{"id":"CVE-2024-1681","aliases":["GHSA-84pr-m4jr-85g5","PYSEC-2024-271"],"title":"flask-cors vulnerable to log injection when the log level is set to debug","summary":"flask-cors vulnerable to log injection when the log level is set to debug","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","vendor":"flask-cors","product":"flask-cors","ecosystem":"pip","affected":["flask-cors < 4.0.1"],"patched":["flask-cors 4.0.1"],"published":"2024-04-19","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:12.410188532Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-84pr-m4jr-85g5","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-1681"},{"url":"https://github.com/corydolphin/flask-cors"},{"url":"https://github.com/corydolphin/flask-cors/blob/40acc8092332dfed4bb54d7a4f89a6d479466de7/flask_cors/extension.py#L194"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/flask-cors/PYSEC-2024-271.yaml"},{"url":"https://huntr.com/bounties/25a7a0ba-9fa2-4777-acb6-03e5539bb644"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html"}],"tags":["osv","pip"],"epss":0.00579,"epssPercentile":0.46366,"ingestedAt":"2026-09-12T03:13:01.675Z","slug":"CVE-2024-1681","body":"## Overview\n\ncorydolphin/flask-cors is vulnerable to log injection when the log level is set to debug. An attacker can inject fake log entries into the log file by sending a specially crafted GET request containing a CRLF sequence in the request path. This vulnerability allows attackers to corrupt log files, potentially covering tracks of other attacks, confusing log post-processing tools, and forging log entries. The issue is due to improper output neutralization for logs.\n\n## Affected packages\n\n- `flask-cors < 4.0.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `flask-cors 4.0.1`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}