Buffer overflow in Accel-Ppp
CVE-2026-123205
accel-ppp before 1.15.0 contains a heap buffer overflow vulnerability in the tcp, syslog and pgsql log targets that allows unauthenticated remote peers to overflow fixed heap buffers by producing log lines exceeding LOG_MAX_SIZE. Attackers within client-ip-range can send an L2TP Start-Control-Connection-Request with many string AVPs when verbose logging is enabled to corrupt heap memory and crash the daemon.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/accel-ppp/accel-ppp/blob/048d31cb446879e0d1a1471b4ab99135a92bf289/ac… (technical-description)
- github.com/accel-ppp/accel-ppp/commit/58e399400c4ef4b71472ab7c2c71c54a677a05a8 (patch)
- github.com/accel-ppp/accel-ppp/pull/374 (issue-tracking, patch)
- accel-ppp 1.15.0 Release Notes (release-notes)
- VulnCheck Advisory: accel-ppp before 1.15.0 Heap-based Buffer Overflow via oversized log lines in log_tcp/log_syslog/log_pgsql (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123205?
- CVE-2026-123205 is a medium-severity vulnerability in Accel-Ppp, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-11-05.
- How severe is CVE-2026-123205?
- Medium severity. CVSS v3 base score is 6.5 out of 10.