{"id":"CVE-2026-64847","aliases":["CLSA-2026-1790063936","DEBIAN-CVE-2026-64847","EUVD-2026-83193","GHSA-5p39-cfhj-2xmp","PYSEC-2026-4024","SUSE-SU-2026:24122-1","SUSE-SU-2026:24208-1","SUSE-SU-2026:4416-1","UBUNTU-CVE-2026-64847","openSUSE-SU-2026:22060-1"],"status":"published","title":"AnyIO process-pool workers can block indefinitely on undrained stderr","description":"AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.","severity":{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00157,"percentile":0.04861,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2026-09-18T17:04:32Z","modified":"2026-10-28T02:30:57Z","fixes":[{"ecosystem":"PyPI","package":"anyio","fixed_in":["4.14.2"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"python-anyio","fixed_in":["4.15.1-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.2"}]}]},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.7.1"},{"fixed":"3.7.1.post2+tuxcare"}]}],"versions":["3.7.1","3.7.1.post1+tuxcare"],"bundled":2},{"source":"osv","ecosystem":"Debian:12","package":"python-anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.2-1","3.7.0-1","4.1.0-1","4.11.0-1","4.11.0-2","4.11.0-3","4.12.1-1","4.12.1-2","4.12.1-3","4.15.1-1","4.15.1-2","4.15.1-3","4.2.0-1","4.3.0-1","4.4.0-1","4.6.0-1","4.6.2-1","4.6.2-2","4.6.2-3","4.6.2-4","4.7.0-1","4.8.0-1","4.8.0-2","4.8.0-3"]},{"source":"osv","ecosystem":"Debian:13","package":"python-anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.0-1","4.11.0-2","4.11.0-3","4.12.1-1","4.12.1-2","4.12.1-3","4.15.1-1","4.15.1-2","4.15.1-3","4.8.0-3"]},{"source":"osv","ecosystem":"Debian:14","package":"python-anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.1-1"}]}],"versions":["4.11.0-1","4.11.0-2","4.11.0-3","4.12.1-1","4.12.1-2","4.12.1-3","4.8.0-3"]},{"source":"osv","ecosystem":"PyPI","package":"anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.2"}]}],"versions":["1.0.0","1.0.0a1","1.0.0a2","1.0.0b1","1.0.0b2","1.0.0rc1","1.0.0rc2","1.1.0","1.2.0","1.2.1","1.2.2","1.2.3","1.3.0","1.3.1","1.4.0","2.0.0","2.0.0b1","2.0.0b2","2.0.0rc1","2.0.0rc2","2.0.1","2.0.2","2.1.0","2.2.0","3.0.0","3.0.0rc1","3.0.0rc2","3.0.0rc3","3.0.0rc4","3.0.1","3.1.0","3.2.0","3.2.1","3.3.0","3.3.1","3.3.2","3.3.3","3.3.4","3.4.0","3.5.0","3.6.0","3.6.1","3.6.2","3.7.0","3.7.0rc1","3.7.1","4.0.0","4.0.0rc1","4.1.0","4.10.0","4.11.0","4.12.0","4.12.1","4.13.0","4.14.0","4.14.1","4.2.0","4.3.0","4.4.0","4.5.0","4.5.1","4.5.2","4.6.0","4.6.1","4.6.2","4.6.2.post1","4.7.0","4.8.0","4.9.0"]},{"source":"osv","ecosystem":"PyPI","package":"anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.2"}]}],"versions":["1.0.0","1.0.0a1","1.0.0a2","1.0.0b1","1.0.0b2","1.0.0rc1","1.0.0rc2","1.1.0","1.2.0","1.2.1","1.2.2","1.2.3","1.3.0","1.3.1","1.4.0","2.0.0","2.0.0b1","2.0.0b2","2.0.0rc1","2.0.0rc2","2.0.1","2.0.2","2.1.0","2.2.0","3.0.0","3.0.0rc1","3.0.0rc2","3.0.0rc3","3.0.0rc4","3.0.1","3.1.0","3.2.0","3.2.1","3.3.0","3.3.1","3.3.2","3.3.3","3.3.4","3.4.0","3.5.0","3.6.0","3.6.1","3.6.2","3.7.0","3.7.0rc1","3.7.1","4.0.0","4.0.0rc1","4.1.0","4.10.0","4.11.0","4.12.0","4.12.1","4.13.0","4.14.0","4.14.1","4.2.0","4.3.0","4.4.0","4.5.0","4.5.1","4.5.2","4.6.0","4.6.1","4.6.2","4.6.2.post1","4.7.0","4.8.0","4.9.0"]},{"source":"osv","ecosystem":"SUSE:Linux 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SP5-LTSS","package":"python-anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.0-150400.9.11.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","package":"python-anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.0-150400.9.11.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP4","package":"python-anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.0-150400.9.11.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","package":"python-anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.0-150400.9.11.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 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16.0","package":"python-anyio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.0-160000.3.1"}]}],"bundled":2}],"products":[{"vendor":"agronholm","product":"anyio"}],"references":[{"url":"https://github.com/agronholm/anyio/security/advisories/GHSA-5p39-cfhj-2xmp","tags":["x_refsource_CONFIRM","advisory","web","report"]},{"url":"https://github.com/agronholm/anyio/pull/1207","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/agronholm/anyio/commit/f1b7301c8264b0d2e8d24a5788fd29e93dea4040","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/agronholm/anyio/releases/tag/4.14.2","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/advisories/GHSA-5p39-cfhj-2xmp","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64847.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64847","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-64847","tags":["advisory"]},{"url":"https://github.com/agronholm/anyio","tags":["package"]},{"url":"https://pypi.org/project/anyio","tags":["package"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624122-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1281475","tags":["report"]},{"url":"https://bugzilla.suse.com/1281476","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63374","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-64847","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624208-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264416-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-64847","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64847","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-64847","title":"AnyIO process-pool workers can block indefinitely on undrained stderr","description":"AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.","status":"published","published":"2026-09-18T17:04:32.038Z","modified":"2026-09-18T18:07:27.772Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:19:57.818032Z"}],"euvd":[{"id":"EUVD-2026-83193","description":"AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.","status":"published","published":"2026-09-18T17:04:32Z","modified":"2026-09-18T18:07:27Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T17:28:07.943492Z"}],"ghsa":[{"id":"GHSA-5p39-cfhj-2xmp","title":"AnyIO process-pool workers can block indefinitely on undrained stderr","description":"### Impact\nAnyIO starts process-pool workers with stderr connected to a pipe but never drains that pipe. The worker redirects stdin and stdout to /dev/null to protect its protocol, but does not redirect stderr even though the documentation says all three standard streams are redirected. Worker code that writes enough attacker-influenced data to stderr can fill the pipe, block before returning the stdout protocol response, and wedge the awaiting process-pool call.\n\nAnyone who runs untrusted or faulty code that writes too much to `stderr` is at risk.\n\n### Patches\nThis vulnerability will be patched in v4.14.2.\n\n### Workarounds\nClosing `sys.stderr` in the target function should at least prevent the deadlock.","status":"published","published":"2026-09-18T17:17:10Z","modified":"2026-09-18T17:17:14Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:41:19.455935Z"}],"nvd":[{"id":"CVE-2026-64847","description":"AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.","status":"published","published":"2026-09-18T18:17:10.93Z","modified":"2026-09-24T21:25:27.05Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:12:50.043898Z"}],"osv":[{"id":"CVE-2026-64847","title":"AnyIO process-pool workers can block indefinitely on undrained stderr","description":"AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.","status":"published","published":"2026-09-18T17:04:32.038Z","modified":"2026-11-11T02:49:06.269700692Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-11T03:21:18.82478Z"},{"id":"DEBIAN-CVE-2026-64847","description":"AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.","status":"published","published":"2026-09-18T18:17:10.93Z","modified":"2026-10-06T06:00:06.65101384Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-02T15:45:58.699079Z"},{"id":"GHSA-5p39-cfhj-2xmp","title":"AnyIO process-pool workers can block indefinitely on undrained stderr","description":"### Impact\nAnyIO starts process-pool workers with stderr connected to a pipe but never drains that pipe. The worker redirects stdin and stdout to /dev/null to protect its protocol, but does not redirect stderr even though the documentation says all three standard streams are redirected. Worker code that writes enough attacker-influenced data to stderr can fill the pipe, block before returning the stdout protocol response, and wedge the awaiting process-pool call.\n\nAnyone who runs untrusted or faulty code that writes too much to `stderr` is at risk.\n\n### Patches\nThis vulnerability will be patched in v4.14.2.\n\n### Workarounds\nClosing `sys.stderr` in the target function should at least prevent the deadlock.","status":"published","published":"2026-09-18T17:17:10Z","modified":"2026-10-01T17:55:57.336188727Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:46:38.553953Z"},{"id":"PYSEC-2026-4024","title":"AnyIO process-pool workers can block indefinitely on undrained stderr","description":"### Impact\nAnyIO starts process-pool workers with stderr connected to a pipe but never drains that pipe. The worker redirects stdin and stdout to /dev/null to protect its protocol, but does not redirect stderr even though the documentation says all three standard streams are redirected. Worker code that writes enough attacker-influenced data to stderr can fill the pipe, block before returning the stdout protocol response, and wedge the awaiting process-pool call.\n\nAnyone who runs untrusted or faulty code that writes too much to `stderr` is at risk.\n\n### Patches\nThis vulnerability will be patched in v4.14.2.\n\n### Workarounds\nClosing `sys.stderr` in the target function should at least prevent the deadlock.","status":"published","published":"2026-10-01T16:38:33.524594Z","modified":"2026-10-01T17:45:01.995149284Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T15:52:57.255153Z"},{"id":"UBUNTU-CVE-2026-64847","description":"AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.","status":"published","published":"2026-09-18T18:17:00Z","modified":"2026-10-17T13:00:33.675139976Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:56:53.710209Z"},{"id":"CLSA-2026-1790063936","title":"TuxCare security update for anyio (2 CVEs)","description":"TuxCare rebuilt anyio to address 2 CVEs. Fixed in 3.7.1.post2+tuxcare.","status":"published","published":"2026-09-22T07:58:56Z","modified":"2026-10-15T09:48:02.009723726Z","updated_at":"2026-11-02T15:43:48.28229Z"},{"id":"openSUSE-SU-2026:22060-1","title":"Security update for python-anyio","description":"This update for python-anyio fixes the following issues:\n\n- CVE-2026-63374: TLSStream IDNA 2003 host name encoding enables potential TLS certificate spoofing (bsc#1281476).\n- CVE-2026-64847: AnyIO process-pool workers can block indefinitely on undrained stderr (bsc#1281475).\n","status":"published","published":"2026-10-08T10:52:11Z","modified":"2026-10-19T17:23:10.65070471Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:24122-1","title":"Security update for python-anyio","description":"This update for python-anyio fixes the following issues:\n\n- CVE-2026-63374: TLSStream IDNA 2003 host name encoding enables potential TLS certificate spoofing (bsc#1281476).\n- CVE-2026-64847: AnyIO process-pool workers can block indefinitely on undrained stderr (bsc#1281475).\n","status":"published","published":"2026-10-08T10:43:41Z","modified":"2026-10-13T17:23:10.205433402Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:24208-1","title":"Security update for python-anyio","description":"This update for python-anyio fixes the following issues:\n\n- CVE-2026-63374: TLSStream IDNA 2003 host name encoding enables potential TLS certificate spoofing (bsc#1281476).\n- CVE-2026-64847: AnyIO process-pool workers can block indefinitely on undrained stderr (bsc#1281475).\n","status":"published","published":"2026-10-08T10:43:54Z","modified":"2026-10-21T17:23:09.256266469Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:4416-1","title":"Security update for python-anyio","description":"This update for python-anyio fixes the following issues:\n\n- CVE-2026-63374: : TLSStream IDNA 2003 host name encoding enables potential TLS certificate spoofing (bsc#1281476).\n- CVE-2026-64847: AnyIO process-pool workers can block indefinitely on undrained stderr (bsc#1281475).\n","status":"published","published":"2026-10-02T09:18:08Z","modified":"2026-10-02T18:30:38.509005042Z","updated_at":"2026-11-02T15:54:05.838224Z"}]}}