CVE-2026-9746: mongodb Reachable Assertion
CVSS: 7.1v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-9746
Published 09-06-2026Last modified 10-06-2026
Vulnerability summary
CVE-2026-9746 is a high (CVSS 7.1) Reachable Assertion vulnerability in mongodb. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.4% of scored vulnerabilities.
CVSS score
7.1/10
010
High · v4.0 (CVE.org)EPSS score
0.47%
0%100%
Low · +0.20 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 09-06-2026PublishedVulnerability first disclosed.
- 10-06-2026Last modifiedVulnerability information updated.
Description
When using $changestreams and $_requestReshardingResumeToken with the exchange option the server hits an invariant which causes the server to crash. There are no special privileges needed. The user must be logged in to issue the statement.
CVSS metrics
6 scores · 3 sources · 2 versionsHigh 7.1Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- NVDNIST7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Medium 6.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.47%
Chance of exploitation in the next 30 days
Percentile
39%
Versus all other CVEs
30-day change
+0.20 pp
From 0.27% on 19-09-2026
19-09-202619-10-2026
EPSS score0.47%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mongodb2 products
- mongodb≥ 7.0.0, < 7.0.35 | ≥ 8.0.0, < 8.0.24 | ≥ 8.2.0, < 8.2.10 | ≥ 8.3.0, < 8.3.3
- mongodb server≥ 8.3.0, < 8.3.3 | ≥ 8.2.0, < 8.2.10 | ≥ 8.0.0, < 8.0.24 | ≥ 7.0.0, < 7.0.35
Ubuntu1 product
- mongodbAll versions (No fix recorded)
2 vendors · 3 products