{"id":"CVE-2023-45813","aliases":["GHSA-72qw-p7hh-m3ff","PYSEC-2026-1969"],"url":"https://o3.security/vulnerability/CVE-2023-45813","summary":"Inefficient Regular Expression Complexity in TorBot","details":"Torbot is an open source tor network intelligence tool. In affected versions the `torbot.modules.validators.validate_link function` uses the python-validators URL validation regex. This particular regular expression has an exponential complexity which allows an attacker to cause an application crash using a well-crafted argument. An attacker can use a well-crafted URL argument to exploit the vulnerability in the regular expression and cause a Denial of Service on the system. The validators file has been removed in version 4.0.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.","published":"2023-10-18T20:26:44.531Z","modified":"2026-08-12T03:51:35.731383966Z","cvss":{"score":4.6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00797,"percentile":0.53348,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"PyPI","name":"torbot","fixedVersion":"4.0.0"}],"fix":{"url":"https://github.com/DedSecInside/TorBot/commit/ef6e06bc7785355b1701d5524eb4550441086ac4","label":"DedSecInside/TorBot@ef6e06b"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/45xxx/CVE-2023-45813.json"},{"type":"ADVISORY","url":"https://github.com/DedSecInside/TorBot/security/advisories/GHSA-72qw-p7hh-m3ff"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-45813"},{"type":"FIX","url":"https://github.com/DedSecInside/TorBot/commit/ef6e06bc7785355b1701d5524eb4550441086ac4"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:35.731383966Z"}}