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CVE-2026-120818VulnerabilityPublished

MongoDB Server's server-side JavaScript support · Use-after-free Weakness

Source GCVE Database

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Authoritative record:CVE-2026-120818· High 7.1

Not known to be exploited · CVSS 7.1 High · fixed in 8.3.16 : patch MongoDB Server soon.

Data as of 10 Nov 2026, 22:37 UTC

CVSS 4.0 base score
7.1High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (mongodb)CVSS 4.07.1
CNA (mongodb)CVSS 3.17.1
Patch
Available – fixed in 8.3.16, 8.0.37, 7.0.48
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 10 Nov 2026.

What to do

Upgrade MongoDB Server to 8.3.16, 8.0.37 or 7.0.48.

Affected software

ProductAffectedFixed in
MongoDBMongoDB ServerAffected
  • >=8.3.0 <8.3.16
Fixed in
  • 8.3.16
MongoDBMongoDB ServerAffected
  • >=8.0.0 <8.0.37
Fixed in
  • 8.0.37
MongoDBMongoDB ServerAffected
  • >=7.0.0 <7.0.48
Fixed in
  • 7.0.48

AI-suggested

If you cannot patch yet, restrict authenticated access to trusted users only and monitor for unusual aggregation requests.

Description

A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript support for aggregation. An authenticated user with minimal or no roles can exploit this by submitting a crafted aggregation request, potentially causing the server to return stale memory contents. This may expose adjacent process memory data and could impact server availability.

References

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