CVE-2026-82520
Decompression-bomb in parsedmarc allows remote DoS via crafted compressed email attachments
Is CVE-2026-82520 being exploited?
Not confirmed. CVE-2026-82520 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-82520?
CVE-2026-82520 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-82520?
Yes. A fix has been recorded for CVE-2026-82520. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-82520 affect?
CVE-2026-82520 affects parsedmarc < 11.0.1, DMARC report processing services, Mailboxes monitored by parsedmarc, Containers/VMs running parsedmarc. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-82520?
Upgrade to parsedmarc 11.0.1 and block/scan compressed email attachments
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker sends crafted gzip/ZIP in a DMARC email, forcing unbounded decompression and exhausting RAM, causing parsedmarc crash/DoS.
Patch when possible
- affected< 11.0.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.