{"id":"PSF-2022-7","summary":"CVE-2021-3737: urllib HTTP client possible infinite loop on a 100 Continue response","details":"A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.","aliases":["BIT-libpython-2021-3737","BIT-python-2021-3737","BIT-python-min-2021-3737","CVE-2021-3737"],"modified":"2026-05-18T05:47:06.020980976Z","published":"2022-03-04T00:00:00Z","database_specific":{"cwe_ids":[]},"references":[{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2021-3737"},{"type":"ADVISORY","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1995162"},{"type":"REPORT","url":"https://bugs.python.org/issue44022"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"078b146f062d212919d0ba25e34e658a8234aa63"},{"fixed":"47895e31b6f626bc6ce47d175fe9d43c1098909d"},{"fixed":"60ba0b68470a584103e28958d91e93a6db37ec92"},{"fixed":"ea9327036680acc92d9f89eaf6f6a54d2f8d78d9"},{"fixed":"f396864ddfe914531b5856d7bf852808ebfc01ae"},{"fixed":"f68d2d69f1da56c2aea1293ecf93ab69a6010ad7"}]}],"versions":["v3.10.0b1","v3.9.5","v3.10.0a7","v3.9.2","v3.8.8","v3.9.2rc1","v3.8.8rc1","v3.6.13","v3.7.10","v3.10.0a1","v3.6.12","v3.7.9","v3.9.0b5","v3.8.5","v3.7.8","v3.6.11","v3.6.11rc1","v3.7.8rc1","v3.9.0b3","v3.9.0b1","v3.8.3","v3.8.3rc1","v3.7.7rc1","v3.9.0a2","v3.6.10","v3.6.10rc1","v3.7.6rc1","v3.8.0rc1","v3.6.9","v3.6.9rc1","v3.7.3rc1","v3.6.8","v3.7.2rc1","v3.6.8rc1","v3.7.0rc1","v3.6.6rc1","v3.7.0b5","v3.7.0b4","v3.7.0b3","v3.7.0b2","v3.7.0b1","v3.7.0a2","v3.6.2rc1","v3.6.0rc1","v3.6.0b4","v3.6.0b3","v3.6.0b1","v3.6.0a3","v3.5.0b1","v3.5.0a4","v3.5.0a3","v3.5.0a2","v3.5.0a1","v3.4.0b3","v3.4.0b2","v3.4.0b1","v3.4.0a4","v3.4.0a3","v3.4.0a2","v3.4.0a1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.3.0b2","v3.3.0b1","v3.3.0a4","v3.3.0a3","v3.3.0a2","v3.2rc3","v3.2rc2","v3.2rc1","v3.2b2","v3.2b1","v3.2a4","v3.2a3","v3.2a2","v3.2a1","v3.1","v3.1rc2","v3.1rc1","v3.1b1","v3.1a2","v3.1a1","v3.0rc3","v3.0rc2","v3.0rc1","v3.0b3","v3.0b2","v3.0b1","v3.0a5","v3.0a4","v3.0a3","v3.0a2","v3.0a1","v2.4","v2.4c1","v2.4b2","v2.4b1","v2.4a3","v2.4a2","v2.4a1","v2.3c2","v2.3c1","v2.2a3","v2.1","v2.1c2","v2.1c1","v2.1b2","v2.1b1","v2.1a2","v2.1a1","v2.0","v2.0c1","v2.0b2","v2.0b1","v1.6a2","v1.6a1","v1.5.2","v1.5.2c1","v1.5.2b2","v1.5.2b1","v1.5.2a2","v1.5.2a1","v1.5.1","v1.5","v1.5b2","v1.5b1","v1.5a4","v1.5a3","v1.5a2","v1.5a1","v1.4","v1.4b3","v1.4b2","v1.4b1","v1.3","v1.3b1","v1.2","v1.2b4","v1.2b3","v1.2b2","v1.2b1","v1.1.1","v1.1","v1.0.2","v1.0.1","v0.9.9","v0.9.8"],"database_specific":{"source":"https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-2022-7.json"}}],"schema_version":"1.7.5"}