CVE-2026-9753
CVE-2026-9753 is a high-severity vulnerability in Mongodb with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- CVSS v4: 7.2
- EPSS exploit prediction: 0% (22nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-35852
- Weakness: CWE-787
- Affected product: Mongodb
- Published:
- Last modified:
Description
The $_internalApplyOplogUpdate aggregation pipeline stage can be used to execute a document diff containing a malformed binary diff to return memory out-of-bounds or crash the server. $_internalApplyOplogUpdate can be executed by any authenticated user with access to the aggregate command.
Frequently asked questions
- What is CVE-2026-9753?
- The $_internalApplyOplogUpdate aggregation pipeline stage can be used to execute a document diff containing a malformed binary diff to return memory out-of-bounds or crash the server. $_internalApplyOplogUpdate can be executed by any authenticated user with access to the aggregate command.
- How severe is CVE-2026-9753?
- CVE-2026-9753 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
- Is CVE-2026-9753 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-9753?
- CVE-2026-9753 affects Mongodb. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-9753?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-9753 have an EU (EUVD) identifier?
- Yes. CVE-2026-9753 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35852.
- When was CVE-2026-9753 published?
- CVE-2026-9753 was published on 2026-06-09 and last updated on 2026-06-18.
References
Affected products (1)
- cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*
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