CVE-2018-12247
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related...
CVE-2018-12247 is a high vulnerability (CVSS 7.5) in Mruby, published June 12, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.49%, the 74th percentile. No source names a fixed version.
- Severity
- 7.5 HighCVSS 3.0, NVD
- Exploit chance
- 1.49%EPSS, 74th percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
- No fix listedNo source names one
Description
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mrubyUbuntu:16.04:LTS | All versions, plus listed versions 1.1.0+20150817+gita1731254-11.1.0+20150906+git1cbbb7e1-11.2.0+20160315+git4f20d58a-1 | None known |
mrubyUbuntu:18.04:LTS | All versions, plus listed versions 1.3.0-11.3.0+20170925+git38185028-11.3.0+20171029+git77edafb0-11.4.0-1 | None known |
mrubyUbuntu:20.04:LTS | All versions, plus listed versions 2.0.0-1 | None known |
mrubyUbuntu:22.04:LTS | All versions, plus listed versions 2.1.2-33.0.0-13.0.0-3 | None known |
mrubyUbuntu:24.04:LTS | All versions, plus listed versions 3.2.0-13.2.0-2 | None known |
mrubyUbuntu:25.10 | All versions, plus listed versions 3.3.0-1 | None known |
mrubyUbuntu:26.10 | All versions, plus listed versions 3.4.0-23.4.0-34.0.0-1 | None known |
mrubyUbuntu:26.04:LTS | All versions, plus listed versions 3.3.0-13.4.0-2 | None known |
What each source reports
NVD Score used
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).
- Record
CVE-2018-12247- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-476
- Updated
- 2026-11-02
CVE ListNo score
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).
- Record
CVE-2018-12247- Updated
- 2026-11-02
EUVDEUVD-2018-4225No score
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).
- Record
EUVD-2018-4225- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8j6c-c99j-fh4c
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related...
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).
- Record
GHSA-8j6c-c99j-fh4c- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-476
- Updated
- 2026-11-02
OSV
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).
- Record
CVE-2018-12247- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-12247
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).
- Record
UBUNTU-CVE-2018-12247- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.