Is CVE-2026-116543 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-116543?

CVE-2026-116543 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-116543

Description

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.