{"items":[{"id":"NVI-00017613","kind":"vulnerability","title":"python-engineio has possible denial of service due to maximum payload size sometimes not being enforced","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m9gh-vj53-gvh9","CVE-2026-48809"],"plain_summary":"GitHub lists this reviewed advisory for python-engineio. 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-2eb8f1bcf1fdac383a8338a58e1761ca"],"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":"2026-06-26T20:48:19.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-2eb8f1bcf1fdac383a8338a58e1761ca"}],"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-2eb8f1bcf1fdac383a8338a58e1761ca","url":"https://github.com/advisories/GHSA-m9gh-vj53-gvh9","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m9gh-vj53-gvh9","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T19:05:53.922Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-2eb8f1bcf1fdac383a8338a58e1761ca"],"technology":"python-engineio","known_exclusions":[],"conditions_summary":"### Impact\nThere are two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take advantage of these to cause unnecessary memory allocations in the python-engineio server. The two cases are:\n\n- POST requests, when using ASGI with the long polling transport\n- WebSocket messages, when using Aiohttp with the WebSocket transport\n\n### Patches\nVersion 4.13.2 addresses this issue as follows:\n\n- ASGI severs now only load the body of incoming requests into memory after the client is confirmed to be known and authenticated, and the payload size is below the maximum allowed size. Requests that do not comply with these requirements are discarded.\n- Aiohttp servers configure the maximum payload size in the underlying WebSocket layer from Aiohttp, so that large messages are discarded by Aiohttp before they are delivered to python-engineio.","public_affected_ranges":["<= 4.13.1"]}],"null_published_at":"2026-11-05T19:10:21.426Z","source_updated_at":"2026-06-26T20:48:19.000Z","source_disclosed_at":"2026-06-26T20:48:18.000Z","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":"2026-11-05T19:05:53.922Z"}],"next_cursor":null,"snapshot_revision":"40769"}