{"id":"CVE-2026-116580","aliases":["CLSA-2026-1793699857","EUVD-2026-110242","GHSA-7rv5-mrxv-xcr9"],"status":"published","title":"Seroval: Deserialization invokes attacker-chosen callables: AsyncIteratorFactoryInstance calls source.on(listener) without type check","description":"Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. This issue is fixed in version 1.6.8.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00342,"percentile":0.2807,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-502"],"published":"2026-10-26T20:35:49Z","modified":"2026-11-04T02:30:33Z","exploits":[{"source":"pocgithub","id":"federiconbaez/cortex9-seroval-node-id-type-confusion-model","title":"federiconbaez/cortex9-seroval-node-id-type-confusion-model","date":"2026-11-09","url":"https://github.com/federiconbaez/cortex9-seroval-node-id-type-confusion-model"}],"fixes":[{"ecosystem":"npm","package":"seroval","fixed_in":["1.6.8"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"seroval","fixed_in":["1.5.6-tuxcare.5"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"seroval","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.6.7"},{"fixed":"1.6.8"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"seroval","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.5.6-tuxcare.0"},{"fixed":"1.5.6-tuxcare.5"}]}],"versions":["1.5.6","1.5.6-tuxcare.1","1.5.6-tuxcare.2","1.5.6-tuxcare.3","1.5.6-tuxcare.4"]},{"source":"osv","ecosystem":"npm","package":"seroval","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.6.8"}]}]}],"products":[{"vendor":"lxsmnsyc","product":"seroval"}],"references":[{"url":"https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-7rv5-mrxv-xcr9","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/lxsmnsyc/seroval/commit/3edc78b495ea0d6bd498143e5b3e56996607c5f2","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/lxsmnsyc/seroval/commit/50926b3ee198fb757e6ce3aa70efeed38d931c8d","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116580","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-7rv5-mrxv-xcr9"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116580.json","tags":["advisory"]},{"url":"https://github.com/lxsmnsyc/seroval","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-116580","title":"Seroval: Deserialization invokes attacker-chosen callables: AsyncIteratorFactoryInstance calls source.on(listener) without type check","description":"Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. This issue is fixed in version 1.6.8.","status":"published","published":"2026-10-26T20:35:49.975Z","modified":"2026-11-02T18:11:49.13Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T19:47:06.831391Z"}],"euvd":[{"id":"EUVD-2026-110242","description":"Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. This issue is fixed in version 1.6.8.","status":"published","published":"2026-10-26T20:35:49Z","modified":"2026-11-02T18:11:49Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-03T05:08:39.228431Z"}],"ghsa":[{"id":"GHSA-7rv5-mrxv-xcr9","title":"Seroval: Deserialization invokes attacker-chosen callables: AsyncIteratorFactoryInstance calls source.on(listener) without type check","description":"### Summary\n\nWhen `fromJSON` rebuilt an async iterator, it called `on()` on the iterator's source without checking that the source was a seroval stream. A crafted payload could pick another value as the source, such as a function returned by an application plugin. The deserializer then called that value's `on` method.\n\nThis is a variant of GHSA-mv8w-475r-vwqw. That fix covered the promise and stream control nodes but not the async iterator node.\n\n### Impact\n\nAn application that passes untrusted input to `fromJSON` with plugins that return callable values can have those callables invoked during deserialization. What this allows depends on what the plugin's values do.\n\n### Affected versions\n\n- Versions up to 1.6.3 accept any value as the source.\n- 1.6.4 rejects the reported payload.\n- 1.6.5 to 1.6.7 check the source by node type, which a payload can get around by reusing a node id.\n- All versions up to 1.6.7 should be treated as affected.\n\n### Patches\n\nFixed in `seroval@1.6.8`. Streams and sequences are now internal class instances. The deserializer checks the source value with `instanceof`, so plain data and plugin values are rejected no matter which node id they use.\n\n### Workarounds\n\nAvoid plugins whose `deserialize` returns functions or objects with an `on` method when decoding untrusted input. Upgrading to 1.6.8 is recommended.","status":"published","published":"2026-10-28T21:17:15Z","modified":"2026-10-28T21:17:15Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:41:39.926569Z"}],"nvd":[{"id":"CVE-2026-116580","description":"Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. This issue is fixed in version 1.6.8.","status":"published","published":"2026-10-26T21:18:15.523Z","modified":"2026-11-02T19:17:56.16Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"secondary"}],"cwes":["CWE-502"],"updated_at":"2026-11-03T00:02:36.126212Z"}],"osv":[{"id":"CVE-2026-116580","title":"Seroval: Deserialization invokes attacker-chosen callables: AsyncIteratorFactoryInstance calls source.on(listener) without type check","description":"Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. This issue is fixed in version 1.6.8.","status":"published","published":"2026-10-26T20:35:49.975Z","modified":"2026-11-04T02:30:33.280431843Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-502"],"updated_at":"2026-11-04T02:54:44.889498Z"},{"id":"GHSA-7rv5-mrxv-xcr9","title":"Seroval: Deserialization invokes attacker-chosen callables: AsyncIteratorFactoryInstance calls source.on(listener) without type check","description":"### Summary\n\nWhen `fromJSON` rebuilt an async iterator, it called `on()` on the iterator's source without checking that the source was a seroval stream. A crafted payload could pick another value as the source, such as a function returned by an application plugin. The deserializer then called that value's `on` method.\n\nThis is a variant of GHSA-mv8w-475r-vwqw. That fix covered the promise and stream control nodes but not the async iterator node.\n\n### Impact\n\nAn application that passes untrusted input to `fromJSON` with plugins that return callable values can have those callables invoked during deserialization. What this allows depends on what the plugin's values do.\n\n### Affected versions\n\n- Versions up to 1.6.3 accept any value as the source.\n- 1.6.4 rejects the reported payload.\n- 1.6.5 to 1.6.7 check the source by node type, which a payload can get around by reusing a node id.\n- All versions up to 1.6.7 should be treated as affected.\n\n### Patches\n\nFixed in `seroval@1.6.8`. Streams and sequences are now internal class instances. The deserializer checks the source value with `instanceof`, so plain data and plugin values are rejected no matter which node id they use.\n\n### Workarounds\n\nAvoid plugins whose `deserialize` returns functions or objects with an `on` method when decoding untrusted input. Upgrading to 1.6.8 is recommended.","status":"published","published":"2026-10-28T21:17:15Z","modified":"2026-10-28T21:30:03.899348358Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:46:41.349637Z"},{"id":"CLSA-2026-1793699857","title":"TuxCare security update for seroval (1 CVE)","description":"TuxCare rebuilt seroval to address 1 CVE. Fixed in 1.5.6-tuxcare.5.","status":"published","published":"2026-11-03T10:57:38Z","modified":"2026-11-03T13:30:02.618226077Z","updated_at":"2026-11-03T14:04:50.729288Z"}]}}