CVE-2026-75883 — MEDIUM (6.8)

Vulnerability Description

The code in pppd that formats a response to a PEAP Request packet in peap_response() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacket_buf without checking the available space and without implementing outgoing PEAP fragmentation. Thus a pppd process connecting to a server which requests PEAP authentication can be induced to corrupt global static data following the outpacket_buf array, most likely causing incorrect behavior or a crash.

CVSS Score

6.8

MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

ADJACENT_NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-122

References

https://github.com/ppp-project/ppp/security/advisories/GHSA-rwr9-4vx8-vc35

FAQ

What is CVE-2026-75883?

CVE-2026-75883 is a vulnerability with a CVSS score of 6.8 (MEDIUM). The code in pppd that formats a response to a PEAP Request packet in peap_response() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacket_buf without checking the a...

How severe is CVE-2026-75883?

CVE-2026-75883 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-75883?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.