CVE-2026-27695 json
zae-limiter: DynamoDB hot partition throttling enables per-entity Denial of Service
published 2026-02-25 8 mo ago modified 2026-07-13 3 mo ago also GHSA-76rv-2r9v-c5m6 , PYSEC-2026-3434 , EUVD-2026-8642
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi zae-limiter 0.10.1
- zeroae zae-limiter 0.10.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | zae-limiter | <0.10.1 |
0.10.1 |
Affected products
- zeroae zae-limiter
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
github.com
/zeroae/zae-limiter/commit/481ce44d818d66e31d8837bc48519660ce4c267f
web
-
github.com
/zeroae/zae-limiter/security/advisories/GHSA-76rv-2r9v-c5m6
web, vendor-advisory
-
github.com
/zeroae/zae-limiter/releases/tag/v0.10.1
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-27695
advisory
-
github.com
/zeroae/zae-limiter
package
-
pypi.org
/project/zae-limiter
package
-
github.com
/advisories/GHSA-76rv-2r9v-c5m6
advisory
Sources
- CVE List CVE-2026-27695
- GitHub Advisory GHSA-76rv-2r9v-c5m6
- NVD CVE-2026-27695
- OSV PYSEC-2026-3434
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