CVE-2026-56099

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.

• CWE-125

• https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfdPatch
• https://pop.argus-systems.ai/advisory/adv-040.htmlExploit, Patch, Third Party Advisory
• https://www.vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-inputThird Party Advisory
• http://seclists.org/fulldisclosure/2026/Jun/17Exploit, Mailing List, Patch, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2026/06/19/3Exploit, Mailing List, Patch, Third Party Advisory

Published

Jun 18, 2026

Last Modified

Jul 14, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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