rdiffweb prior to 2.5.0a3 does not validate email length, allowing users to insert an email longer than 255 characters. If a user signs up with an email with a length of 1 million or more characters and logs in, withdraws, or changes their email, the server may cause denial of service due to overload.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-3364
• ikus060/rdiffweb@b62c479
• https://huntr.dev/bounties/e70ad507-1424-463b-bdf1-c4a6fbe6e720
• https://github.com/pypa/advisory-database/tree/main/vulns/rdiffweb/PYSEC-2022-298.yaml