CVE-2026-64847

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{"bugzilla": {"description": "anyio: AnyIO: Denial of Service due to undrained stderr in process-pool workers", "id": "2538074", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538074"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1322", "details": ["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.", "A flaw was found in AnyIO. Untrusted or faulty worker code can write a large amount of data to the standard error (stderr) stream. This data fills a pipe that the parent process fails to drain, causing the process-pool call to block indefinitely. This can lead to a Denial of Service (DoS) condition, making the application unresponsive."], "name": "CVE-2026-64847", "package_state": [{"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Fix deferred", "package_name": "agent-sandbox/agent-sandbox-router", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Out of support scope", "package_name": "exploit-intelligence/vulnerability-analysis-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/lightspeed-stack-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/rag-tool-cpu-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/rag-tool-cuda-12.9-rhel9", "product_name": 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"package_name": "satellite/iop-vmaas-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vulnerability-engine-rhel9", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-09-18T17:04:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64847\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64847\nhttps://github.com/agronholm/anyio/commit/f1b7301c8264b0d2e8d24a5788fd29e93dea4040\nhttps://github.com/agronholm/anyio/pull/1207\nhttps://github.com/agronholm/anyio/releases/tag/4.14.2\nhttps://github.com/agronholm/anyio/security/advisories/GHSA-5p39-cfhj-2xmp"], "threat_severity": "Moderate"}

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