CVE-2026-56099CWE-125

OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input

Medium · published June 18, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
42.0
In the wild
Unconfirmed
What it is

OpenBSD before commit 6a23123 (2026-06-18) contains an out-of-bounds read vulnerability in the mpls_do_error function within sys/netmpls/mpls_input.c that allows remote attackers to disclose kernel stack memory by sending crafted MPLS frames with 16 labels and no Bottom-of-Stack bit set.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00500 · 42.0th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-06-18T19:29Z
EPSS history
Timeline
  • 18 JUN 19:29Z
    OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input
    cvelistv5