CVE-2026-119286: Moto · GraphQL-core has denial of service via memory leak in aborted validations
Affects motoSource GCVE Database
Not known to be exploited · CVSS 7.5 High : upgrade to 5.2.5 soon.
Data as of 31 Oct 2026, 15:54 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 7.5 |
|---|
- Patch
- Available – fixed in 5.2.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 29 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade moto to 5.2.5.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Homebrewmotopkg:brew/motoOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade to Moto version 5.2.5 or later where the issue is fixed. If upgrading is not immediately possible, apply the workaround by clearing the traceback of the shared ValidationAbortedError instance after each validation to prevent memory retention. No other mitigations are specified.
Description
A denial of service vulnerability exists in the GraphQL-core library used by Moto due to a memory leak triggered by aborted validations when the number of validation errors exceeds the max_errors limit (default 100). This causes a shared exception instance to accumulate traceback frames, retaining memory indefinitely and leading to memory exhaustion. The issue affects Moto versions >=5.2.3_1 and <5.2.5 and is fixed in version 5.2.5.
References
- github.com/graphql-python/graphql-core/security/advisories/GHSA-mpqx-q82w-9x46 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-119286 (opens in a new tab)
- github.com/graphql-python/graphql-core/issues/287 (opens in a new tab)
- github.com/graphql-python/graphql-core/pull/288 (opens in a new tab)
- github.com/graphql-python/graphql-core/commit/3c319fd9f4b8f6c9db4189520561bf8dd0e70be9 (opens in a new tab)
- github.com/graphql-python/graphql-core (opens in a new tab)
- github.com/graphql-python/graphql-core/releases/tag/v3.3.1 (opens in a new tab)