Prototype pollution in bun
Priority HIGH 69CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
Versions of the package bun after 0.0.12 and before 1.1.30 are vulnerable to Prototype Pollution due to improper input sanitization. An attacker can exploit this vulnerability through Bun's APIs that accept objects. **Note:** This issue relates to the widely known and actively developed 'Bun' JavaScript runtime. The bun package on NPM at versions 0.0.12 and below belongs to a different and older project that happened to claim the 'bun' name in the past.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00671 52nd percentileScored 2026-11-07
Fix Fixed bun: 1.1.30
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | bun | 0.0.12 to before 1.1.30 | 1.1.30 | Patch available | CNA |
- bun Vendor— Affected 0.0.12 to before 1.1.30 Fixed in 1.1.30 Patch available CNA
Remediation
- Fix · CNA bun Fixed in 1.1.30
Timeline
- 2026-10-02 Threatist record created from CVE-2024-21548
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences