CVE-2026-78156 Open5GS S6a Authentication-Information-Request hss-s6a-path.c hss_ogs_diam_s6a_air_cb heap-based overflow
Remote attackers can trigger a heap-based buffer overflow in Open5GS via crafted S6a requests, potentially leading to code execution or service disruption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78156?
CVE-2026-78156 is a medium-severity memory corruption vulnerability in Open5GS, published on 23 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security vulnerability has been detected in Open5GS 2.8.0. Affected by this issue is the function hss_ogs_diam_s6a_air_cb of the file src/hss/hss-s6a-path.c of the component S6a Authentication-Information-Request Handler. Such manipulation of the argument Visited-PLMN-Id leads to heap-based buffer overflow. The attack may be performed from remote. The name of the patch is a9c82ee0b590d76a581b0580cb46b598984e2392. A patch should be applied to remediate this issue.
Which versions are affected by CVE-2026-78156?
How do I fix CVE-2026-78156?
No fix has been published for CVE-2026-78156 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-78156 being exploited?
There is no known exploitation of CVE-2026-78156 in the wild and no public exploit code.
Sources
Also known as GHSA-r7gh-36fg-wvj8.