crash an application using the vulnerable interpreter. Business urgency depends on whether mruby processes untrusted Ruby input; the source bundle does not show active exploitation.
Executive priority
Treat as a targeted availability risk unless mruby handles untrusted Ruby files. Prioritize internet-facing, multi-tenant, or automation systems where a crash could interrupt service.
Technical view
The issue is in mruby's mark_context_stack function in gc.c. The CVE describes heap-based use-after-free leading to denial of service and possibly unspecified other impact when handling a crafted .rb file. An upstream commit and Debian LTS advisory are referenced as remediation evidence.
Likely exposure
Exposure is most likely where mruby through 1.2.0 is embedded or packaged and can process attacker-supplied .rb files. Systems using distribution packages may depend on vendor backports rather than upstream version numbers.
Exploitation context
The provided sources describe crafted-file triggering and application crash impact. CISA KEV status is false, and the bundle provides no cited evidence of active exploitation in the wild.
Researcher notes
Evidence is limited to the CVE description, GitHub issue, upstream commit, and Debian advisory. No CVSS, CWE, precise fixed upstream release, or confirmed exploitation evidence is provided in the bundle.
Mitigation direction
- Inventory applications and appliances that embed or package mruby.
- Upgrade mruby or vendor packages using upstream or distribution security guidance.
- For Debian LTS systems, apply the referenced mruby security update.
- Restrict untrusted .rb file processing until remediation is confirmed.
- Monitor application crash logs for mruby-related failures.
Validation and detection
- Confirm whether deployed mruby is through version 1.2.0.
- Check package changelogs for the referenced upstream commit or Debian fix.
- Verify no exposed workflow accepts untrusted Ruby files into mruby.
- Review crash telemetry for mruby garbage-collector failures.
- Document any vendor backport evidence for exception handling.
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-2017-9527 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/issues/3486CVE reference · x_refsource_CONFIRM
- https://github.com/mruby/mruby/commit/5c114c91d4ff31859fcd84cf8bf349b737b90d99CVE reference · x_refsource_CONFIRM
- [debian-lts-announce] 20220506 [SECURITY] [DLA 2996-1] mruby security updateCVE reference · mailing-list, x_refsource_MLIST
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.