How severe is CVE-2026-13055?

CVE-2026-13055 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-13055 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-13055?

CVE-2026-13055 affects Mongodb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-13055?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-13055 published?

CVE-2026-13055 was published on 2026-07-22 and last updated on 2026-08-05.

CVE-2026-13055

CVE-2026-13055 is a medium-severity vulnerability in Mongodb with a CVSS 3.x base score of 6.5. 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-617.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-617
Affected product: Mongodb
Published: 2026-07-22
Last modified: 2026-08-05

Description

The `$_internalIndexKey` aggregation expression can be used by any authenticated user to crash a MongoDB server (mongod). The expression fails to handle compound wildcard index specifications, triggering an internal consistency check that aborts the server process. The user must be able to run an aggregation pipeline.

Frequently asked questions

What is CVE-2026-13055?: The `$_internalIndexKey` aggregation expression can be used by any authenticated user to crash a MongoDB server (mongod). The expression fails to handle compound wildcard index specifications, triggering an internal consistency check that aborts the server process. The user must be able to run an aggregation pipeline.
How severe is CVE-2026-13055?: CVE-2026-13055 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-13055 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-13055?: CVE-2026-13055 affects Mongodb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-13055?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-13055 published?: CVE-2026-13055 was published on 2026-07-22 and last updated on 2026-08-05.

References

https://jira.mongodb.org/browse/SERVER-123081

Affected products (1)

cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*

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Other CWE-617 (Reachable Assertion) vulnerabilities

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CVE-2026-31739 — High (CVSS 8.8): In the Linux kernel, the following vulnerability has been resolved: crypto: tegra - Add missing CRYPTO_ALG_ASYNC The…
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Threat intelligence

Threat-intel indicators referencing this CVE:

67.215.227.54 (ipv4-addr)
66.116.243.149 (ipv4-addr)
43.155.238.153 (ipv4-addr)
146.59.232.118 (ipv4-addr)
185.208.206.215 (ipv4-addr)