CVE-2026-82521 parsedmarc 9.0.6 < 11.0.1 Path Traversal via Forensic Report Subject
Attackers can write arbitrary files outside the intended directory via crafted email subjects if forensic report sample output is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-82521?
CVE-2026-82521 is a medium-severity path traversal vulnerability in domainaware parsedmarc, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-82521?
How do I fix CVE-2026-82521?
No fix has been published for CVE-2026-82521 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-82521 being exploited?
There is no known exploitation of CVE-2026-82521 in the wild and no public exploit code.
Sources
Also known as GHSA-c284-w5m6-jhjm.