Evidence used
- No CISA KEV confirmation is currently recorded.
- A structured source references public exploit or proof-of-concept material.
- EPSS is 0.18% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-89045High confidence
zstd-jni 1.4.8-4 through 1.5.7-13 Denial of Service via Negative Length
luben · zstd-jni
Official source article: GitHub GHSA-9JX2-GFP9-PHFM ↗. Check the applicable product and release in the original source.
5.1MediumCVSS 4.0
Patch only the product branches with a verified fix
Fix availability varies by productMedium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 32 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityMedium→Operational priority:Medium, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict local access and enforce least privilege on affected hosts.
- Increase monitoring for the attack path and post-exploitation behaviour described in the report.
Verification
- Confirm that the asset runs luben zstd-jni and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Remediation availability differs by product scope
Verified remediation exists for at least one product or source, but 32 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
- Red Hat Product Security: 28 affected or under-investigation product states without a fixed product state in the same current advisory
- Debian Security Tracker: 4 affected package states with no published fix
Distribution package intelligence
5 package statesRelease-specific package status
Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Package result overrides the generic status
BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 4 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | zstd-jni-java | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian bookwormbookworm · source | zstd-jni-java | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian forkyforky · source | zstd-jni-java | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian sidsid · source | zstd-jni-java | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | zstd-jni-java | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 5 Oct 2026 |
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-89045 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitycom.github.luben/zstd-jni: zstd-jni: Denial of Service via negative length parameter
The vendor explicitly identifies these products as affected by this CVE.
- exploit-intelligence/agent-client-rhel9 as a component of Exploit Intelligence
- jenkins-2-plugins.src as a component of OpenShift Developer Tools and Services
- ocp-tools-4/jenkins-rhel8 as a component of OpenShift Developer Tools and Services
- ocp-tools-4/jenkins-rhel9 as a component of OpenShift Developer Tools and Services
- zstd-jni as a component of Red Hat build of Apache Camel 4 for Quarkus 3
- zstd-jni as a component of Red Hat build of Apache Camel for Spring Boot 4
- zstd-jni as a component of Red Hat build of Apicurio Registry 3
- zstd-jni as a component of Red Hat build of Debezium 3
- libarrow as a component of Red Hat Ceph Storage 9
- libarrow-doc as a component of Red Hat Ceph Storage 9
- libarrow.src as a component of Red Hat Ceph Storage 9
- parquet-libs as a component of Red Hat Ceph Storage 9
- Summary
- A flaw was found in zstd-jni. This vulnerability allows an attacker to trigger an infinite loop by providing negative length parameters to the ZstdInputStreamNoFinalizer.read() method. This can cause the read method to spin indefinitely, holding the stream monitor and blocking other threads from accessing the stream, ultimately leading to a Denial of Service (DoS) for the affected application.
- Remediation
- If your integration calls read(byte[], int, int) directly with a computed length, for example a remaining-bytes calculation, add a len >= 0 check before the call. If you can't change the call site, avoid sharing a single ZstdInputStreamNoFinalizer instance across threads or requests, so a bad input only stalls the one caller that triggered it instead of every other caller waiting on the same stream.
Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 32 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Fix availability varies by product01
What, why and how
zstd-jni versions 1.4.8-4 through 1.5.7-13 fail to validate negative length parameters in ZstdInputStreamNoFinalizer.read(), allowing attackers to trigger infinite loops. Attackers can pass negative length values to cause the read method to spin indefinitely while holding the stream monitor, blocking all other threads from accessing the stream.
What
zstd-jni versions 1.4.8-4 through 1.5.7-13 fail to validate negative length parameters in ZstdInputStreamNoFinalizer.read(), allowing attackers to trigger infinite loops. Attackers can pass negative length values to cause the read method to spin indefinitely while holding the stream monitor, blocking all other threads from accessing the stream.
Why
A malformed condition prevents a loop from making progress or terminating, allowing resource exhaustion.
How
An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
zstd-jni versions 1.4.8-4 through 1.5.7-13 fail to validate negative length parameters in ZstdInputStreamNoFinalizer.read(), allowing attackers to trigger infinite loops. Attackers can pass negative length values to cause the read method to spin indefinitely while holding the stream monitor, blocking all other threads from accessing the stream.
Why
A malformed condition prevents a loop from making progress or terminating, allowing resource exhaustion.
How
An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material Reference recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.
- Likely attack path
- local access → Loop with Unreachable Exit Condition ('Infinite Loop') → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Local
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Not a CVSS 4.0 base metric
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-835 ↗
CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop'). The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NCommon Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VALowVulnerable-system availability: A successful attack can cause a limited loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.- Post-exploitation / living off the land
- The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix availability varies by product
- Affected
- exploit-intelligence/agent-client-rhel9 as a component of Exploit Intelligence
- jenkins-2-plugins.src as a component of OpenShift Developer Tools and Services
- ocp-tools-4/jenkins-rhel8 as a component of OpenShift Developer Tools and Services
- ocp-tools-4/jenkins-rhel9 as a component of OpenShift Developer Tools and Services
- zstd-jni as a component of Red Hat build of Apache Camel 4 for Quarkus 3
- zstd-jni as a component of Red Hat build of Apache Camel for Spring Boot 4
- zstd-jni as a component of Red Hat build of Apicurio Registry 3
- zstd-jni as a component of Red Hat build of Debezium 3
- libarrow as a component of Red Hat Ceph Storage 9
- libarrow-doc as a component of Red Hat Ceph Storage 9
- libarrow.src as a component of Red Hat Ceph Storage 9
- parquet-libs as a component of Red Hat Ceph Storage 9
- apache-commons-compress-javadoc (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8
- apache-commons-compress.src (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8
- apache-commons-compress (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8
- jmc as a component of Red Hat Enterprise Linux 9
- jmc.src as a component of Red Hat Enterprise Linux 9
- zstd-jni as a component of Red Hat Fuse 7
- zstd-jni as a component of Red Hat JBoss Enterprise Application Platform 8
- zstd-jni as a component of Red Hat JBoss Enterprise Application Platform Expansion Pack
- rhoai/odh-spark-operator-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- rhoai/odh-th-torch-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- rhoai/odh-th-torch-cuda-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- rhoai/odh-th06-cpu-torch210-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- rhoai/odh-th06-cpu-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- rhoai/odh-th06-cuda130-torch210-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- rhoai/odh-th06-cuda130-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- rhoai/odh-th06-rocm64-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- Action
- Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
- Workaround
- If your integration calls read(byte[], int, int) directly with a computed length, for example a remaining-bytes calculation, add a len >= 0 check before the call. If you can't change the call site, avoid sharing a single ZstdInputStreamNoFinalizer instance across threads or requests, so a bad input only stalls the one caller that triggered it instead of every other caller waiting on the same stream.
04
Evidence and provenance
Published 10 Sept 2026 · Last source change 15 Sept 2026, 14:54 UTC · CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-09-11
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-75634
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- exploit-intelligence/agent-client-rhel9 as a component of Exploit Intelligence; jenkins-2-plugins.src as a component of OpenShift Developer Tools and Services; ocp-tools-4/jenkins-rhel8 as a component of OpenShift Developer Tools and Services; ocp-tools-4/jenkins-rhel9 as a component of OpenShift Developer Tools and Services; zstd-jni as a component of Red Hat build of Apache Camel 4 for Quarkus 3; zstd-jni as a component of Red Hat build of Apache Camel for Spring Boot 4; zstd-jni as a component of Red Hat build of Apicurio Registry 3; zstd-jni as a component of Red Hat build of Debezium 3; zstd-jni as a component of Red Hat build of Quarkus; libarrow as a component of Red Hat Ceph Storage 9; libarrow-doc as a component of Red Hat Ceph Storage 9; libarrow.src as a component of Red Hat Ceph Storage 9; parquet-libs as a component of Red Hat Ceph Storage 9; apache-commons-compress-javadoc (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8; apache-commons-compress.src (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8; apache-commons-compress (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8; jmc as a component of Red Hat Enterprise Linux 9; jmc.src as a component of Red Hat Enterprise Linux 9; zstd-jni as a component of Red Hat Fuse 7; zstd-jni as a component of Red Hat JBoss Enterprise Application Platform 8; zstd-jni as a component of Red Hat JBoss Enterprise Application Platform Expansion Pack; rhoai/odh-spark-operator-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th-torch-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th-torch-cuda-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cpu-torch210-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cpu-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cuda130-torch210-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cuda130-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-rocm64-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- After
- exploit-intelligence/agent-client-rhel9 as a component of Exploit Intelligence; jenkins-2-plugins.src as a component of OpenShift Developer Tools and Services; ocp-tools-4/jenkins-rhel8 as a component of OpenShift Developer Tools and Services; ocp-tools-4/jenkins-rhel9 as a component of OpenShift Developer Tools and Services; zstd-jni as a component of Red Hat build of Apache Camel 4 for Quarkus 3; zstd-jni as a component of Red Hat build of Apache Camel for Spring Boot 4; zstd-jni as a component of Red Hat build of Apicurio Registry 3; zstd-jni as a component of Red Hat build of Debezium 3; libarrow as a component of Red Hat Ceph Storage 9; libarrow-doc as a component of Red Hat Ceph Storage 9; libarrow.src as a component of Red Hat Ceph Storage 9; parquet-libs as a component of Red Hat Ceph Storage 9; apache-commons-compress-javadoc (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8; apache-commons-compress.src (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8; apache-commons-compress (javapackages-tools:201801) as a component of Red Hat Enterprise Linux 8; jmc as a component of Red Hat Enterprise Linux 9; jmc.src as a component of Red Hat Enterprise Linux 9; zstd-jni as a component of Red Hat Fuse 7; zstd-jni as a component of Red Hat JBoss Enterprise Application Platform 8; zstd-jni as a component of Red Hat JBoss Enterprise Application Platform Expansion Pack; rhoai/odh-spark-operator-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th-torch-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th-torch-cuda-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cpu-torch210-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cpu-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cuda130-torch210-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cuda130-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-rocm64-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- 1.4.8-4 < 1.5.7-14 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- zstd-jni: 1.4.8-4 < 1.5.7-14 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.CVE.org ↗
- Before
- No public exploit
- After
- Public exploit reference
- ENISA EUVD mappingEUVD-2026-75634 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-75634"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.