Unauthenticated service restart via sparse deepObject indexes
Published Aug 21, 2026 · Updated Aug 21, 2026
Uncontrolled resource consumption in kin-openapi 0.124.0 through 0.141.0 allows remote attackers to trigger OOM restarts via crafted queries. openapi3filter.sliceMapToSlice turns an attacker-controlled sparse deepObject array index into a dense slice through the highest index, and buildResObj allocates a second equal-length slice before schema validation. Exploitation requires an array-bearing deepObject query parameter; one unauthenticated request can exhaust service memory, while other parameter styles and request-body encodings are unaffected.
Summary
What happened
Uncontrolled resource consumption in kin-openapi 0.124.0 through 0.141.0 allows remote attackers to trigger OOM restarts via crafted queries. openapi3filter.sliceMapToSlice turns an attacker-controlled sparse deepObject array index into a dense slice through the highest index, and buildResObj allocates a second equal-length slice before schema validation. Exploitation requires an array-bearing deepObject query parameter; one unauthenticated request can exhaust service memory, while other parameter styles and request-body encodings are unaffected.
The record
- CVE
- CVE-2026-77354
- Published
- Aug 21, 2026
- Updated
- Aug 21, 2026
- Vendor
- getkin
- Product
- kin-openapi
- Classifications
- CWE-400, CWE-789, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 21, 2026CVE publishedPublication date reported by the CVE source.
- Aug 21, 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=>= 0.124.0, < 0.142.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- GHSA-xhj3-7xw9-vr34 deepObject allocation PoCproof of concept · demonstrated
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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