CVE-2024-21548Public exploitNetwork attack vector

Runtime option manipulation via inherited prototype properties

Published Dec 18, 2024 · Updated Aug 19, 2026

Prototype pollution in Bun after 0.0.12 and before 1.1.30 allows remote authenticated users to alter native API behavior via crafted objects. Native APIs such as Glob.scan consult inherited Object.prototype properties in option objects rather than restricting reads to properties owned by the supplied object. Exploitation requires attacker-controlled option objects to reach an affected API; polluted values can change filesystem traversal, including symlink following.

CVSS severity7.7
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in Bun after 0.0.12 and before 1.1.30 allows remote authenticated users to alter native API behavior via crafted objects. Native APIs such as Glob.scan consult inherited Object.prototype properties in option objects rather than restricting reads to properties owned by the supplied object. Exploitation requires attacker-controlled option objects to reach an affected API; polluted values can change filesystem traversal, including symlink following.

The record

CVE
CVE-2024-21548
Published
Dec 18, 2024
Updated
Aug 19, 2026
Vendor
Bun
Product
Bun
Classifications
CWE-1321
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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=0.0.12 <1.1.30

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bun · Bunversion=0.0.12 <1.1.30

Published CVSS scores

7.7SnykCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

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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