PT-2026-50785 · Openbsd · Src

Argus Systems · Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-56099

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-56099

Affected Products

Src

References · 4

• 🔥 https://pop.argus-systems.ai/advisory/adv-040.html · Exploit
• https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-56099 · Security Note
• https://vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-input · Note