CVE-2026-56099

MEDIUM EPSS 33.9%
Published Jun 18, 20261w ago · Modified Jun 23, 20261w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Jun 18, 2026 1w ago
Last Modified Jun 23, 2026 1w ago

Description

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.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
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/E:X/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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
33.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

References 5

  • seclists.org http://seclists.org/fulldisclosure/2026/Jun/17
  • openwall.com http://www.openwall.com/lists/oss-security/2026/06/19/3
  • github.com https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd
  • pop.argus-systems.ai https://pop.argus-systems.ai/advisory/adv-040.html
  • vulncheck.com https://www.vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-input

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.