CVE-2026-82520

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

September 3, 2026

Last Modified

September 4, 2026

Advisory Details (3)

Auto-updated Sep 3, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_release.
generic

parsedmarc < 11.0.1 Zip Bomb DoS via Compressed Email Attachments | Advisories | VulnCheck

https://www.vulncheck.com/advisories/parsedmarc-zip-bomb-dos-via-compressed-email-attachments
github_release Patch Available

11.0.1

Patch available: domainaware/parsedmarc 11.0.1

https://github.com/domainaware/parsedmarc/releases/tag/11.0.1
github Patch Available🟡 PoC Available

Unbounded Decompression of Attacker-Supplied Attachments Allows Remote DoS · Advisory · domainaware/parsedmarc · GitHub

https://github.com/domainaware/parsedmarc/security/advisories/GHSA-43qf-f35w-2x4r

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:51 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 20:36 UTCEG score recompute
  4. 2026-09-16 21:20 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 09:02 UTCEG score recompute
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-15 08:53 UTCEG score recompute
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-13 22:00 UTCEG score recompute
  12. 2026-09-12 22:44 UTCEG score recompute
  13. 2026-09-11 23:15 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 10:45 UTCEG score recompute
  17. 2026-09-10 11:25 UTCEG score recompute
  18. 2026-09-08 23:06 UTCEG score recompute
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-07 17:10 UTCEG score recompute
  21. 2026-09-06 17:55 UTCEG score recompute
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-05 18:37 UTCEG score recompute
  24. 2026-09-05 15:31 UTCEPSS rescore
  25. 2026-09-04 19:22 UTCEG score recompute
Show 4 more
  1. 2026-09-04 18:41 UTCEG score recompute
  2. 2026-09-03 21:21 UTCEG score recompute
  3. 2026-09-03 20:51 UTCEG score recompute
  4. 2026-09-03 20:48 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82520?
CVE-2026-82520 is a high vulnerability published on September 3, 2026. 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…
When was CVE-2026-82520 disclosed?
CVE-2026-82520 was first published in the National Vulnerability Database on September 3, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82520 actively exploited?
CVE-2026-82520 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.6% of all scored CVEs.
What is the CVSS score of CVE-2026-82520?
CVE-2026-82520 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-82520?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82520, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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