EUVD-2026-75871
GHSA-q9f2-rhj2-x3xg
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
A NULL pointer dereference vulnerability exists in the Prism parser component of mruby 4.0.0. An attacker can provide a specially crafted Ruby source file that triggers the parser to pass a NULL pointer to nonnull string handling functions, resulting in undefined behavior and application crash.
AnalysisAI
mruby 4.0.0's Prism-based compiler front end (mrbgems/mruby-compiler) passes NULL pointers returned by zero-length allocations into memcpy() and memcmp(), so parsing a crafted Ruby source file such as an operator assignment whose write name is exactly "=" (for example eval('[.m M:+=')) causes undefined behavior and a possible interpreter crash. The impact is availability-only: an attacker who can get the target to compile or eval untrusted mruby source can interrupt the hosting process. …
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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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