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Vulnerability Details :

CVE-2026-55706

Summary
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At-17 Jun, 2026 | 00:53
Updated At-17 Jun, 2026 | 14:33
Rejected At-
Credits

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

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:mitre
Assigner Org ID:8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At:17 Jun, 2026 | 00:53
Updated At:17 Jun, 2026 | 14:33
Rejected At:
▼CVE Numbering Authority (CNA)

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

Affected Products
Vendor
OpenBSDOpenBSD
Product
OpenBSD
Default Status
unaffected
Versions
Affected
  • From 0 before 076e2b1c1fc4ac0883a72d3544131ad5cee7adf8 (git)
Problem Types
TypeCWE IDDescription
CWECWE-1284CWE-1284 Improper Validation of Specified Quantity in Input
Type: CWE
CWE ID: CWE-1284
Description: CWE-1284 Improper Validation of Specified Quantity in Input
Metrics
VersionBase scoreBase severityVector
3.15.8MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Version: 3.1
Base score: 5.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html
N/A
https://www.openwall.com/lists/oss-security/2026/06/16/9
N/A
https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8
N/A
Hyperlink: https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html
Resource: N/A
Hyperlink: https://www.openwall.com/lists/oss-security/2026/06/16/9
Resource: N/A
Hyperlink: https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py
exploit
Hyperlink: https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py
Resource:
exploit
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve@mitre.org
Published At:17 Jun, 2026 | 13:20
Updated At:13 Jul, 2026 | 13:54

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

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.15.8MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Primary3.18.3HIGH
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
N/A
Type: Secondary
Version: 3.1
Base score: 5.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Type: Primary
Version: 3.1
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

OpenBSD
openbsd
>>openbsd>>Versions up to 7.6(inclusive)
cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-1284Secondarycve@mitre.org
CWE ID: CWE-1284
Type: Secondary
Source: cve@mitre.org
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.htmlcve@mitre.org
Third Party Advisory
Exploit
https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8cve@mitre.org
Patch
https://www.openwall.com/lists/oss-security/2026/06/16/9cve@mitre.org
Exploit
Mailing List
Patch
Third Party Advisory
https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Hyperlink: https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html
Source: cve@mitre.org
Resource:
Third Party Advisory
Exploit
Hyperlink: https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8
Source: cve@mitre.org
Resource:
Patch
Hyperlink: https://www.openwall.com/lists/oss-security/2026/06/16/9
Source: cve@mitre.org
Resource:
Exploit
Mailing List
Patch
Third Party Advisory
Hyperlink: https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit

Change History

0
Information is not available yet

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Vendor-OpenBSD
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Assigner-MITRE Corporation
ShareView Details
Matching Score-6
Assigner-MITRE Corporation
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EPSS-0.21% / 11.06%
||
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Published-20 Apr, 2026 | 00:00
Updated-24 Apr, 2026 | 18:59
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

In OpenBSD through 7.8, the slaacd and rad daemons have an infinite loop when they receive a crafted ICMPv6 Neighbor Discovery (ND) option (over a local network) with length zero, because of an "nd_opt_len * 8 - 2" expression with no preceding check for whether nd_opt_len is zero.

Action-Not Available
Vendor-OpenBSD
Product-openbsdOpenBSD
CWE ID-CWE-1284
Improper Validation of Specified Quantity in Input
CWE ID-CWE-835
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Details not found