Hatchet through 0.110.5 Unauthenticated Memory Exhaustion via SNS Ingestion Endpoint

Advisories

Hatchet through 0.110.5 Unauthenticated Memory Exhaustion via SNS Ingestion Endpoint

severity: medium
date: 10/11/2026
Affecting: hatchet <= 0.110.5
CVE: CVE-2026-108755
CWE: CWE-770 Allocation of Resources Without Limits or Throttling
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
References: https://hackmd.io/@haind03/hatchet-public-sns-unbounded-body-before-signature-dos
https://github.com/hatchet-dev/hatchet/blob/56c617e0da399bc9d8a10d2ba74b4950f8a950b8/api/v1/server/handlers/ingestors/sns.go#L15-L32
https://github.com/hatchet-dev/hatchet/blob/56c617e0da399bc9d8a10d2ba74b4950f8a950b8/api/v1/server/middleware/ratelimit/ratelimit.go#L33-L49
https://github.com/hatchet-dev/hatchet
Credit: HaiND from the Post and Telecommunication Institute of Technology
Description: Hatchet through 0.110.5 contains an allocation of resources without limits vulnerability that allows unauthenticated attackers to exhaust memory via the SNS ingestion endpoint. Attackers can send arbitrarily large or concurrent request bodies to POST /api/v1/sns/{tenant}/{event} with any UUID, which the SnsUpdate handler buffers before signature verification, degrading availability.

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