Out-of-bounds Read in Open5gs
CVE-2026-108103
Open5GS through 2.8.0 contains a heap out-of-bounds read vulnerability in ogs_pfcp_parse_dropped_dl_traffic_threshold() that allows remote unauthenticated attackers to read past IE buffers via short IEs. Attackers can send PFCP Session Establishment or Modification Requests to the UPF on UDP port 8805 with DLPA and DLBY flags set, potentially crashing the UPF.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
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/open5gs/open5gs/commit/88e64fc1f87e0d321364b3bb710ef6a8f274e568 (patch)
- github.com/open5gs/open5gs (product)
- github.com/open5gs/open5gs/blob/v2.8.0/lib/pfcp/types.c (technical-description)
- www.vulncheck.com/advisories/open5gs-through-2.8.0-heap-out-of-bounds-read-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108103?
- CVE-2026-108103 is a medium-severity vulnerability in Open5gs, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-10-09.
- How severe is CVE-2026-108103?
- Medium severity. CVSS v3 base score is 5.3 out of 10.