{"id":"CVE-2026-27695","aliases":["GHSA-76rv-2r9v-c5m6","PYSEC-2026-3434"],"url":"https://o3.security/vulnerability/CVE-2026-27695","summary":"zae-limiter: DynamoDB hot partition throttling enables per-entity Denial of Service","details":"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.","published":"2026-02-25T14:56:27.221Z","modified":"2026-08-05T03:47:22.756961242Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"zae-limiter","fixedVersion":"0.10.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/zeroae/zae-limiter/releases/tag/v0.10.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27695.json"},{"type":"ADVISORY","url":"https://github.com/zeroae/zae-limiter/security/advisories/GHSA-76rv-2r9v-c5m6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27695"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:47:22.756961242Z"}}