Vulnerabilities CVE-2026-56099

CVE-2026-56099

Medium

Open

TLP:CLEAR

OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input

NVD CVE.org

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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.

Details

CVSS Score: 6.9
EPSS Score ⓘ: 0.42%

35th percentile
CVSS 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
Confidence: 90%
Published: Jun 18, 2026
Last Modified: Jul 14, 2026

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