---
id: CVE-2026-75883
title: >-
  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 implementi…
summary: >-
  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 implementi…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-122
vendor: PPP Project
product: ppp
affected:
  - ppp <= 2.5.0
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T15:17:13.797'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75883'
references:
  - url: 'https://github.com/ppp-project/ppp/security/advisories/GHSA-rwr9-4vx8-vc35'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
epss: 0.00255
epssPercentile: 0.17458
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-22T14:43:07.472707Z'
ingestedAt: '2026-09-18T15:44:31.582Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.