Authenticated request rejection via shared DynamoDB partition
Published Feb 25, 2026 · Updated Feb 25, 2026
Denial of service in ZeroAE zae-limiter before 0.10.1 allows remote authenticated users to disrupt rate-limited services. Each acquire() call writes every bucket for an entity under the same DynamoDB partition key, while cascade entities multiply writes without sharding, batching, or client-side admission control. Sustained high-rate traffic can exhaust per-partition write capacity, raising RateLimiterUnavailable after delay and rejecting requests while also throttling co-located entities.
Summary
What happened
Denial of service in ZeroAE zae-limiter before 0.10.1 allows remote authenticated users to disrupt rate-limited services. Each acquire() call writes every bucket for an entity under the same DynamoDB partition key, while cascade entities multiply writes without sharding, batching, or client-side admission control. Sustained high-rate traffic can exhaust per-partition write capacity, raising RateLimiterUnavailable after delay and rejecting requests while also throttling co-located entities.
The record
- CVE
- CVE-2026-27695
- Published
- Feb 25, 2026
- Updated
- Feb 25, 2026
- Vendor
- ZeroAE
- Product
- zae-limiter
- Classifications
- CWE-770, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 25, 2026CVE publishedPublication date reported by the CVE source.
- Feb 25, 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=< 0.10.1
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
- Upstream DynamoDB hot-partition reproduction procedureproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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