Public proof of concept

CVE-2026-26833

A public proof of concept exists; no exploitation attested.

Published2026-03-25
WeaknessCWE-78 · CWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

thumbler through 1.1.2 allows OS command injection via the input, output, time, or size parameter in the thumbnail() function because user input is concatenated into a shell command string passed to child_process.exec() without proper sanitization or escaping.

Timeline

dates in UTC

2026-03-2516:16CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-26833?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-26833?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Mmahrous thumbler

Branch	Affected	Fixed in	Source
1.1	≤ 1.1.2	no fix published	NVD

thumbler

Branch	Affected	Fixed in	Source
1.1	≤ 1.1.2	no fix published	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

github.comVendor Advisory

Detection

read 2026-10-23 19:25 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedzebbernCVE/CVE-2026-26833

Sources

CISA-ADPSSVC decisionpoc2026-03-28
OpenCVESSVC decisionpoc—
CISA-ADPCVSS 3.19.82026-03-28
NVDCVSS 3.19.8read 2026-10-23
CISA-ADPweakness (CWE)CWE-942026-03-28
NVDweakness (CWE)CWE-78read 2026-10-23
FIRST EPSSEPSS score3.4 %2026-10-22
PoC-in-GitHubproof of concept1read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-03-25
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2026-26833?

Is CVE-2026-26833 actively exploited?

A proof-of-concept exploit exists for CVE-2026-26833, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-26833?

CVE-2026-26833 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

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