CVE-2026-59969

Q: How do I fix CVE-2026-59969?

Upgrade zookeeper to 3.9.6 or later.

Q: Is CVE-2026-59969 being actively exploited?

Not that we know of. CVE-2026-59969 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.13% is the estimated probability that it will be exploited in the next 30 days. That is higher than 3% of all scored CVEs.

Q: How severe is CVE-2026-59969?

CVE-2026-59969 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-59969 affect?

Published advisories record a fix for zookeeper (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

7.5

CVSS v3

NVD

Description

Apache ZooKeeper quorum TLS fails to enforce peer hostname verification in FIPS-mode deployments. When sslQuorum=true, zookeeper.fips-mode=true, ssl.quorum.hostnameVerification=true, and ssl.quorum.clientHostnameVerification=true are enabled, the Java SSLSocket quorum path accepts a CA-trusted peer certificate whose SAN does not match the connected host. A malicious or misissued peer certificate can therefore join quorum traffic, participate in leader election, and enter replication flows. Users are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.

CWE-297

How to fix

Remediation Available

zookeeperNVD

Affected:>= 3.9.0, < 3.9.6Fixed in:3.9.6CVE-2026-59969derived from NVD

Affected:>= 3.8.0, < 3.8.7Fixed in:3.8.7CVE-2026-59969derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.13%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Vendor Advisory1

lists.apache.org

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-297 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-3522	Medium	4.0	5.6%	-	Fix
CVE-2018-10936	High	8.1	2.9%	-	Fix
CVE-2020-1887	Critical	9.1	1.6%	-	Fix
CVE-2024-2466	Medium	6.5	1.3%	-	Fix
CVE-2020-14387	High	7.4	1.1%	-	Fix
CVE-2020-15260	Medium	6.8	1.0%	-	Fix

Common questions

How do I fix CVE-2026-59969?

Upgrade zookeeper to 3.9.6 or later.

Is CVE-2026-59969 being actively exploited?

Not that we know of. CVE-2026-59969 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.13% is the estimated probability that it will be exploited in the next 30 days. That is higher than 3% of all scored CVEs.

How severe is CVE-2026-59969?

CVE-2026-59969 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-59969 affect?

Published advisories record a fix for zookeeper (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-18.