EUVD-2025-20759Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
8DescriptionCVE.org
A vulnerability, which was classified as problematic, was found in mruby up to 3.4.0-rc2. Affected is the function scope_new of the file mrbgems/mruby-compiler/core/codegen.c of the component nregs Handler. The manipulation leads to heap-based buffer overflow. An attack has to be approached locally. The exploit has been disclosed to the public and may be used. The name of the patch is 1fdd96104180cc0fb5d3cb086b05ab6458911bb9. It is recommended to apply a patch to fix this issue.
AnalysisAI
Local heap-based buffer overflow in mruby compiler (codegen.c) through version 3.4.0-rc2 allows low-privileged local attackers to cause denial of service. The flaw resides in the scope_new function where missing initialization of the nregs variable leads to heap corruption when processing a crafted Ruby script. Public exploit code is available, though no active exploitation in the wild has been confirmed.
heap-buffer-overflow in mrb_vm_exec in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Rated critical severit
Out-of-bounds Read in mrb_get_args in GitHub repository mruby/mruby prior to 3.2. Rated critical severity (CVSS 9.8), th
Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Rated critical severity (CVSS
Heap-based Buffer Overflow in Homebrew mruby prior to 3.2. Rated critical severity (CVSS 9.8), this vulnerability is rem
mruby is vulnerable to Heap-based Buffer Overflow. Rated critical severity (CVSS 9.8), this vulnerability is remotely ex
mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrec
In mruby 2.1.0, there is a use-after-free in hash_slice in mrbgems/mruby-hash-ext/src/hash-ext.c. Rated critical severit
In mruby 2.1.0, there is a stack-based buffer overflow in mrb_str_len_to_dbl in string.c. Rated critical severity (CVSS
In mruby 2.1.0, there is a use-after-free in hash_values_at in mrbgems/mruby-hash-ext/src/hash-ext.c. Rated critical sev
The init_copy function in kernel.c in mruby 1.4.1 makes initialize_copy calls for TT_ICLASS objects, which allows attack
In versions of mruby up to and including 1.4.0, an integer overflow exists in src/vm.c::mrb_vm_exec() when handling OP_G
use after free in mrb_vm_exec in GitHub repository mruby/mruby prior to 3.2. Rated critical severity (CVSS 9.1), this vu
Same weakness CWE-119 – Buffer Overflow
View allSame technique Buffer Overflow
View allVendor StatusVendor
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| xenial | needs-triage | - |
| bionic | needs-triage | - |
| focal | needs-triage | - |
| jammy | needs-triage | - |
| noble | needs-triage | - |
| upstream | needs-triage | - |
| oracular | ignored | end of life, was needs-triage |
| plucky | ignored | end of life, was needs-triage |
| questing | needs-triage | - |
Debian
Bug #1109338| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | vulnerable | 2.1.2-3 | - |
| bookworm | vulnerable | 3.1.0-3 | - |
| trixie | vulnerable | 3.3.0-1 | - |
| forky, sid | fixed | 3.4.0-2 | - |
| (unstable) | fixed | 3.4.0-2 | - |
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External POC / Exploit Code
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