{"items":[{"id":"NVI-00017717","kind":"vulnerability","title":"GoBGP: BGP OPEN capability parser may read capability values outside declared CapLen boundaries","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-gjrg-jjr3-56cm","CVE-2026-49837"],"plain_summary":"GitHub lists this reviewed advisory for github.com/osrg/gobgp/v4. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-4e6b2f3fce54e15ac95871f0ad26a62e"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-09T23:20:58.000Z","value":"5.9 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-4e6b2f3fce54e15ac95871f0ad26a62e"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-4e6b2f3fce54e15ac95871f0ad26a62e","url":"https://github.com/advisories/GHSA-gjrg-jjr3-56cm","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-gjrg-jjr3-56cm","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T23:34:40.400Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-4e6b2f3fce54e15ac95871f0ad26a62e"],"technology":"github.com/osrg/gobgp/v4","known_exclusions":[],"conditions_summary":"### Summary\n    GoBGP contains a BGP OPEN capability parsing issue where several concrete capability decoders may parse data from the full remaining capability buffer instead of the slice bounded by the declared capability length, `CapLen`.\n    A malformed BGP OPEN message can cause bytes from a following capability to be interpreted as part of the current capability. The most security-relevant case is the 4-octet AS capability, where a capability with `CapLen == 0` may cause the parser to read bytes from the following capability as the 4-octet AS value. This parsed value may later affect peer AS validation during BGP session establishment.\n\n### Details\nThe issue is in the BGP OPEN capability parser under:\n\n- `pkg/packet/bgp/bgp.go`\n- `pkg/packet/bgp/validate.go`\n- \nThe BGP OPEN optional parameter capability format includes a capability code, a capability length field, and a capability value. Each concrete capability decoder should only parse bytes inside the declared capability value boundary.\nIn affected versions, the generic capability parser records the declared `CapLen`, but several concrete capability decoders continue parsing from the full remaining capability buffer after a","public_affected_ranges":["<= 4.5.0"]}],"null_published_at":"2026-11-05T19:10:21.456Z","source_updated_at":"2026-07-09T23:20:58.000Z","source_disclosed_at":"2026-07-09T23:20:57.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-04T23:34:40.400Z"}],"next_cursor":null,"snapshot_revision":"42594"}