CVE-2026-26833Public exploitNetwork attack vector

Arbitrary command execution via thumbnail parameters

Published Mar 25, 2026 · Updated Mar 25, 2026

OS command injection in thumbler 1.1.2 and earlier allows remote attackers to execute arbitrary commands through crafted thumbnail parameters. The thumbnail() function concatenates input, output, time, and size values into an ffmpeg shell string passed to child_process.exec() without neutralizing shell syntax. Exploitation requires an application to pass attacker-controlled parameter values into the library; commands run with the application's host privileges.

CVSS severity9.8
Critical
EPSS probability2.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in thumbler 1.1.2 and earlier allows remote attackers to execute arbitrary commands through crafted thumbnail parameters. The thumbnail() function concatenates input, output, time, and size values into an ffmpeg shell string passed to child_process.exec() without neutralizing shell syntax. Exploitation requires an application to pass attacker-controlled parameter values into the library; commands run with the application's host privileges.

The record

CVE
CVE-2026-26833
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, CWE-94, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

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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