# CVE-2026-82521: parsedmarc 9.0.6 < 11.0.1 Path Traversal via Forensic Report Subject

Status: published. Published: 2026-09-03. Updated: 2026-11-08.

parsedmarc 9.0.6 before 11.0.1 writes forensic report sample files using an output path derived from the email subject. When the subject consists entirely of path traversal sequences, the filename sanitization function produces an empty string, and a fallback to the raw unsanitized subject causes the resulting file to be written outside the intended samples directory. An attacker who can cause a forensic failure report with a crafted Subject to be processed can write a dot-prefixed file with attacker-controlled content to an ancestor directory of the configured samples output path. Exploitation requires that file output for forensic report samples is enabled.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/domainaware/parsedmarc/releases/tag/11.0.1

## Affected products and versions

- domainaware / parsedmarc (domainaware/parsedmarc): ≥ 9.0.6; < 11.0.1 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.43% as of 2026-11-08; percentile 37.39%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-22

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/domainaware/parsedmarc/security/advisories/GHSA-c284-w5m6-jhjm (CNA: VulnCheck; vendor-advisory)

- https://github.com/domainaware/parsedmarc/releases/tag/11.0.1 (CNA: VulnCheck; release-notes, patch)

- https://www.vulncheck.com/advisories/parsedmarc-path-traversal-via-forensic-report-subject (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-82521; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-82521; retrieved 2026-11-08; source updated Not reported

Revision: 5e399b15f8e23b48ba372b35bcd139ffc82b0238d48aeaaab4d200672c4c1863

Canonical: https://y2.dev/cve/CVE-2026-82521

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