EUVD-2026-41977
GHSA-ff2c-rpvx-jp6m
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Trigger needs an attacker-supplied script executed by the VM, which is local input rather than a network service, so AV:L; no auth modeled (PR:N) and only the process crashes (A:H, C/I:N).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
mrubyc through 3.4.1 was found to contain a NULL pointer dereference in src/vm.c in op_super() / OP_SUPER due to a missing runtime guard for top-level super.
AnalysisAI
Denial of service in the mruby/c lightweight Ruby VM (all releases through 3.4.1) arises from a NULL pointer dereference in op_super()/OP_SUPER within src/vm.c, where a runtime guard for a top-level 'super' call is missing. When the interpreter executes a script that invokes 'super' outside of any method context, the VM dereferences a NULL pointer and crashes. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ability to get the mruby/c VM to execute a crafted script that invokes 'super' from top-level (module/main) scope where no enclosing method frame exists - that specific construct IS the trigger condition. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, 7.5) treats this as a remotely reachable, unauthenticated, low-complexity availability issue, but that network vector is only realistic if the target application feeds attacker-controlled Ruby scripts into the VM; in typical embedded deployments the bytecode is trusted and compiled in, which materially lowers real-world exposure - this is the key signal to weigh. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can supply a Ruby script to an mruby/c-based application submits a program that calls 'super' at the top level; the OP_SUPER handler dereferences a NULL pointer and the interpreter process crashes, denying service to the device or embedded application. Given AC:L this requires no special timing or conditions, but it hinges on the application accepting attacker-controlled scripts; no public proof-of-concept is currently identified. |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed - a candidate fix commit is published at https://github.com/hayat01sh1da/mrubyc/commit/c4aa2a06bfdd13a0f1ae5165c5760a2530314a42 (a contributor fork), which adds the missing runtime guard so top-level 'super' is rejected instead of dereferencing NULL; track upstream integration and release via issue https://github.com/mrubyc/mrubyc/issues/276. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit production systems to identify where mruby/c 3.4.1 or earlier is deployed and whether user-supplied or untrusted scripts are executed on it. …
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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