{"items":[{"id":"NVI-00013208","kind":"vulnerability","title":"CyberChef: Prototype pollution in Series Chart operation","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-fx6f-382r-j72c","CVE-2026-57439"],"plain_summary":"GitHub lists this reviewed advisory for cyberchef. 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-18b9dda74fdba94916aeb0e90ce04db3"],"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":"2026-09-24T19:24:31.000Z","value":"5 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-91ecd1d76a45c35462db5b36ab6cc460"},{"kind":"EPSS","as_of":"2026-11-04T12:03:12.000Z","value":"0.135%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.02972. Missing scores are unknown.","source_id":"sr-18b9dda74fdba94916aeb0e90ce04db3"}],"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-91ecd1d76a45c35462db5b36ab6cc460","url":"https://github.com/advisories/GHSA-fx6f-382r-j72c","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-fx6f-382r-j72c","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:52.155Z"},{"id":"sr-18b9dda74fdba94916aeb0e90ce04db3","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-57439","publisher":"FIRST EPSS","observed_at":"2026-11-04T23:33:33.053Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-91ecd1d76a45c35462db5b36ab6cc460"],"technology":"cyberchef","known_exclusions":[],"conditions_summary":"On 5 June 2026 CyberChef received a security vulnerability report from @hyuunnn detailing a vulnerability in the Series Chart operation, where malicious input could result in prototype pollution of the data structures outputted from the operation.\nOther operations following Series Chart could have their behaviour manipulated by the attacker-controlled prototype, for example, injecting malicious content into their HTML output.\n\nIn this case, a demonstration was provided that chained the Series Chart operation with the Parse UDP operation to cause attacker controlled JavaScript to be executed.\n\n## Details\nWhen the Series Chart operation parses user-supplied CSV, it accepts `__proto__` as a key and uses it to pollute the object.\nThe objToTbale function in src/core/lib/Protocol.mjs, used in a number of IP parsing operations, renders data items within `` tags without escaping.\nThese bugs can be chained to produce an XSS vulnerability.\n\n**Proof of Concept**\n[https://gchq.github.io/CyberChef/#recipe=Series_chart('CRLF','Comma','',1,'')Parse_UDP('Raw')&input=X19wcm90b19fLDxpbWcgc3JjPXggb25lcnJvcj1hbGVydChkb2N1bWVudC5kb21haW4pPiwx](https://gchq.github.io/CyberChef/#recipe=Series_chart('","public_affected_ranges":["< 11.2.0"]}],"null_published_at":"2026-11-08T19:53:38.944Z","source_updated_at":"2026-09-24T19:24:31.000Z","source_disclosed_at":"2026-09-24T19:24:30.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-01T07:24:52.155Z"},{"id":"NVI-00013208","kind":"vulnerability","title":"CyberChef: Prototype pollution in Series Chart operation","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-fx6f-382r-j72c","CVE-2026-57439"],"plain_summary":"GitHub lists this reviewed advisory for cyberchef. 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-91ecd1d76a45c35462db5b36ab6cc460"],"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":"2026-09-24T19:24:31.000Z","value":"5 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-91ecd1d76a45c35462db5b36ab6cc460"}],"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-91ecd1d76a45c35462db5b36ab6cc460","url":"https://github.com/advisories/GHSA-fx6f-382r-j72c","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-fx6f-382r-j72c","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:52.155Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-91ecd1d76a45c35462db5b36ab6cc460"],"technology":"cyberchef","known_exclusions":[],"conditions_summary":"On 5 June 2026 CyberChef received a security vulnerability report from @hyuunnn detailing a vulnerability in the Series Chart operation, where malicious input could result in prototype pollution of the data structures outputted from the operation.\nOther operations following Series Chart could have their behaviour manipulated by the attacker-controlled prototype, for example, injecting malicious content into their HTML output.\n\nIn this case, a demonstration was provided that chained the Series Chart operation with the Parse UDP operation to cause attacker controlled JavaScript to be executed.\n\n## Details\nWhen the Series Chart operation parses user-supplied CSV, it accepts `__proto__` as a key and uses it to pollute the object.\nThe objToTbale function in src/core/lib/Protocol.mjs, used in a number of IP parsing operations, renders data items within `` tags without escaping.\nThese bugs can be chained to produce an XSS vulnerability.\n\n**Proof of Concept**\n[https://gchq.github.io/CyberChef/#recipe=Series_chart('CRLF','Comma','',1,'')Parse_UDP('Raw')&input=X19wcm90b19fLDxpbWcgc3JjPXggb25lcnJvcj1hbGVydChkb2N1bWVudC5kb21haW4pPiwx](https://gchq.github.io/CyberChef/#recipe=Series_chart('","public_affected_ranges":["< 11.2.0"]}],"null_published_at":"2026-11-01T07:29:12.929Z","source_updated_at":"2026-09-24T19:24:31.000Z","source_disclosed_at":"2026-09-24T19:24:30.000Z","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":"2026-11-01T07:24:52.155Z"}],"next_cursor":null,"snapshot_revision":"42594"}