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Full vulnerability report · 2026
CVE-2026-92987High confidence

roxmltree through 0.21.1 Denial of Service via Quadratic Parsing

RazrFalcon · roxmltree

8.7HighCVSS 4.0
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 6 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.63% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs RazrFalcon roxmltree and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 6 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Direct vendor intelligence

Authoritative 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.

2 current
CVE-2026-92987 · CSAF 2.0 · revision 3 · interimSUSE Product Security TeamCVE-2026-92987
28 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • gstreamer-plugins-rs as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
  • gstreamer-plugins-rs-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
  • gstreamer-plugins-rs as component of SUSE Linux Enterprise High Performance Computing 15 SP5
  • gstreamer-plugins-rs-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP5
  • gstreamer-plugins-rs as component of SUSE Linux Enterprise Server 15 SP5-LTSS
  • gstreamer-plugins-rs-devel as component of SUSE Linux Enterprise Server 15 SP5-LTSS
  • gstreamer-plugins-rs as component of SUSE Linux Enterprise Server 15 SP5
  • gstreamer-plugins-rs-devel as component of SUSE Linux Enterprise Server 15 SP5
  • libdovi as component of SUSE Linux Enterprise Server 16.0
  • libdovi3 as component of SUSE Linux Enterprise Server 16.0
  • python-uv as component of SUSE Linux Enterprise Server 16.0
  • python313-uv as component of SUSE Linux Enterprise Server 16.0
Summary
roxmltree through 0.21.1 performs quadratic-time attribute and namespace validation during XML parsing without limits on attribute count. Attackers can craft XML documents with tens of thousands of attributes on a single element to consume excessive CPU time and cause denial of service.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2026-92987 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityroxmltree: roxmltree: Denial of Service via Quadratic Parsing
6 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation
  • openshift-logging/vector-rhel9 as a component of Logging Subsystem for Red Hat OpenShift
  • rhtas/tuffer-rhel9 as a component of Red Hat Trusted Artifact Signer
  • rhtas/tuftool-rhel9 as a component of Red Hat Trusted Artifact Signer
  • rhtpa/rhtpa-rhel10 as a component of Red Hat Trusted Profile Analyzer
  • rhtpa/rhtpa-trustification-service-rhel9 as a component of Red Hat Trusted Profile Analyzer
Summary
A flaw was found in roxmltree. This vulnerability allows a remote attacker to cause a denial of service (DoS) by crafting a malicious XML document with a large number of attributes on a single element. The roxmltree library performs quadratic-time validation of attributes and namespaces during XML parsing without imposing limits on the attribute count, leading to excessive CPU consumption.
Remediation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-81624

No EUVD known-exploited evidence

roxmltree through 0.21.1 performs quadratic-time attribute and namespace validation during XML parsing without limits on attribute count. Attackers can craft XML documents with tens of thousands of attributes on a single element to consume excessive CPU time and cause denial of service.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
8.7 · CVSS 4.0
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 6 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

roxmltree through 0.21.1 performs quadratic-time attribute and namespace validation during XML parsing without limits on attribute count. Attackers can craft XML documents with tens of thousands of attributes on a single element to consume excessive CPU time and cause denial of service.

What

roxmltree through 0.21.1 performs quadratic-time attribute and namespace validation during XML parsing without limits on attribute count. Attackers can craft XML documents with tens of thousands of attributes on a single element to consume excessive CPU time and cause denial of service.

Why

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

roxmltree through 0.21.1 performs quadratic-time attribute and namespace validation during XML parsing without limits on attribute count. Attackers can craft XML documents with tens of thousands of attributes on a single element to consume excessive CPU time and cause denial of service.

Why

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

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
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Inefficient Algorithmic Complexity → disrupt the affected service
Attack surface
Network
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-407 ↗

CWE-407: Inefficient Algorithmic Complexity. An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.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.VAHighVulnerable-system availability: A successful attack can cause a major 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
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-407
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-81624Official EUVD mapping

roxmltree through 0.21.1 performs quadratic-time attribute and namespace validation during XML parsing without limits on attribute count. Attackers can craft XML documents with tens of thousands of attributes on a single element to consume excessive CPU time and cause denial of service.

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260923Security Bulletin 23 Sep 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 23 Sep 2026, published on 23 September 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
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
Fixed
No fixed version is explicitly recorded in the structured CVE data.
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
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 17 Sept 2026 · Last source change 24 Sept 2026, 14:22 UTC · CWE-407 · Inefficient Algorithmic Complexity

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-18
European sourceENISA EUVD · EUVD-2026-81624
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCNA
NVD statusNVD not scheduled

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    SUSE Product Security Team ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation; openshift-logging/vector-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; trustee-kbs as a component of Red Hat Enterprise Linux 10; rhtas/tuffer-rhel9 as a component of Red Hat Trusted Artifact Signer; rhtas/tuftool-rhel9 as a component of Red Hat Trusted Artifact Signer; rhtpa/rhtpa-rhel10 as a component of Red Hat Trusted Profile Analyzer; rhtpa/rhtpa-trustification-service-rhel9 as a component of Red Hat Trusted Profile Analyzer
    After
    build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation; openshift-logging/vector-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; rhtas/tuffer-rhel9 as a component of Red Hat Trusted Artifact Signer; rhtas/tuftool-rhel9 as a component of Red Hat Trusted Artifact Signer; rhtpa/rhtpa-rhel10 as a component of Red Hat Trusted Profile Analyzer; rhtpa/rhtpa-trustification-service-rhel9 as a component of Red Hat Trusted Profile Analyzer
    Red Hat Product Security ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-92987 to remediation: access.redhat.com/CVE-2026-92987.
    Before
    remediation: access.redhat.com/CVE-2026-92987
    After
    remediation: access.redhat.com/CVE-2026-92987
    Red Hat Product Security ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    Red Hat Product Security ↗
  5. ENISA EUVD mappingEUVD-2026-81624 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-81624"}
    ENISA EUVD ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation; openshift-logging/vector-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; trustee-kbs as a component of Red Hat Enterprise Linux 10; openshell.src as a component of Red Hat Hardened Images; rust.src as a component of Red Hat Hardened Images; rhtas/tuffer-rhel9 as a component of Red Hat Trusted Artifact Signer; rhtas/tuftool-rhel9 as a component of Red Hat Trusted Artifact Signer; rhtpa/rhtpa-rhel10 as a component of Red Hat Trusted Profile Analyzer; rhtpa/rhtpa-trustification-service-rhel9 as a component of Red Hat Trusted Profile Analyzer
    After
    build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation; openshift-logging/vector-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; trustee-kbs as a component of Red Hat Enterprise Linux 10; rhtas/tuffer-rhel9 as a component of Red Hat Trusted Artifact Signer; rhtas/tuftool-rhel9 as a component of Red Hat Trusted Artifact Signer; rhtpa/rhtpa-rhel10 as a component of Red Hat Trusted Profile Analyzer; rhtpa/rhtpa-trustification-service-rhel9 as a component of Red Hat Trusted Profile Analyzer
    Red Hat Product Security ↗
  7. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Remediation guidance recorded
ENISA EUVD · EUVD-2026-81624↗SUSE Product Security Team security advisory↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
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.
Free version - for non-commercial use only.CVE-2026-92987 · cve.blacktree.nl