What’s Vulnerable › Vulnerabilities

CVE-2026-27695: zae-limiter: DynamoDB hot partition throttling enables per-entity Denial of Service

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-25 · updated 2026-06-17
• Weakness: CWE-770

Description

zae-limiter is a rate limiting library using the token bucket algorithm. Prior to version 0.10.1, all rate limit buckets for a single entity share the same DynamoDB partition key (`namespace/ENTITY#{id}`). A high-traffic entity can exceed DynamoDB's per-partition throughput limits (~1,000 WCU/sec), causing throttling that degrades service for that entity — and potentially co-located entities in the same partition. Version 0.10.1 fixes the issue.

Affected products

• zeroae zae-limiter: before 0.10.1 — fixed in 0.10.1

How to fix

Upgrade to a fixed version: zeroae zae-limiter 0.10.1. Check the vendor advisory for mitigations.

References

• https://github.com/zeroae/zae-limiter/releases/tag/v0.10.1
• https://github.com/zeroae/zae-limiter/security/advisories/GHSA-76rv-2r9v-c5m6

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