What is CVE-2026-55706?

CVE-2026-55706 is a medium-severity vulnerability in Openbsd, classified under Improper Validation of Specified Quantity in Input. CVSS score: 5.8/10. Published 2026-06-17.

How severe is CVE-2026-55706?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Vulnerability in Openbsd

CVE-2026-55706

sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.

EPSS: 0.004 (28.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L.

Affected products

Openbsd — versions 0

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

References

cve@mitre.org (Exploit, Third Party Advisory)
cve@mitre.org (Exploit, Patch, Mailing List, Third Party Advisory)
cve@mitre.org (Patch)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit)

Frequently asked questions

What is CVE-2026-55706?: CVE-2026-55706 is a medium-severity vulnerability in Openbsd, classified under Improper Validation of Specified Quantity in Input. CVSS score: 5.8/10. Published 2026-06-17.
How severe is CVE-2026-55706?: Medium severity. CVSS v3 base score is 5.8 out of 10.