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CVE-2026-56099— OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input

Quick assessment

Affected
openbsd src
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBSD是加拿大OpenBSD基金会开源的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD存在缓冲区错误漏洞，该漏洞源于mpls_do_error函数存在越界读取漏洞，可能导致远程攻击者通过发送带有16个标签且未设置堆栈底部位的特制MPLS帧，泄露内核栈内存。

CVSS 5.3 · Medium EPSS 0.50% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
openbsd src < 6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd affected
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I. Basic Information for CVE-2026-56099

Vulnerability Information
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Vulnerability Title
OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBSD 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBSD是加拿大OpenBSD基金会开源的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD存在缓冲区错误漏洞，该漏洞源于mpls_do_error函数存在越界读取漏洞，可能导致远程攻击者通过发送带有16个标签且未设置堆栈底部位的特制MPLS帧，泄露内核栈内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbsd src 0 ~ 6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd -

II. Public POCs for CVE-2026-56099

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III. Intelligence Information for CVE-2026-56099

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Patches & Fixes for CVE-2026-56099 (1)

Vendor Advisories for CVE-2026-56099 (2)

IV. Related Vulnerabilities

Same product: src
Same vendor: openbsd
Same weakness: CWE-125

V. Comments for CVE-2026-56099

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