{"items":[{"id":"NVI-00011713","kind":"vulnerability","title":"Sliver: Unauthenticated Memory Exhaustion Denial of Service in Sliver HTTP(S) Listener PNG Decoder","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-663m-7x7m-g4fw","CVE-2026-77622"],"plain_summary":"GitHub lists this reviewed advisory for github.com/BishopFox/sliver. 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-0b522bff9c3f77927be135dd8bba3f62"],"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":[],"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-0b522bff9c3f77927be135dd8bba3f62","url":"https://github.com/advisories/GHSA-663m-7x7m-g4fw","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-663m-7x7m-g4fw","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:14:22.124Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0b522bff9c3f77927be135dd8bba3f62"],"technology":"github.com/BishopFox/sliver","known_exclusions":[],"conditions_summary":"### Summary\nSliver is vulnerable to a Denial of Service (DOS) attack because there is no cap in the size of a PNG file that can be sent to an open http listener and there is a small amount of possible nonces. This vulnerability lets the attacker completely max out the RAM of the machine running server, leading to a complete loss of availability. \n### Details\n\nThe first vulnerability is that the amount of possible nonces is 65,537. This is found in `server/encoders/encoders.go`\n```go\nconst (\n    EncoderModulus = uint64(65537)\n)\n```\n\nThe second vulnerability is there is no limit to how many pixels the PNG encoder will accept from an unauthenticated user. This is found in:\n`util/encoders/images.go`\n\n```go\nfunc (p PNGEncoder) Encode(data []byte) ([]byte, error) {\n    img := imageFromBytes(data)\n    var buf bytes.Buffer\n    encoder.Encode(&buf, img)\n    return buf.Bytes(), nil\n}\n\nfunc (p PNGEncoder) Decode(data []byte) ([]byte, error) {\n    buf := bytes.NewBuffer(data)\n    img, err := png.Decode(buf)\n    if err != nil { return nil, err }\n    return bytesFromImage(img), nil\n}\n```\n\n### PoC\nThe first step to reproduce this vulnerability is building a docker container to make sure no harm i","public_affected_ranges":["< 1.7.6"]}],"null_published_at":"2026-11-01T01:03:56.589Z","source_updated_at":"2026-10-15T20:09:34.000Z","source_disclosed_at":"2026-10-15T20:09:33.000Z","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":"2026-10-31T23:14:22.124Z"}],"next_cursor":null,"snapshot_revision":"42594"}