CVE-2026-55706: sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zer

Q: How do I fix CVE-2026-55706?

openbsd: upgrade to newer than 7.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-55706 being exploited?

CVE-2026-55706 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-55706 affect?

CVE-2026-55706 affects openbsd. Severity is medium (CVSS 5.8). sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.

Q: How urgent is CVE-2026-55706?

Priority 33/100. Public exploit reference

Routine

MEDIUM 5.8UPGRADE

CVE-2026-55706 is a medium-severity flaw (CVSS 5.8) affecting openbsd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.8 (Medium)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-1284
Published	2026-06-17
Last modified	2026-07-13

Publisher (CNA): MITRE · Vendor: openbsd

Last updated 2026-07-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 13:20 UTCPublished CVE record published
2026-07-13 13:54 UTCUpdated Record last modified

openbsd openbsd UPGRADE

Affected: <= 7.6

Fixed in: newer than 7.6

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-55706?

openbsd: upgrade to newer than 7.6. Exact commands for each OS are on this page.

Is CVE-2026-55706 being exploited?

CVE-2026-55706 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-55706 affect?

CVE-2026-55706 affects openbsd. Severity is medium (CVSS 5.8). sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.

How urgent is CVE-2026-55706?

Priority 33/100. Public exploit reference

Related CVEs

CVE-2026-56099 MEDIUM 5.3 UPGRADE OpenBSD before commit 6a23123 (2026-06-18) contains an out-of-bounds read vulnerability in the mpls_do_error f
CVE-2026-57589 HIGH 7.4 UPGRADE sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root

References

← Back to latest CVEs