Medium 5.8Published Jun 16, 2026

CVE-2026-55706sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.

Updated under an hour ago (Oct 26, 2026, 8:40 PM ET)

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Exploited in the last 30 days

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

CVSS: 5.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Weakness (CWE): CWE-1284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

OpenBSD OpenBSD openbsd:openbsd (from the name)	before 076e2b1c1fc4ac0883a72d3544131ad5cee7adf8	CNA record
openbsd openbsd openbsd:openbsd	through 7.6	NVD

References

References

https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html	third-party-advisory, exploit
https://www.openwall.com/lists/oss-security/2026/06/16/9	exploit, mailing-list, patch, third-party-advisory
https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8	patch
https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py	exploit

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.