---
id: CVE-2026-82520
title: >-
  parsedmarc before 11.0.1 decompresses gzip and ZIP attachments in a single
  unbounded read with no limit on decompressed output size
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 una…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-409
published: '2026-09-03'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:43:32.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82520'
references:
  - url: 'https://github.com/domainaware/parsedmarc/releases/tag/11.0.1'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/domainaware/parsedmarc/security/advisories/GHSA-43qf-f35w-2x4r
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/parsedmarc-zip-bomb-dos-via-compressed-email-attachments
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/domainaware/parsedmarc/security/advisories/GHSA-43qf-f35w-2x4r
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00784
epssPercentile: 0.54176
ingestedAt: '2026-09-24T20:51:40.241Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.