{"action":"Upgrade github.com/dunglas/mercure to 0.22.0 or later.","affected":[{"fixed":"0.22.0","introduced":"0"}],"component":"github.com/dunglas/mercure","cve_ids":["CVE-2026-39972"],"ecosystem":"Go","epss":0.00422,"exploited":false,"fixed_versions":["0.22.0"],"ghsa_id":"GHSA-hwr4-mq23-wcv5","id":"tcs_01M5KGMBGD9K66R50X0YSAMXKD","modified_at":"2026-06-25T23:01:10.139029011Z","published_at":"2026-06-25T22:34:31Z","references":["https://osv.dev/vulnerability/GO-2026-5444","https://github.com/dunglas/mercure/security/advisories/GHSA-hwr4-mq23-wcv5","https://nvd.nist.gov/vuln/detail/CVE-2026-39972","https://github.com/dunglas/mercure/commit/4964a69be904fd61e35b5f1e691271663b6fdd64","https://github.com/dunglas/mercure/releases/tag/v0.22.0"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-5444","url":"https://osv.dev/vulnerability/GO-2026-5444"}],"summary":"mercure has Topic Selector Cache Key Collision in github.com/dunglas/mercure"}