Server crash via unbounded part-header buffering
Published Sep 11, 2026 · Updated Sep 11, 2026
Resource exhaustion in PillarJS multiparty 2.1.0 through 4.3.0 allows remote attackers to crash servers via oversized multipart part headers. While parsing a part, the parser appends header bytes to an in-memory buffer without enforcing a per-part limit, so one header block consumes process memory until exhaustion. Exposure requires an application to pass attacker-controlled multipart/form-data requests to multiparty; the bounded impact is a process crash and service interruption.
Summary
What happened
Resource exhaustion in PillarJS multiparty 2.1.0 through 4.3.0 allows remote attackers to crash servers via oversized multipart part headers. While parsing a part, the parser appends header bytes to an in-memory buffer without enforcing a per-part limit, so one header block consumes process memory until exhaustion. Exposure requires an application to pass attacker-controlled multipart/form-data requests to multiparty; the bounded impact is a process crash and service interruption.
The record
- CVE
- CVE-2026-87908
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- PillarJS
- Product
- multiparty
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 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.
- Affected versionversion=2.1.0 <4.3.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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