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.

Affected

OpenBSD

CVSS v3.1 NVD

8.3 HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 MITRE

5.8 MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L

EPSS

0.34% chance of exploitation in the next 30 days, 26th percentile

Published

2026-06-17

Proof-of-concept exploits (1)

• https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py

Security advisories

• https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html
• https://www.openwall.com/lists/oss-security/2026/06/16/9
• openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8

References

• CVE Record
• NVD entry