CVE-2026-33418Network attack vector

Denial of service via decoy SVG regex match

Published Mar 24, 2026 · Updated Mar 24, 2026

Denial of service in DiceBear before 9.4.2 allows remote attackers to crash Node.js applications via crafted SVG input. The @dicebear/converter ensureSize() function replaces dimensions on only the first regex match for an SVG tag, so a decoy inside an XML comment leaves the real root dimensions unrestricted before renderAsync allocates memory. The affected application must pass attacker-controlled SVG to the Node.js toPng, toJpeg, toWebp, or toAvif path; browser rendering is unaffected, and impact is limited to an out-of-memory crash.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in DiceBear before 9.4.2 allows remote attackers to crash Node.js applications via crafted SVG input. The @dicebear/converter ensureSize() function replaces dimensions on only the first regex match for an SVG tag, so a decoy inside an XML comment leaves the real root dimensions unrestricted before renderAsync allocates memory. The affected application must pass attacker-controlled SVG to the Node.js toPng, toJpeg, toWebp, or toAvif path; browser rendering is unaffected, and impact is limited to an out-of-memory crash.

The record

CVE
CVE-2026-33418
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
DiceBear
Product
DiceBear
Classifications
CWE-185, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 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=< 9.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

DiceBear · DiceBearversion=< 9.4.2

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-185Incorrect Regular Expression
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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