How severe is CVE-2020-26149?

CVE-2020-26149 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-26149 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26149?

CVE-2020-26149 primarily affects Linuxfoundation Nats.deno. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-26149?

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.

When was CVE-2020-26149 published?

CVE-2020-26149 was published on 2020-09-30 and last updated on 2026-06-17.

CVE-2020-26149

CVE-2020-26149 is a high-severity vulnerability in Linuxfoundation Nats.deno with a CVSS 3.x base score of 7.5. 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-522.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Linuxfoundation Nats.deno
Published: 2020-09-30
Last modified: 2026-06-17

Description

NATS nats.js before 2.0.0-209, nats.ws before 1.0.0-111, and nats.deno before 1.0.0-9 allow credential disclosure from a client to a server.

Frequently asked questions

What is CVE-2020-26149?: NATS nats.js before 2.0.0-209, nats.ws before 1.0.0-111, and nats.deno before 1.0.0-9 allow credential disclosure from a client to a server.
How severe is CVE-2020-26149?: CVE-2020-26149 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-26149 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-26149?: CVE-2020-26149 primarily affects Linuxfoundation Nats.deno. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-26149?: 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.
When was CVE-2020-26149 published?: CVE-2020-26149 was published on 2020-09-30 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:linuxfoundation:nats.deno:*:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats.js:*:*:*:*:*:node.js:*:*
cpe:2.3:a:linuxfoundation:nats.ws:*:*:*:*:*:*:*:*

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