High severity · published Aug 23, 2026
CVE-2026-78156
Open5GS S6a Authentication-Information-Request hss-s6a-path.c hss_ogs_diam_s6a_air_cb heap-based overflow
7.4
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Open5GS · Open5gs
2.8.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78156
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78156
github.com
https://github.com/open5gs/open5gs/
github.com
https://github.com/open5gs/open5gs/commit/a9c82ee0b590d76a581b0580cb46b598984e2392
github.com
https://github.com/open5gs/open5gs/issues/4661
vuldb.com
https://vuldb.com/cve/CVE-2026-78156
vuldb.com
https://vuldb.com/submit/882951
vuldb.com
https://vuldb.com/vuln/394539
More from Open5GS
9.8
CVE-2026-2522
Open5GS MME esm-build.c memory corruption
9.8
CVE-2026-2521
Open5GS SGW-C sgwc_s5c_handle_create_session_response memory corruption
9.8
CVE-2024-40130
open5gs v2.6.4 is vulnerable to Buffer Overflow
9.8
CVE-2024-40129
Open5GS v2.6.4 is vulnerable to Buffer Overflow
9.8
CVE-2021-28122
A request-validation issue was discovered in Open5GS 2.1.3 through 2.2.x before 2.2.1