CVE-2026-78156: Open5GS S6a Authentication-Information-Request hss-s6a-path.c hss_ogs_diam_s6a_air_cb heap-based overflow

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-24 · updated 2026-10-14
Weakness: CWE-119

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.

Affected products

Open5GS: 2.8.0

References

https://github.com/open5gs/open5gs/
https://github.com/open5gs/open5gs/commit/a9c82ee0b590d76a581b0580cb46b598984e2392
https://github.com/open5gs/open5gs/issues/4661
https://vuldb.com/cve/CVE-2026-78156
https://vuldb.com/submit/882951
https://vuldb.com/vuln/394539
https://vuldb.com/vuln/394539/cti

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