Buffer overflow in Open5gs
CVE-2026-116543
Open5GS 1.3.0 through 2.8.0 contains a heap out-of-bounds write vulnerability in parse_multipart() that allows unauthenticated attackers to corrupt memory by supplying an empty multipart boundary. Attackers can send a single crafted multipart/related request to the SBI interface of any network function, overflowing the lookbehind buffer and crashing it.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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/open5gs/open5gs/security/advisories/GHSA-25v2-v588-jq8g (vendor-advisory)
- github.com/open5gs/open5gs/commit/6820c2743b5b5e126e3755d2f92dae2b236732df (patch)
- github.com/open5gs/open5gs/blob/v2.8.0/lib/sbi/message.c (technical-description)
- github.com/open5gs/open5gs/blob/v2.8.0/lib/sbi/contrib/multipart_parser.c (technical-description)
- github.com/open5gs/open5gs (product)
- www.vulncheck.com/advisories/open5gs-1.3.0-through-2.8.0-heap-out-of-bounds-wri… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116543?
- CVE-2026-116543 is a high-severity vulnerability in Open5gs, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-10-26.
- How severe is CVE-2026-116543?
- High severity. CVSS v3 base score is 7.5 out of 10.