Authenticated memory over-read via short PLMN identifier
Published Aug 23, 2026 · Updated Aug 23, 2026
Heap buffer over-read in the Open5GS 2.8.0 HSS allows remote authenticated users to trigger an out-of-bounds read via a crafted S6a AIR. The hss_ogs_diam_s6a_air_cb function passes the raw Visited-PLMN-Id buffer to ogs_auc_kasme, which always reads three bytes without first validating the AVP length. The peer must complete Diameter peering and send a zero- or two-byte identifier; public evidence demonstrates the invalid read but not a crash or returned-memory disclosure.
Summary
What happened
Heap buffer over-read in the Open5GS 2.8.0 HSS allows remote authenticated users to trigger an out-of-bounds read via a crafted S6a AIR. The hss_ogs_diam_s6a_air_cb function passes the raw Visited-PLMN-Id buffer to ogs_auc_kasme, which always reads three bytes without first validating the AVP length. The peer must complete Diameter peering and send a zero- or two-byte identifier; public evidence demonstrates the invalid read but not a crash or returned-memory disclosure.
The record
- CVE
- CVE-2026-78156
- Published
- Aug 23, 2026
- Updated
- Aug 23, 2026
- Vendor
- Open5GS
- Product
- Open5GS
- Classifications
- CWE-119, CWE-122, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 23, 2026CVE publishedPublication date reported by the CVE source.
- Aug 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.8.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Short Visited-PLMN-Id reproduction procedureproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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