Skip to content
Heist/ feed
Back to feed
Medium

PPPD buffer overflow in PEAP response code

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-75883
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 08:36 UTC · Revision 1

Source evidence

PPPD buffer overflow in PEAP response code

core-osv · Original source

Published 18 Sept 2026, 15:29 UTC

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.

osv:CVE-2026-75883
Complete source record
{
  "id": "bc4db19772963cd754975ebf1170bcb8b0fb03e7da584c95a2000cb2f9e28531",
  "url": "https://osv.dev/vulnerability/CVE-2026-75883",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PPPD buffer overflow in PEAP response code",
    "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 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.",
    "evidence": "osv:CVE-2026-75883",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-75883",
      "aliases": [
        "CVE-2026-75883",
        "GHSA-rwr9-4vx8-vc35"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ppp-project/ppp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "760ce18f82670eb81cc186fb792919339a2e2fbe"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.5.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.5.0",
            "ppp-2.5.0",
            "v2.4.9",
            "ppp-2.4.9",
            "2.4.9",
            "v2.4.8",
            "ppp-2.4.8",
            "v2.4.7",
            "ppp-2.4.7",
            "v2.4.6",
            "ppp-2.4.6",
            "v2.4.5",
            "ppp-2.4.5",
            "v2.4.4",
            "ppp-2.4.4",
            "v2.4.3",
            "ppp-2.4.3",
            "v2.4.2",
            "ppp-2.4.2",
            "v2.4.1",
            "ppp-2.4.1",
            "v2.4.0",
            "ppp-2.4.0",
            "v2.3.11",
            "ppp-2.3.11",
            "v2.3.10",
            "ppp-2.3.10",
            "v2.3.9",
            "ppp-2.3.9",
            "v2.3.8",
            "ppp-2.3.8",
            "v2.3.7",
            "ppp-2.3.7",
            "v2.3.6",
            "ppp-2.3.6",
            "v2.3.5",
            "ppp-2.3.5",
            "v2.3.4",
            "ppp-2.3.4",
            "v2.3.3",
            "ppp-2.3.3",
            "v2.3.2",
            "ppp-2.3.2",
            "v2.3.1",
            "ppp-2.3.1",
            "v2.3.0",
            "ppp-2.3.0",
            "v2.2",
            "ppp-2.2",
            "v2.1.2",
            "ppp-2.1.2",
            "v2.1.1",
            "ppp-2.1.1",
            "v2.0.4",
            "ppp-2.0.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75883.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.092546466Z",
      "provider": "osv",
      "references": [
        "https://github.com/interchange/interchange/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75883.json",
        "https://github.com/ppp-project/ppp/security/advisories/GHSA-rwr9-4vx8-vc35",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-75883"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-122"
        ],
        "cna_assigner": "redhat",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75883.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-75883",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493879,
  "published_at": "2026-09-18T15:29:07.702+00:00"
}