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.

CVSS v3 5.8 MEDIUM

5.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 3.7

Attack Vector ADJACENT_NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html	Third Party Advisory Exploit
https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8	Patch
https://www.openwall.com/lists/oss-security/2026/06/16/9	Exploit Mailing List Patch Third Party Advisory
https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py	Exploit

Configurations

Configuration 1 (hide)

cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*

History

13 Jul 2026, 13:54

Type	Values Removed	Values Added
First Time		Openbsd openbsd Openbsd
CPE		cpe:2.3:o:openbsd:openbsd::::::::
References	~~() https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html -~~	() https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html - Third Party Advisory, Exploit
References	~~() https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8 -~~	() https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8 - Patch
References	~~() https://www.openwall.com/lists/oss-security/2026/06/16/9 -~~	() https://www.openwall.com/lists/oss-security/2026/06/16/9 - Exploit, Mailing List, Patch, Third Party Advisory
References	~~() https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py -~~	() https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py - Exploit

17 Jun 2026, 16:24

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-17 13:20

Updated : 2026-07-13 13:54

NVD link : CVE-2026-55706

Mitre link : CVE-2026-55706

CVE.ORG link : CVE-2026-55706

JSON object : View

Products Affected

openbsd

openbsd

CWE

CWE-1284

Improper Validation of Specified Quantity in Input

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