{"id":"CVE-2026-97054","aliases":["DEBIAN-CVE-2026-97054","EUVD-2026-123113","GHSA-rg98-f588-44xg","GO-2026-6859","UBUNTU-CVE-2026-97054","openSUSE-SU-2026:12529-1"],"status":"published","title":"HTTP/1 server crash due to MaxBytesReader header race in net/http","description":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.","epss":{"day":"2026-11-12","score":0.00171,"percentile":0.0656,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2026-11-11T00:00:00Z","modified":"2026-11-12T23:49:16Z","fixes":[{"ecosystem":"Go","package":"stdlib","fixed_in":["1.26.11","1.27.4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"golang-1.19","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.19.10-1","1.19.10-2","1.19.11-1","1.19.12-1","1.19.12-2","1.19.12-2~bpo11+1","1.19.12-2~bpo12+1","1.19.13-1","1.19.13-1~bpo11+1","1.19.13-1~bpo12+1","1.19.8-2","1.19.9-1"]},{"source":"osv","ecosystem":"Debian:13","package":"golang-1.24","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.24.12-1","1.24.13-1","1.24.13-2","1.24.4-1","1.24.4-2","1.24.4-3","1.24.4-4","1.24.7-1","1.24.8-1","1.24.9-1"]},{"source":"osv","ecosystem":"Debian:14","package":"golang-1.26","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.26.0-1","1.26.1-1","1.26.10-1","1.26.10-1~bpo13+1","1.26.11-1","1.26.2-1","1.26.2-2","1.26.2-3","1.26.3-1","1.26.3-1~bpo13+1","1.26.3-2","1.26.3-2~bpo13+1","1.26.4-1","1.26.4-1~bpo13+1","1.26.5-1","1.26.5-1~bpo13+1","1.26.6-1","1.26.6-2","1.26.7-1","1.26.7-1~bpo13+1","1.26.8-1","1.26.8-1~bpo13+1","1.26.8-2","1.26.9-1","1.26.9-1~bpo13+1","1.26~rc2-1","1.26~rc3-1","1.26~rc3-2"]},{"source":"osv","ecosystem":"Debian:14","package":"golang-1.27","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.27.0-1","1.27.0-1~bpo13+1","1.27.1-1","1.27.1-2","1.27.1-2~bpo13+1","1.27.2-1","1.27.2-1~bpo13+1","1.27.2-1~bpo13+2","1.27.3-1","1.27.3-1~bpo13+1","1.27.4-1","1.27~rc1-1","1.27~rc2-1","1.27~rc3-1"]},{"source":"osv","ecosystem":"Go","package":"stdlib","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.26.11"},{"introduced":"1.27.0-0"},{"fixed":"1.27.4"}]}]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"golang-1.10","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.4-2ubuntu1~14.04.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"golang-1.10","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.4-2ubuntu1~16.04.1","1.10.4-2ubuntu1~16.04.2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"golang-1.6","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6-0ubuntu1","1.6-0ubuntu2","1.6-0ubuntu3","1.6-0ubuntu4","1.6-0ubuntu5","1.6.1-0ubuntu1","1.6.2-0ubuntu5~16.04","1.6.2-0ubuntu5~16.04.2","1.6.2-0ubuntu5~16.04.3","1.6.2-0ubuntu5~16.04.4"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"golang-1.13","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.8-1ubuntu1~16.04.2","1.13.8-1ubuntu1~16.04.3","1.13.8-1ubuntu1~16.04.3+esm2","1.13.8-1ubuntu1~16.04.3+esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"golang-1.18","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.1-1ubuntu1~16.04.6","1.18.1-1ubuntu1~16.04.6+esm1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"golang-1.10","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10~rc1-1","1.10~rc1-1ubuntu1","1.10~rc1-2ubuntu1","1.10~rc2-1ubuntu1","1.10-1ubuntu1","1.10.1-1ubuntu2","1.10.4-2ubuntu1~18.04.1","1.10.4-2ubuntu1~18.04.2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"golang-1.13","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.8-1ubuntu1~18.04.2","1.13.8-1ubuntu1~18.04.3","1.13.8-1ubuntu1~18.04.4","1.13.8-1ubuntu1~18.04.4+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"golang-1.16","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16.2-0ubuntu1~18.04.2","1.16.2-0ubuntu1~18.04.2+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"golang-1.18","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.1-1ubuntu1~18.04.3","1.18.1-1ubuntu1~18.04.4","1.18.1-1ubuntu1~18.04.4+esm1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"golang-1.8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-2ubuntu1","1.8.3-2ubuntu1.18.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"golang-1.9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.1-2ubuntu1","1.9.2-1ubuntu1","1.9.2-3ubuntu1","1.9.3-1ubuntu1","1.9.4-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"golang-1.13","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.1-1ubuntu1","1.13.3-1ubuntu1","1.13.4-1ubuntu1","1.13.5-1ubuntu1","1.13.6-1ubuntu1","1.13.6-2ubuntu1","1.13.7-1ubuntu1","1.13.8-1ubuntu1","1.13.8-1ubuntu1.1","1.13.8-1ubuntu1.2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"golang-1.14","ranges":[{"type":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standard library","product":"net/http"}],"references":[{"url":"https://go.dev/cl/862185","tags":["fix","report"]},{"url":"https://go.dev/issue/82563","tags":["report"]},{"url":"https://groups.google.com/g/golang-announce/c/iY8TY0wWgbM","tags":["web","report"]},{"url":"https://pkg.go.dev/vuln/GO-2026-6859","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97054"},{"url":"https://github.com/advisories/GHSA-rg98-f588-44xg"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-97054","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-97054","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97054","tags":["report"]},{"url":"https://groups.google.com/g/golang-announce/c/iY8TY0wWgbM/m/KsU1KfWgAQAJ","tags":["report"]},{"url":"https://github.com/golang/go/issues/82563","tags":["report"]},{"url":"https://github.com/golang/go/commit/4c1752a033aef1a66eadfb11363ff256f8daf47d","tags":["report"]},{"url":"https://github.com/golang/go/commit/0e6d155b1a4d2a994c7d906ce069949e17f4b8b8","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97033","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97034","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97035","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97036","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97037","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97038","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97039","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97040","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97041","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97042","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97043","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-97054","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-97054","title":"HTTP/1 server crash due to MaxBytesReader header race in net/http","description":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.","status":"published","published":"2026-11-11T03:13:17.877Z","modified":"2026-11-11T03:13:17.877Z","updated_at":"2026-11-11T04:22:54.647883Z"}],"euvd":[{"id":"EUVD-2026-123113","description":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.","status":"published","published":"2026-11-11T03:13:17Z","modified":"2026-11-11T03:13:17Z","updated_at":"2026-11-11T08:27:52.334831Z"}],"ghsa":[{"id":"GHSA-rg98-f588-44xg","title":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is...","description":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.","status":"published","published":"2026-11-11T06:32:39Z","modified":"2026-11-11T06:32:48Z","updated_at":"2026-11-11T07:02:43.25695Z"}],"nvd":[{"id":"CVE-2026-97054","description":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.","status":"published","published":"2026-11-11T05:19:58.943Z","modified":"2026-11-12T22:09:39.233Z","updated_at":"2026-11-11T07:23:51.781546Z"}],"osv":[{"id":"DEBIAN-CVE-2026-97054","description":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.","status":"published","published":"2026-11-11T05:19:58.943Z","modified":"2026-11-11T07:47:44.694038239Z","updated_at":"2026-11-11T08:27:16.400656Z"},{"id":"GO-2026-6859","title":"HTTP/1 server crash due to MaxBytesReader header race in net/http","description":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.","status":"published","published":"2026-11-11T02:51:11Z","modified":"2026-11-11T03:15:14.805898236Z","updated_at":"2026-11-11T03:52:51.074362Z"},{"id":"openSUSE-SU-2026:12529-1","title":"go1.26-1.26.11-1.1 on GA media","description":"These are all security issues fixed in the go1.26-1.26.11-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-11T00:00:00Z","modified":"2026-11-12T17:23:23.015967912Z","updated_at":"2026-11-12T18:02:05.26944Z"},{"id":"UBUNTU-CVE-2026-97054","description":"For HTTP/1 servers, when MaxBytesReader's limit is exceeded, \"Connection: close\" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.","status":"published","published":"2026-11-12T00:00:00Z","modified":"2026-11-12T23:49:16.395892871Z","updated_at":"2026-11-13T00:21:57.299957Z"}]}}