CVE-2026-123205

MEDIUM 6.5

accel-ppp before 1.15.0 Heap-based Buffer Overflow via oversized log lines in log_tcp/log_syslog/log_pgsql

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-122
Vendor	accel-ppp
Product	accel-ppp
Published	Nov 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

accel-ppp / accel-ppp

0 < 1.15.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/accel-ppp/accel-ppp/pull/374 github.com: https://github.com/accel-ppp/accel-ppp/commit/58e399400c4ef4b71472ab7c2c71c54a677a05a8 github.com: https://github.com/accel-ppp/accel-ppp/releases/tag/1.15.0 github.com: https://github.com/accel-ppp/accel-ppp/blob/048d31cb446879e0d1a1471b4ab99135a92bf289/accel-pppd/logs/log_tcp.c#L55-L67 vulncheck.com: https://www.vulncheck.com/advisories/accel-ppp-before-1.15.0-heap-based-buffer-overflow-via-oversized-log-lines-in-log-tcp-log-syslog-log-pgsql

Credits

Deus Rex Denys Fedoryshchenko (nuclearcat)