CVE-2018-12248
CVE-2018-12248 is a high-severity vulnerability in Mruby with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 2% (72nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Mruby
- Published:
- Last modified:
Description
An issue was discovered in mruby 1.4.1. There is a heap-based buffer over-read associated with OP_ENTER because mrbgems/mruby-fiber/src/fiber.c does not extend the stack in cases of many arguments to fiber.
Frequently asked questions
- What is CVE-2018-12248?
- An issue was discovered in mruby 1.4.1. There is a heap-based buffer over-read associated with OP_ENTER because mrbgems/mruby-fiber/src/fiber.c does not extend the stack in cases of many arguments to fiber.
- How severe is CVE-2018-12248?
- CVE-2018-12248 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2018-12248 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2018-12248?
- CVE-2018-12248 affects Mruby. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2018-12248?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2018-12248 published?
- CVE-2018-12248 was published on 2018-06-12 and last updated on 2026-06-17.
References
- https://github.com/mruby/mruby/commit/778500563a9f7ceba996937dc886bd8cde29b42b
- https://github.com/mruby/mruby/issues/4038
Affected products (1)
- cpe:2.3:a:mruby:mruby:1.4.1:*:*:*:*:*:*:*
More vulnerabilities in Mruby
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- CVE-2022-0570 — Critical (CVSS 9.8): Heap-based Buffer Overflow in Homebrew mruby prior to 3.2.
- CVE-2022-0080 — Critical (CVSS 9.8): mruby is vulnerable to Heap-based Buffer Overflow
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