CVE-2026-72838Public exploitNetwork attack vector

Disk exhaustion via unbounded TUS PATCH bodies

Published Aug 14, 2026 · Updated Aug 14, 2026

Resource exhaustion in File Browser before 2.63.19 allows remote authenticated users to exhaust server disk space through TUS uploads. The tusPatchHandler uses io.Copy to write each PATCH body before comparing the resulting offset with the cached Upload-Length, so oversized bodies reach disk. Ordinary create/write permission is sufficient, and repeated uploads can interrupt File Browser and other services sharing the filesystem.

CVSS severity7.1
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in File Browser before 2.63.19 allows remote authenticated users to exhaust server disk space through TUS uploads. The tusPatchHandler uses io.Copy to write each PATCH body before comparing the resulting offset with the cached Upload-Length, so oversized bodies reach disk. Ordinary create/write permission is sufficient, and repeated uploads can interrupt File Browser and other services sharing the filesystem.

The record

CVE
CVE-2026-72838
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
File Browser
Product
File Browser
Classifications
CWE-770, CAPEC-130, T1499.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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 <2.63.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

File Browser · File Browserversion=0 <2.63.19

Published CVSS scores

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-130Excessive Allocation
T1499.001OS Exhaustion Flood

Public exploit references

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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