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CVE-2026-55706

Quick assessment

Affected
OpenBSD OpenBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBSD是加拿大OpenBSD基金会开源的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD 076e2b1之前版本存在输入验证错误漏洞，该漏洞源于sppp_pap_input函数中长度值设置为零，可能导致绕过身份验证。

CVSS 5.8 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenBSD OpenBSD < 076e2b1c1fc4ac0883a72d3544131ad5cee7adf8 affected
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I. Basic Information for CVE-2026-55706

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBSD 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBSD是加拿大OpenBSD基金会开源的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD 076e2b1之前版本存在输入验证错误漏洞，该漏洞源于sppp_pap_input函数中长度值设置为零，可能导致绕过身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenBSD OpenBSD 0 ~ 076e2b1c1fc4ac0883a72d3544131ad5cee7adf8 -

II. Public POCs for CVE-2026-55706

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III. Intelligence Information for CVE-2026-55706

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Patches & Fixes for CVE-2026-55706 (1)

Mailing List Discussions for CVE-2026-55706 (1)

Security Blog Posts for CVE-2026-55706 (1)

IV. Related Vulnerabilities

Same product: OpenBSD
Same vendor: OpenBSD
Same weakness: CWE-1284

V. Comments for CVE-2026-55706

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