CVE-2026-75883 PPPD buffer overflow in PEAP response code
A buffer overflow in pppd's PEAP response handling allows a malicious server to corrupt memory, likely causing a crash or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-75883?
CVE-2026-75883 is a medium-severity memory corruption vulnerability in ppp, published on 18 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-75883?
How do I fix CVE-2026-75883?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-75883 being exploited?
There is no known exploitation of CVE-2026-75883 in the wild and no public exploit code.
Sources
Also known as AZL-103302, BELL-CVE-2026-75883, DEBIAN-CVE-2026-75883, GHSA-rwr9-4vx8-vc35, OESA-2026-4116, OESA-2026-4117 and 2 more.