Vulnerability · Published Aug 23, 2026 · Assigned by VulDB

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

High 7.4

In plain English

A high-severity heap buffer overflow in Open5GS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.6%top 53.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
n/a	Open5GS	2.8.0

Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L/E:P/RL:O/RC:C

References

VDB-394539 | Open5GS S6a Authentication-Information-Request hss-s6a-path.c hss_ogs_diam_s6a_air_cb heap-based overflow vdb-entry, technical-description
VDB-394539 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-78156 | CVE Analysis and Report third-party-advisory
Submit #882951 | Open5GS 2.8.0 Heap Buffer Overflow third-party-advisory
https://github.com/open5gs/open5gs/issues/4661 issue-tracking
https://github.com/open5gs/open5gs/commit/a9c82ee0b590d76a581b0580cb46b598984e2392 patch
https://github.com/open5gs/open5gs/ product