{"items":[{"id":"NVI-00010632","kind":"vulnerability","title":"Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport via an Unbounded Subnegotiation Buffer","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cwm5-jh59-mwxr","CVE-2026-115778"],"plain_summary":"GitHub lists this reviewed advisory for Twisted. 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-018ed95c1605e484e725b11634f1a976"],"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":"2026-10-23T20:45:27.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-7a6342b0b2744dc58b3df507e734cff8"},{"kind":"EPSS","as_of":"2026-11-06T12:00:23.000Z","value":"0.540%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.45638. Missing scores are unknown.","source_id":"sr-018ed95c1605e484e725b11634f1a976"}],"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-7a6342b0b2744dc58b3df507e734cff8","url":"https://github.com/advisories/GHSA-cwm5-jh59-mwxr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-cwm5-jh59-mwxr","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:08.657Z"},{"id":"sr-018ed95c1605e484e725b11634f1a976","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-2026-115778","publisher":"FIRST EPSS","observed_at":"2026-11-06T20:58:43.515Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7a6342b0b2744dc58b3df507e734cff8"],"technology":"Twisted","known_exclusions":[],"conditions_summary":"## Summary\n\nAn allocation-without-limits vulnerability (CWE-770) in the Twisted conch telnet transport lets any unauthenticated remote peer exhaust server memory over a single connection. When the peer opens a telnet subnegotiation with `IAC SB` and then streams bytes without ever sending the `IAC SE` terminator, every byte is appended to a per-connection buffer that has no maximum length. The buffer persists across reads and is released only on the terminator the attacker withholds, so it grows without bound until the process is killed.\n\n## Details\n\nThe option-negotiation state machine in `Telnet.dataReceived` enters the `subnegotiation` state on `IAC SB` and sets an empty command list. In that state every non-`IAC` byte is appended to the list with no length check:\n\n```python\n# src/twisted/conch/telnet.py  (Telnet.dataReceived)\nelif self.state == \"subnegotiation\":\n    if b == IAC:\n        self.state = \"subnegotiation-escaped\"\n    else:\n        self.commands.append(b)      # unbounded: no len(self.commands) check\n```\n\n`self.commands` is an instance attribute that persists across `dataReceived` calls and is deleted only when `IAC SE` completes the subnegotiation. Negotiation runs a","public_affected_ranges":["<= 26.4.0"]}],"null_published_at":"2026-11-07T22:29:26.081Z","source_updated_at":"2026-10-23T20:45:27.000Z","source_disclosed_at":"2026-10-23T20:45:26.000Z","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":"2026-10-31T22:07:08.657Z"},{"id":"NVI-00010632","kind":"vulnerability","title":"Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport via an Unbounded Subnegotiation Buffer","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cwm5-jh59-mwxr","CVE-2026-115778"],"plain_summary":"GitHub lists this reviewed advisory for Twisted. 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-0af2bd652c00849b52d198f6c9e78f22"],"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":"2026-10-23T20:45:27.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-7a6342b0b2744dc58b3df507e734cff8"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.540%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.45508. Missing scores are unknown.","source_id":"sr-0af2bd652c00849b52d198f6c9e78f22"}],"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-7a6342b0b2744dc58b3df507e734cff8","url":"https://github.com/advisories/GHSA-cwm5-jh59-mwxr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-cwm5-jh59-mwxr","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:08.657Z"},{"id":"sr-0af2bd652c00849b52d198f6c9e78f22","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-2026-115778","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.776Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7a6342b0b2744dc58b3df507e734cff8"],"technology":"Twisted","known_exclusions":[],"conditions_summary":"## Summary\n\nAn allocation-without-limits vulnerability (CWE-770) in the Twisted conch telnet transport lets any unauthenticated remote peer exhaust server memory over a single connection. When the peer opens a telnet subnegotiation with `IAC SB` and then streams bytes without ever sending the `IAC SE` terminator, every byte is appended to a per-connection buffer that has no maximum length. The buffer persists across reads and is released only on the terminator the attacker withholds, so it grows without bound until the process is killed.\n\n## Details\n\nThe option-negotiation state machine in `Telnet.dataReceived` enters the `subnegotiation` state on `IAC SB` and sets an empty command list. In that state every non-`IAC` byte is appended to the list with no length check:\n\n```python\n# src/twisted/conch/telnet.py  (Telnet.dataReceived)\nelif self.state == \"subnegotiation\":\n    if b == IAC:\n        self.state = \"subnegotiation-escaped\"\n    else:\n        self.commands.append(b)      # unbounded: no len(self.commands) check\n```\n\n`self.commands` is an instance attribute that persists across `dataReceived` calls and is deleted only when `IAC SE` completes the subnegotiation. Negotiation runs a","public_affected_ranges":["<= 26.4.0"]}],"null_published_at":"2026-11-04T10:04:41.582Z","source_updated_at":"2026-10-23T20:45:27.000Z","source_disclosed_at":"2026-10-23T20:45:26.000Z","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":"2026-10-31T22:07:08.657Z"},{"id":"NVI-00010632","kind":"vulnerability","title":"Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport via an Unbounded Subnegotiation Buffer","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cwm5-jh59-mwxr","CVE-2026-115778"],"plain_summary":"GitHub lists this reviewed advisory for Twisted. 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-313326e75495fb31a55f94c9295b00d8"],"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":"2026-10-23T20:45:27.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-7a6342b0b2744dc58b3df507e734cff8"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.540%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.45476. Missing scores are unknown.","source_id":"sr-313326e75495fb31a55f94c9295b00d8"}],"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-7a6342b0b2744dc58b3df507e734cff8","url":"https://github.com/advisories/GHSA-cwm5-jh59-mwxr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-cwm5-jh59-mwxr","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:08.657Z"},{"id":"sr-313326e75495fb31a55f94c9295b00d8","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-2026-115778","publisher":"FIRST EPSS","observed_at":"2026-10-31T23:13:27.689Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7a6342b0b2744dc58b3df507e734cff8"],"technology":"Twisted","known_exclusions":[],"conditions_summary":"## Summary\n\nAn allocation-without-limits vulnerability (CWE-770) in the Twisted conch telnet transport lets any unauthenticated remote peer exhaust server memory over a single connection. When the peer opens a telnet subnegotiation with `IAC SB` and then streams bytes without ever sending the `IAC SE` terminator, every byte is appended to a per-connection buffer that has no maximum length. The buffer persists across reads and is released only on the terminator the attacker withholds, so it grows without bound until the process is killed.\n\n## Details\n\nThe option-negotiation state machine in `Telnet.dataReceived` enters the `subnegotiation` state on `IAC SB` and sets an empty command list. In that state every non-`IAC` byte is appended to the list with no length check:\n\n```python\n# src/twisted/conch/telnet.py  (Telnet.dataReceived)\nelif self.state == \"subnegotiation\":\n    if b == IAC:\n        self.state = \"subnegotiation-escaped\"\n    else:\n        self.commands.append(b)      # unbounded: no len(self.commands) check\n```\n\n`self.commands` is an instance attribute that persists across `dataReceived` calls and is deleted only when `IAC SE` completes the subnegotiation. Negotiation runs a","public_affected_ranges":["<= 26.4.0"]}],"null_published_at":"2026-10-31T23:18:22.443Z","source_updated_at":"2026-10-23T20:45:27.000Z","source_disclosed_at":"2026-10-23T20:45:26.000Z","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":"2026-10-31T22:07:08.657Z"},{"id":"NVI-00010632","kind":"vulnerability","title":"Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport via an Unbounded Subnegotiation Buffer","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cwm5-jh59-mwxr","CVE-2026-115778"],"plain_summary":"GitHub lists this reviewed advisory for Twisted. 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-7a6342b0b2744dc58b3df507e734cff8"],"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":"2026-10-23T20:45:27.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-7a6342b0b2744dc58b3df507e734cff8"}],"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-7a6342b0b2744dc58b3df507e734cff8","url":"https://github.com/advisories/GHSA-cwm5-jh59-mwxr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-cwm5-jh59-mwxr","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:08.657Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7a6342b0b2744dc58b3df507e734cff8"],"technology":"Twisted","known_exclusions":[],"conditions_summary":"## Summary\n\nAn allocation-without-limits vulnerability (CWE-770) in the Twisted conch telnet transport lets any unauthenticated remote peer exhaust server memory over a single connection. When the peer opens a telnet subnegotiation with `IAC SB` and then streams bytes without ever sending the `IAC SE` terminator, every byte is appended to a per-connection buffer that has no maximum length. The buffer persists across reads and is released only on the terminator the attacker withholds, so it grows without bound until the process is killed.\n\n## Details\n\nThe option-negotiation state machine in `Telnet.dataReceived` enters the `subnegotiation` state on `IAC SB` and sets an empty command list. In that state every non-`IAC` byte is appended to the list with no length check:\n\n```python\n# src/twisted/conch/telnet.py  (Telnet.dataReceived)\nelif self.state == \"subnegotiation\":\n    if b == IAC:\n        self.state = \"subnegotiation-escaped\"\n    else:\n        self.commands.append(b)      # unbounded: no len(self.commands) check\n```\n\n`self.commands` is an instance attribute that persists across `dataReceived` calls and is deleted only when `IAC SE` completes the subnegotiation. Negotiation runs a","public_affected_ranges":["<= 26.4.0"]}],"null_published_at":"2026-10-31T22:27:09.626Z","source_updated_at":"2026-10-23T20:45:27.000Z","source_disclosed_at":"2026-10-23T20:45:26.000Z","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":"2026-10-31T22:07:08.657Z"}],"next_cursor":null,"snapshot_revision":"42594"}