Unrated severityNVD Advisory· Published Jun 18, 2026
OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input
CVE-2026-56099
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.
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Affected products
2Patches
Vulnerability mechanics
References
3- github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfdmitrepatch
- pop.argus-systems.ai/advisory/adv-040.htmlmitretechnical-descriptionexploit
- www.vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-inputmitrethird-party-advisory
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