CVE-2026-82520

HighCVSS 7.5

Published: 03/09/2026(UTC)Updated: 24/09/2026(UTC)Translated: 04/09/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Elevated risk

0.78%

54th percentile - higher than 54% of all known CVEs

Summary

parsedmarc before 11.0.1 decompresses gzip and ZIP attachments in a single unbounded read with no limit on decompressed output size. Because parsedmarc automatically processes incoming DMARC report emails without user interaction, an unauthenticated remote attacker can send a crafted email with a highly compressed attachment to the monitored mailbox, causing the parsedmarc process to allocate memory proportional to the uncompressed size and exhaust available RAM.

Risk Assessment

The risk includes RAM exhaustion, which can lead to denial of service (DoS) and disruption of the DMARC report processing system.

Recommendation

It is recommended to immediately upgrade parsedmarc to version 11.0.1 or later, which introduces decompression size limits.

Other vulnerabilities in parsedmarc

CVE-2026-82521Medium
parsedmarc versions 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.

Original NVD description (English source)

Vulnerability data from NVD (NIST) · CISA KEV · EPSS