CVE-2020-15866: mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrect VM stack handling. It can be…

PriorityP347critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

2.07%

79.2th percentile

mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrect VM stack handling. It can be triggered via the stack_copy function.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	mruby	< mruby 2.1.2-1 (bookworm)	mruby 2.1.2-1 (bookworm)
mruby	mruby	<= 2.1.1	—
mruby	mruby	—	—
mruby	mruby	>= 0 < 2.1.2-1	2.1.2-1
mruby	mruby	>= 0 < 2.1.2-1	2.1.2-1
mruby	mruby	>= 0 < 2.1.2-1	2.1.2-1
mruby	mruby	>= 0 < 2.1.2-1	2.1.2-1

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvdv2.07.5HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P

osv9.8CRITICAL

vendor_debian9.8CRITICAL

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.