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CVE-2026-78323

Jss: jss: jsstrustmanager does not verify nss trust flags on ca certificates

6.5 MediumFix available

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
Low
Availability
None

Exploit likelihood

0.18%Up 0.1 points since Aug 25, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.5

Jss: jss: jsstrustmanager does not verify nss trust flags on ca certificates

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.

Record
CVE-2026-78323
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-295
Updated
2026-11-06
EUVDEUVD-2026-64826 6.5

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.

Record
EUVD-2026-64826
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-06
GitHub AdvisoriesGHSA-vc6r-2f9f-w5j6 6.5

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS...

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.

Record
GHSA-vc6r-2f9f-w5j6
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-295
Updated
2026-11-02
NVD 6.5

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.

Record
CVE-2026-78323
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-295
Updated
2026-11-06
OSVDEBIAN-CVE-2026-78323 6.5

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.

Record
DEBIAN-CVE-2026-78323
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-4134 6.5

jss security update

Java Security Services (JSS) is a java native interface which provides a bridge for java-based applications to use native Network Security Services (NSS). This only works with gcj. Other JREs require that JCE providers be signed.

Security Fix(es):

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.(CVE-2026-78323)

Record
OESA-2026-4134
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVOESA-2026-4135 6.5

jss security update

Java Security Services (JSS) is a java native interface which provides a bridge for java-based applications to use native Network Security Services (NSS). This only works with gcj. Other JREs require that JCE providers be signed.

Security Fix(es):

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.(CVE-2026-78323)

Record
OESA-2026-4135
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-4136 6.5

jss security update

Java Security Services (JSS) is a java native interface which provides a bridge for java-based applications to use native Network Security Services (NSS). This only works with gcj. Other JREs require that JCE providers be signed.

Security Fix(es):

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.(CVE-2026-78323)

Record
OESA-2026-4136
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-4137 6.5

jss security update

Java Security Services (JSS) is a java native interface which provides a bridge for java-based applications to use native Network Security Services (NSS). This only works with gcj. Other JREs require that JCE providers be signed.

Security Fix(es):

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.(CVE-2026-78323)

Record
OESA-2026-4137
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-78323 6.5

A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.

Record
UBUNTU-CVE-2026-78323
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
jss
Debian:12
All versions, plus listed versions
5.10.1-15.3.0-15.4.0-15.4.2-15.5.0-1
Show 4 moreShow less
5.9.0~beta3-15.9.0~beta3-25.9.0~beta3-35.9.0~beta3-4
None known
jss
Debian:14
All versions, plus listed versions
4.3.1-44.3.1-54.3.1-64.3.1-74.4.2-1
Show 40 moreShow less
4.4.2-24.4.2-34.4.2-44.4.2-54.4.2-64.4.3-14.4.4-14.5.0-14.5.0~a4-14.5.1-14.5.3-14.5.3-24.6.0-14.6.1-14.6.1-24.6.1-34.6.2-14.6.3-14.7.0-14.7.0~b1-14.7.0~b4-14.7.0~b4-24.7.1-14.7.2-14.7.3-14.8.0-14.8.0-24.9.1-15.0.0-15.1.0-15.10.1-15.2.0-15.3.0-15.4.0-15.4.2-15.5.0-15.9.0~beta3-15.9.0~beta3-25.9.0~beta3-35.9.0~beta3-4
None known
jss
openEuler:24.03-LTS-SP4
before 5.4.2-3.oe2403sp4
5.4.2-3.oe2403sp4
jss
openEuler:22.03-LTS-SP4
before 5.1.0-4.oe2203sp4
5.1.0-4.oe2203sp4
jss
openEuler:24.03-LTS-SP1
before 5.4.2-3.oe2403sp1
5.4.2-3.oe2403sp1
jss
openEuler:24.03-LTS-SP3
before 5.4.2-3.oe2403sp3
5.4.2-3.oe2403sp3
jss
Ubuntu:16.04:LTS
All versions, plus listed versions
4.3.1-6
None known
jss
Ubuntu:18.04:LTS
All versions, plus listed versions
4.4.2-14.4.2-24.4.2-34.4.2-64.4.3-1
None known
jss
Ubuntu:20.04:LTS
All versions, plus listed versions
4.6.1-34.6.2-14.6.3-1
None known
jss
Ubuntu:22.04:LTS
All versions, plus listed versions
4.8.0-25.0.0-1
None known
jss
Ubuntu:24.04:LTS
All versions, plus listed versions
5.4.2-15.5.0-15.5.0-1build1
None known
jss
Ubuntu:26.10
All versions, plus listed versions
5.9.0~beta3-3ubuntu1
None known
jss
Ubuntu:26.04:LTS
All versions, plus listed versions
5.5.0-1build15.9.0~beta3-3ubuntu1
None known

History

History
RecordedChangedSources
factsCVE List
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-78323 is a medium vulnerability (CVSS 6.5) in Red Hat Certificate System 10, published August 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.18%, the 7th percentile. Fixed in jss 5.4.2-3.oe2403sp4.

References

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