{"id":"CVE-2026-56099","aliases":["EUVD-2026-37938","GHSA-6qv5-f6m3-44g8"],"status":"published","title":"OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input","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.","severity":{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.005,"percentile":0.43172,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2026-06-18T19:29:08Z","modified":"2026-10-28T11:10:01Z","products":[{"vendor":"netbsd","product":"src"},{"vendor":"openbsd","product":"openbsd"},{"vendor":"openbsd","product":"src"}],"references":[{"url":"https://pop.argus-systems.ai/advisory/adv-040.html","tags":["technical-description","exploit","Exploit","Patch","Third Party Advisory","evidence"]},{"url":"https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd","tags":["patch","Patch","fix"]},{"url":"https://www.vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-input","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/06/19/3","tags":["Exploit","Mailing List","Patch","Third Party Advisory","web"]},{"url":"http://seclists.org/fulldisclosure/2026/Jun/17","tags":["Exploit","Mailing List","Patch","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56099","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-6qv5-f6m3-44g8"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56099.json","tags":["advisory"]},{"url":"https://github.com/openbsd/src","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-56099","title":"OpenBSD mpls_do_error Kernel Stack Memory 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