CVE-2026-75883: CWE-122 Heap-based buffer overflow in PPP Project ppp
CVE-2026-75883 is a heap-based buffer overflow vulnerability in the PPP Project's pppd component. The flaw occurs in the peap_response() function, which copies a TLS record of up to 16384 bytes into a fixed-size global buffer without verifying available space or implementing fragmentation. This can lead to corruption of adjacent global static data, potentially causing incorrect behavior or process crashes during PEAP authentication.
AI Analysis
Technical Summary
The vulnerability in pppd arises from improper handling of PEAP Request packets. Specifically, the peap_response() function copies an entire TLS record into a fixed global buffer (outpacket_buf) without bounds checking or fragmentation support. Since the TLS record can be up to 16384 bytes, this unchecked copy can overflow the buffer and corrupt adjacent static data. This occurs when pppd connects to a server requesting PEAP authentication, leading to potential memory corruption and instability.
Potential Impact
Successful exploitation can cause corruption of global static data following the outpacket_buf buffer, likely resulting in incorrect program behavior or crashes. The vulnerability affects confidentiality and integrity as indicated by the CVSS vector, but does not directly impact availability. No known exploits are reported in the wild.
Mitigation Recommendations
No official patch or fix is currently documented. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid connecting pppd to untrusted PEAP authentication servers or disable PEAP authentication if possible.
CVE-2026-75883: CWE-122 Heap-based buffer overflow in PPP Project ppp
Description
CVE-2026-75883 is a heap-based buffer overflow vulnerability in the PPP Project's pppd component. The flaw occurs in the peap_response() function, which copies a TLS record of up to 16384 bytes into a fixed-size global buffer without verifying available space or implementing fragmentation. This can lead to corruption of adjacent global static data, potentially causing incorrect behavior or process crashes during PEAP authentication.
CVSS v3.1
Score 6.8medium
Affected software
PPP Project
ppp
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in pppd arises from improper handling of PEAP Request packets. Specifically, the peap_response() function copies an entire TLS record into a fixed global buffer (outpacket_buf) without bounds checking or fragmentation support. Since the TLS record can be up to 16384 bytes, this unchecked copy can overflow the buffer and corrupt adjacent static data. This occurs when pppd connects to a server requesting PEAP authentication, leading to potential memory corruption and instability.
Potential Impact
Successful exploitation can cause corruption of global static data following the outpacket_buf buffer, likely resulting in incorrect program behavior or crashes. The vulnerability affects confidentiality and integrity as indicated by the CVSS vector, but does not directly impact availability. No known exploits are reported in the wild.
Mitigation Recommendations
No official patch or fix is currently documented. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid connecting pppd to untrusted PEAP authentication servers or disable PEAP authentication if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-08-18T13:09:30.492Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aadb77055bf5e2cf59e6403
Added to database: 09/18/2026, 22:13:04 UTC
Last enriched: 09/18/2026, 22:14:52 UTC
Last updated: 09/18/2026, 22:14:52 UTC
Views: 2
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