CVE catalog
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 st
- Severity
- Medium · CVSS 6.9
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.50% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | openbsd | Not reported | 2026-06-18 | fixed |
| Cpe | openbsd | Not reported | 2026-06-18 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | openbsd | cpe | Not reported | 2026-06-18 | Not reported | Not reported | Not reported |
| Cpe | openbsd | cpe | Not reported | 2026-06-18 | Not reported | NVD-CVE-2026-56099 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [http://seclists.org/fulldisclosure/2026/Jun/17]
- [http://www.openwall.com/lists/oss-security/2026/06/19/3]
- [https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-56099]
- [https://pop.argus-systems.ai/advisory/adv-040.html]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2003.json]
- [https://www.vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-input]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)]