{"id":"CVE-2026-1521","summary":"Open5GS SGWC s5c-handler.c denial of service","details":"A security flaw has been discovered in Open5GS up to 2.7.6. This affects the function sgwc_s5c_handle_bearer_resource_failure_indication of the file src/sgwc/s5c-handler.c of the component SGWC. Performing a manipulation results in denial of service. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The patch is named 69b53add90a9479d7960b822fc60601d659c328b. It is recommended to apply a patch to fix this issue.","modified":"2026-08-12T15:31:26.992097Z","published":"2026-01-28T14:32:10.348Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"2.7.3"},{"last_affected":"2.7.3"},{"introduced":"2.7.4"},{"last_affected":"2.7.4"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"VulDB","cwe_ids":["CWE-404"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1521.json"},"references":[{"type":"WEB","url":"https://github.com/open5gs/open5gs/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1521.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1521"},{"type":"ADVISORY","url":"https://vuldb.com/?id.343192"},{"type":"ADVISORY","url":"https://vuldb.com/?submit.738370"},{"type":"REPORT","url":"https://github.com/open5gs/open5gs/issues/4268"},{"type":"REPORT","url":"https://github.com/open5gs/open5gs/issues/4268#event-21989483261"},{"type":"REPORT","url":"https://github.com/open5gs/open5gs/issues/4268#issue-3795012861"},{"type":"REPORT","url":"https://vuldb.com/?ctiid.343192"},{"type":"FIX","url":"https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open5gs/open5gs","events":[{"introduced":"0"},{"fixed":"69b53add90a9479d7960b822fc60601d659c328b"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"2.7.6"}]}}],"versions":["2.7.0","2.7.1","2.7.2","2.7.5","2.7.6","v2.7.2","v2.7.1","v2.7.0","v2.6.6","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.4.9","v2.4.8","v2.4.7","v2.4.5","v2.4.4","v2.4.3","v2.4.1","v2.4.0","v2.3.6","v2.3.2","v2.3.0","v2.2.9","v2.2.8","v2.2.7","v2.2.6","v2.2.1","v2.2.0","v2.1.7","v2.1.5","v2.1.4","v2.1.3","v2.1.1","v2.1.0","v2.0.22","v2.0.18","v2.0.0","v1.3.0","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.0","v1.0.0","v0.5.2","v0.5.1","v0.5.0","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.3.10","v0.3.8","v0.3.6","v0.3.5","v0.3.4","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.0","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1521.json","vanir_signatures_modified":"2026-08-12T15:31:26Z","vanir_signatures":[{"source":"https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b","target":{"file":"src/sgwc/s5c-handler.c","function":"sgwc_s5c_handle_delete_session_response"},"deprecated":false,"digest":{"function_hash":"15508307772982429633011957499214041995","length":1655},"id":"CVE-2026-1521-0fa0087d","signature_type":"Function","signature_version":"v1"},{"id":"CVE-2026-1521-12e268d6","signature_type":"Line","signature_version":"v1","source":"https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b","target":{"file":"src/sgwc/s5c-handler.c"},"deprecated":false,"digest":{"line_hashes":["25812427068751860969159990134597307978","7222066163203399397211561522002353510","96942117271000208749064346855104249832","113382261343527669094962999287356753941","25812427068751860969159990134597307978","7222066163203399397211561522002353510","96942117271000208749064346855104249832","135513109587151866415305291539791363890","25812427068751860969159990134597307978","7222066163203399397211561522002353510","96942117271000208749064346855104249832","113382261343527669094962999287356753941","179342029530937546220693424464317231887","168270296695758502613696484442644910245","151740391447207286781117636294302217573","179685029504330156438529145634502608597","298857582282049929916713191002565277261","130585704969285285511167422994750579028","244750286989761738896379403658891274619","33275739632645840872134927330672984445"],"threshold":0.9}},{"target":{"function":"sgwc_s5c_handle_create_session_response","file":"src/sgwc/s5c-handler.c"},"deprecated":false,"digest":{"function_hash":"248441703319746844892426604258065214562","length":6447},"id":"CVE-2026-1521-4b3d43ed","signature_type":"Function","signature_version":"v1","source":"https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b"},{"deprecated":false,"digest":{"length":852,"function_hash":"177637928081034831759304430883841790241"},"id":"CVE-2026-1521-91a83e2a","signature_type":"Function","signature_version":"v1","source":"https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b","target":{"file":"src/sgwc/s5c-handler.c","function":"sgwc_s5c_handle_bearer_resource_failure_indication"}},{"source":"https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b","target":{"function":"sgwc_s5c_handle_modify_bearer_response","file":"src/sgwc/s5c-handler.c"},"deprecated":false,"digest":{"function_hash":"191995944558783431321902945343140142373","length":3381},"id":"CVE-2026-1521-a3e407f0","signature_type":"Function","signature_version":"v1"}]}}],"schema_version":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