CVE-2026-65827Network attack vector

Service outage via unbounded ZIP extraction

Published Sep 24, 2026 · Updated Sep 24, 2026

Denial of service in Docmost 0.21.0 and later before 0.95.0 allows remote authenticated users to exhaust disk via page import. The ZIP extractor writes entries to temporary storage without limiting total expansion, entry size, or entry count, and automatically expands one nested ZIP. A workspace member needs space edit rights; a crafted archive under the default 200 MB upload limit can expand by gigabytes, crash the import worker, and disrupt the instance for all tenants.

CVSS severityUnavailable
Unscored
EPSS probability0.29%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Docmost 0.21.0 and later before 0.95.0 allows remote authenticated users to exhaust disk via page import. The ZIP extractor writes entries to temporary storage without limiting total expansion, entry size, or entry count, and automatically expands one nested ZIP. A workspace member needs space edit rights; a crafted archive under the default 200 MB upload limit can expand by gigabytes, crash the import worker, and disrupt the instance for all tenants.

The record

CVE
CVE-2026-65827
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
Docmost
Product
Docmost
Classifications
T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.21.0, < 0.95.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Docmost · Docmostversion=>= 0.21.0, < 0.95.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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