{"items":[{"id":"NVI-00016022","kind":"vulnerability","title":"pyasn1: Uncontrolled resource consumption when converting decoded REAL values","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-hm4w-wwcw-mr6r","CVE-2026-59886"],"plain_summary":"GitHub lists this reviewed advisory for pyasn1. 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-06fc50bea980434ade1593f373f37e79"],"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":"2026-07-21T19:11:22.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-06fc50bea980434ade1593f373f37e79"}],"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-06fc50bea980434ade1593f373f37e79","url":"https://github.com/advisories/GHSA-hm4w-wwcw-mr6r","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-hm4w-wwcw-mr6r","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:34:39.734Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-06fc50bea980434ade1593f373f37e79"],"technology":"pyasn1","known_exclusions":[],"conditions_summary":"### Impact\nThe univ.Real type converted its (mantissa, base, exponent) value to a Python float using exact big-integer exponentiation. A BER/CER/DER-encoded REAL value only a few bytes long can carry a very large exponent, causing this computation to attempt to materialize an astronomically large integer.\n\nAny operation that triggers float conversion on such a decoded value — prettyPrint(), str(), comparison, arithmetic, or an explicit float() call — consumes excessive CPU and memory, hanging the process. Applications that decode untrusted ASN.1 data and then print, log, or compare the decoded objects are vulnerable to denial of service. Decoding alone does not trigger the issue.\n\n### Affected components\n- pyasn1.type.univ.Real — float conversion (__float__() and everything built on it: prettyPrint(), str(), comparisons, arithmetic, int())\n- Reachable through the pyasn1.codec.ber, cer, and der decoders, which produce Real objects from untrusted input; also via directly constructed Real values\n\nThe encoders and the native codec are not affected. Applications that never handle ASN.1 REAL values are not affected.\n\n### Patches\nFixed in pyasn1 0.6.4. Binary (base-2) values are now conve","public_affected_ranges":["<= 0.6.3"]}],"null_published_at":"2026-11-04T10:04:27.865Z","source_updated_at":"2026-07-21T19:11:22.000Z","source_disclosed_at":"2026-07-21T19:11:20.000Z","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":"2026-11-03T22:34:39.734Z"}],"next_cursor":null,"snapshot_revision":"42594"}