https://vulnerability.circl.lu/sightings/feed 2026-09-15T09:58:07.974594+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent sightings. https://vulnerability.circl.lu/sighting/446440f5-0044-411b-8216-9f1b51aa4efd/export 2026-09-15T09:58:08.002850+00:00 Automation user https://vulnerability.circl.lu/user/automation {"uuid": "446440f5-0044-411b-8216-9f1b51aa4efd", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-61534", "type": "seen", "source": "https://bsky.app/profile/stemshop.bsky.social/post/3mvipcssrur24", "content": "\ud83d\udea8 CVE-2026-61534 \u2014 CVSS 9.1 CRITICAL\n\nYayson is a library for serializing and reading JSON API data in JavaScript. Prior to 4.3.0, Store and Lega...\n\n\ud83d\udd0e https://stemshop.top/cve/CVE-2026-61534\n\n#CVE #CyberSecurity #InfoSec", "creation_timestamp": "2026-09-14T18:08:19.426981Z"} 2026-09-14T18:08:19.426981+00:00 https://vulnerability.circl.lu/sighting/310fa769-b1a1-43fd-a81b-ef66c07e90c7/export 2026-09-15T09:58:08.005016+00:00 Automation user https://vulnerability.circl.lu/user/automation {"uuid": "310fa769-b1a1-43fd-a81b-ef66c07e90c7", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-61534", "type": "seen", "source": "https://gist.github.com/alon710/880dc77a6d2d63a35f137e7b084bf95b", "content": "# CVE-2026-61534: CVE-2026-61534: Prototype Pollution in confetti yayson JSON:API Deserialization Engine\n\n> **CVSS Score:** 9.1\n> **Published:** 2026-09-11\n> **Full Report:** https://cvereports.com/reports/CVE-2026-61534\n\n## Summary\nA critical prototype pollution vulnerability was discovered in the confetti yayson library prior to version 4.3.0. The library deserializes JSON:API structures into internal cache dictionaries mapped with standard JavaScript objects. An attacker can control the cache keys by supplying '__proto__' in properties like type or id, modifying the prototype of all JavaScript objects process-wide.\n\n## TL;DR\nUnauthenticated remote prototype pollution in confetti yayson allows process-wide logic corruption, Denial of Service, or Remote Code Execution via structured JSON:API documents.\n\n## Exploit Status: POC\n\n## Technical Details\n\n- **CWE ID**: CWE-1321\n- **Attack Vector**: Network (AV:N)\n- **CVSS Score**: 9.1 (Critical)\n- **Exploit Status**: Proof of Concept (PoC) Available\n- **CISA KEV Status**: Not Listed\n- **Impact**: Integrity and Availability (High)\n\n## Affected Systems\n\n- Applications running Node.js or browser environments deserializing JSON:API payloads with yayson versions <= 4.2.0\n- **yayson**: <= 4.2.0 (Fixed in: `4.3.0`)\n\n## Mitigation\n\n- Upgrade confetti yayson package to version 4.3.0 or higher.\n- Run Node.js process with --disable-proto=throw or --disable-proto=delete.\n- Sanitize incoming client payloads at the gateway or middleware layer to drop __proto__, constructor, and prototype keys.\n\n**Remediation Steps:**\n1. Identify all Node.js applications referencing yayson in package.json.\n2. Run npm install yayson@4.3.0 or yarn add yayson@4.3.0.\n3. Deploy perimeter validation rules to screen incoming application/vnd.api+json requests.\n4. Restart running application services with the V8 protection flag node --disable-proto=throw.\n\n## References\n\n- [Official GitHub Security Advisory](https://github.com/confetti/yayson/security/advisories/GHSA-325j-mg25-8q58)\n- [Fix Pull Request](https://github.com/confetti/yayson/pull/111)\n- [Fix Patch Commit](https://github.com/confetti/yayson/commit/e460162d5a3ebac86424bead7424957c36f8dff9)\n- [Release v4.3.0 Tag](https://github.com/confetti/yayson/releases/tag/v4.3.0)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-61534) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-09-14T16:32:16.944218Z"} 2026-09-14T16:32:16.944218+00:00 https://vulnerability.circl.lu/sighting/cb9c3d1c-6cbc-449b-b678-d8680d5d5723/export 2026-09-15T09:58:08.005191+00:00 Joseph Lee https://vulnerability.circl.lu/user/syspect {"uuid": "cb9c3d1c-6cbc-449b-b678-d8680d5d5723", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2026-61534", "type": "published-proof-of-concept", "source": "https://github.com/confetti/yayson/security/advisories/GHSA-325j-mg25-8q58", "content": "", "creation_timestamp": "2026-09-12T00:35:03.612108Z"} 2026-09-12T00:35:03.612108+00:00 https://vulnerability.circl.lu/sighting/e5dfc866-62b6-4609-8f90-8b0b9f4facae/export 2026-09-15T09:58:08.006683+00:00 Automation user https://vulnerability.circl.lu/user/automation {"uuid": "e5dfc866-62b6-4609-8f90-8b0b9f4facae", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-61534", "type": "seen", "source": "https://bsky.app/profile/termsofsurrender.bsky.social/post/3mvbruf6yp32g", "content": "Prototype pollution sails through while Prague waits for the memo\nPANIC 64% | Lag 0.0h | CVE-2026-61534 in yayson up to 4.2.0 lets a crafted JSON document overwrite the shared base template\n#AfterShockIndex\nREAD MORE", "creation_timestamp": "2026-09-12T00:05:18.061998Z"} 2026-09-12T00:05:18.061998+00:00 https://vulnerability.circl.lu/sighting/c45ef911-f3b9-4b6e-bf0b-6ebde40a4936/export 2026-09-15T09:58:08.006900+00:00 Automation user https://vulnerability.circl.lu/user/automation {"uuid": "c45ef911-f3b9-4b6e-bf0b-6ebde40a4936", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-61534", "type": "seen", "source": "https://bsky.app/profile/stackflag.bsky.social/post/3mvbno2ezrf25", "content": "CVE-2026-61534 - yayson\nThe yayson data library versions up to 4.2.0 accept JSON input that can overwrite the basic template used for every object in the program. By sending a specially crafted document, an\u2026\n\nToo many irrelevant or confusing CVEs? Use stackflag.com\n\n#yayson #jede #npm #CVE #infosec", "creation_timestamp": "2026-09-11T22:50:09.880865Z"} 2026-09-11T22:50:09.880865+00:00