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Open5GS CVE-2026-78156

| EUVDEUVD-2026-64674 LOW
Buffer Overflow (CWE-119)
2026-08-24 cna@vuldb.com GHSA-r7gh-36fg-wvj8
Buffer Overflow
2.1
CVSS 4.0 · Vendor: vuldb

Severity by source

Vendor (vuldb) PRIMARY
2.1 LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.3 MEDIUM

Network-reachable Diameter interface but requires low-privilege peer authentication (PR:L); impact capped at low across C/I/A consistent with CVSS 4.0 source data.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

Primary rating from Vendor (vuldb).

CVSS VectorVendor: vuldb

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Aug 24, 2026 - 00:30 vuln.today
Analysis Generated
Aug 24, 2026 - 00:30 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Heap-based buffer overflow in Open5GS 2.8.0's HSS S6a Authentication-Information-Request handler allows network-adjacent authenticated Diameter peers to corrupt process heap memory by supplying a malformed Visited-PLMN-Id AVP with an incorrect octet-string length. The vulnerable function hss_ogs_diam_s6a_air_cb in src/hss/hss-s6a-path.c passes raw AVP data to cryptographic key derivation (ogs_auc_kasme) without first validating that the PLMN identifier length matches the expected 3-byte constant OGS_PLMN_ID_LEN. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain authenticated Diameter peer access on S6a interface
Delivery
Craft AIR with Visited-PLMN-Id AVP of incorrect length
Exploit
Submit malformed request to HSS S6a handler
Execution
Bypass absent length validation in hss_ogs_diam_s6a_air_cb
Persist
Trigger heap buffer overflow in ogs_auc_kasme call
Impact
Crash HSS process or achieve code execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to establish a Diameter S6a connection to the HSS with low-privilege Diameter peer credentials (PR:L per the supplied CVSS 4.0 vector), which in practice means having network access to the EPC's internal signaling plane - typically not reachable from the public internet. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 4.0 score of 2.1 with uniformly low impact metrics (VC:L/VI:L/VA:L/SC:L/SI:L/SA:L) appears understated relative to a heap overflow in a core authentication component; the low score reflects the constrained deployment context rather than inherent exploitability - PR:L requires Diameter peer credentials, which are not publicly obtainable. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with access to the core network Diameter segment - such as a compromised MME, a rogue signaling node inserted via SS7/Diameter interconnect, or a malicious insider - establishes a Diameter S6a connection to the Open5GS HSS and sends a crafted Authentication-Information-Request containing a Visited-PLMN-Id AVP whose octet-string length exceeds the expected 3-byte `OGS_PLMN_ID_LEN`. The HSS processes the request without validating the AVP length, triggering a heap buffer overflow in `hss_ogs_diam_s6a_air_cb` when the oversized data propagates into `ogs_auc_kasme()`. …
Remediation Apply upstream fix commit a9c82ee0b590d76a581b0580cb46b598984e2392 from https://github.com/open5gs/open5gs/commit/a9c82ee0b590d76a581b0580cb46b598984e2392 - a specific tagged release version incorporating this commit is not independently confirmed from the available data, so operators should monitor the Open5GS GitHub repository for a formal release or apply the commit directly to their build. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-78156 vulnerability details – vuln.today
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