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Sean WhalenandClaude Fable 5.1
14aa287dc1
Three regular expressions that run on attacker-controlled input backtracked super-linearly (CWE-1333): GHSA-7grx-mj6g-qxmc (affects 8.2.0 through 11.0.3, reported by mjatin2007): text_report_regex, used by the Exim/cPanel plain-text failure-report fallback, was \s*([a-zA-Z\s]+):\s(.+). The leading \s* and the \s inside the class overlap and the pattern is unanchored, so a whitespace run is retried from every offset and every split: cubic, about 8x per doubling (400 spaces 0.06 s, 1600 spaces 3.3 s on CPython 3.12). A ~100 KB message would stall the watch loop for days and be re-parsed after every restart. The pattern is now anchored to a line start with disjoint classes. GHSA-4h9r-c435-j834 (affects 4.1.7 through 11.0.3, found while auditing every regex in the package): xml_schema_regex was </??xs:schema.*>, whose greedy .*> rescans to end of line for every <xs:schema occurrence: quadratic, 1 MB in 19 s. It runs on every attachment that decodes to "<" after extract_report() has inflated it up to the 100 MiB cap, which 194 KB of gzip reaches. Now </?xs:schema[^<>]*>. This also fixes the greedy match deleting a minified single-line report from the schema tag to the last ">" on the line. human_timestamp_to_datetime() stripped RFC 5322 comments with \s*\(.*\)\s*, quadratic on whitespace (200,000 spaces 18.6 s) and reached through every Date header; filed as a bug fix because MTAs cap header size. Comments are now removed by a depth-counting scan, which is linear and handles the nested comments and quoted-pairs RFC 5322 section 3.2.2 allows (a character-class regex would have regressed them). Adds regression tests sized so the old patterns fail the time bound in minutes rather than hanging CI, a "Regular expressions on untrusted input" section in AGENTS.md, and the 11.0.4 changelog and version bump. Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
parsedmarc
parsedmarc is a Python module and CLI utility for parsing DMARC
reports. When used with Elasticsearch and Kibana (or Splunk), or with
OpenSearch and Grafana, it works as a self-hosted open-source
alternative to commercial DMARC report processing services such as
Agari Brand Protection, Dmarcian, OnDMARC, ProofPoint Email Fraud
Defense, and Valimail.
Note
Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an email authentication protocol.
Sponsors
This project is maintained by one developer. Please consider sponsoring my work if you or your organization benefit from it.
Features
- Parses aggregate/rua DMARC reports: the legacy draft and 1.0 schemas (RFC 7489) and the new RFC 9990 schema for the final DMARC standard (RFC 9989)
- Parses failure/ruf DMARC reports (RFC 6591 and RFC 9991; formerly called forensic reports)
- Parses reports from SMTP TLS Reporting (TLS-RPT, RFC 8460)
- Can parse reports from an inbox over IMAP, Microsoft Graph, or Gmail API
- Transparently handles gzip or zip compressed reports
- Consistent data structures
- Simple JSON and/or CSV output
- Optionally email the results
- Optionally send the results to Elasticsearch, OpenSearch, Splunk, or PostgreSQL, for use with premade dashboards
- Optionally send the results to Apache Kafka, Amazon S3, Azure Log Analytics (Microsoft Sentinel), a Graylog (GELF) endpoint, a syslog server, or an HTTP webhook
Python Compatibility
This project supports the following Python versions, which are either actively maintained or are the default versions for RHEL or Debian.
| Version | Supported | Reason |
|---|---|---|
| < 3.6 | ❌ | End of Life (EOL) |
| 3.6 | ❌ | Used in RHEL 8, but not supported by project dependencies |
| 3.7 | ❌ | End of Life (EOL) |
| 3.8 | ❌ | End of Life (EOL) |
| 3.9 | ❌ | Used in Debian 11 and RHEL 9, but not supported by project dependencies |
| 3.10 | ✅ | Actively maintained |
| 3.11 | ✅ | Actively maintained; supported until June 2028 (Debian 12) |
| 3.12 | ✅ | Actively maintained; supported until May 2035 (RHEL 10) |
| 3.13 | ✅ | Actively maintained; supported until June 2030 (Debian 13) |
| 3.14 | ✅ | Supported (requires imapclient>=3.1.0) |