Ancestor-directory file write via raw subject fallback
Published Sep 3, 2026 · Updated Sep 3, 2026
Path traversal in DomainAware parsedmarc 9.0.6 through 11.0.0 allows remote attackers to write a dot-prefixed file outside the samples directory. save_output() uses the raw Subject when get_filename_safe_string() returns an empty string, then passes that traversal value to os.path.join() without a containment check. Exploitation requires failure-report sample file output and delivery of a crafted report to the processor.
Summary
What happened
Path traversal in DomainAware parsedmarc 9.0.6 through 11.0.0 allows remote attackers to write a dot-prefixed file outside the samples directory. save_output() uses the raw Subject when get_filename_safe_string() returns an empty string, then passes that traversal value to os.path.join() without a containment check. Exploitation requires failure-report sample file output and delivery of a crafted report to the processor.
The record
- CVE
- CVE-2026-82521
- Published
- Sep 3, 2026
- Updated
- Sep 3, 2026
- Vendor
- DomainAware
- Product
- parsedmarc
- Classifications
- CWE-22
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 3, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=9.0.6 <11.0.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Vendor advisory proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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