Evidence used
- No CISA KEV confirmation is currently recorded.
- EPSS is 0.47% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-58641High confidence
.NET Elevation of Privilege Vulnerability
Microsoft · SkiaSharp
7.8HighCVSS 3.1
Within 7 days
Patch availableHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:High, 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.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Microsoft SkiaSharp 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.
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-2026-58641 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitydotnet: .NET: Elevation of Privilege via integer overflow or wraparound
The vendor explicitly states that these products are not affected by this CVE.
- aspnetcore-runtime-10.0 as a component of Red Hat Enterprise Linux 10
- aspnetcore-runtime-8.0 as a component of Red Hat Enterprise Linux 10
- aspnetcore-runtime-9.0 as a component of Red Hat Enterprise Linux 10
- aspnetcore-runtime-dbg-10.0 as a component of Red Hat Enterprise Linux 10
- aspnetcore-runtime-dbg-8.0 as a component of Red Hat Enterprise Linux 10
- aspnetcore-runtime-dbg-9.0 as a component of Red Hat Enterprise Linux 10
- aspnetcore-targeting-pack-10.0 as a component of Red Hat Enterprise Linux 10
- aspnetcore-targeting-pack-8.0 as a component of Red Hat Enterprise Linux 10
- aspnetcore-targeting-pack-9.0 as a component of Red Hat Enterprise Linux 10
- dotnet-apphost-pack-10.0 as a component of Red Hat Enterprise Linux 10
- dotnet-apphost-pack-8.0 as a component of Red Hat Enterprise Linux 10
- dotnet-apphost-pack-9.0 as a component of Red Hat Enterprise Linux 10
- Summary
- A flaw was found in .NET. This vulnerability, caused by an integer overflow or wraparound, allows an unauthorized attacker to locally elevate their privileges. This could lead to an attacker gaining higher access rights than intended on the affected system.
- Remediation
- No remediation text is recorded.
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Patch available01
What, why and how
Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
What
Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
Why
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
How
An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may gain additional privileges.
What
Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
Why
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
How
An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may gain additional privileges.
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 None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.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
- local access → Integer Overflow or Wraparound → gain additional privileges
- Attack surface
- Local
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- Required interaction required
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-190 ↗
CWE-190: Integer Overflow or Wraparound. The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CCommon Vulnerability Scoring System 3.1: 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.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.- 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. - Patch available
- Affected
- SkiaSharp: 4.151.2 < 4.151.2
- Action
- Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
- Workaround
- No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04
Evidence and provenance
Published 11 Aug 2026 · Last source change 29 Sept 2026, 20:21 UTC · CWE-190 · Integer Overflow or Wraparound
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-56606
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-23.secure@microsoft.com ↗
- Before
- remediation: acn.gov.it/aggiornamenti-mensili-microsoft-23 · vendor advisory: msrc.microsoft.com/CVE-2026-58641
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-58641
- Remediation statusRemediation status changed from Mitigation available to Awaiting fix.secure@microsoft.com ↗
- Before
- Mitigation available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-23.secure@microsoft.com ↗
- Before
- remediation: acn.gov.it/aggiornamenti-mensili-microsoft-23 · vendor advisory: msrc.microsoft.com/CVE-2026-58641
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-58641
- Remediation statusRemediation status changed from Mitigation available to Awaiting fix.secure@microsoft.com ↗
- Before
- Mitigation available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-23.secure@microsoft.com ↗
- Before
- remediation: acn.gov.it/aggiornamenti-mensili-microsoft-23 · vendor advisory: msrc.microsoft.com/CVE-2026-58641
- After
- vendor advisory: msrc.microsoft.com/CVE-2026-58641
- Remediation statusRemediation status changed from Mitigation available to Awaiting fix.secure@microsoft.com ↗
- Before
- Mitigation available
- After
- Awaiting fix
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- .NET 10.0: 10.0.0 < 10.0.11; .NET 8.0: 8.0.0 < 8.0.30; .NET 9.0: 9.0.0 < 9.0.19 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- SkiaSharp: 4.151.2 < 4.151.2 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- 10.0.0 < 10.0.11; 8.0.0 < 8.0.30; 9.0.0 < 9.0.19 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- 4.151.2 < 4.151.2 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- 4.151.2 < 4.151.2 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- .NET 10.0: 10.0.0 < 10.0.11; .NET 8.0: 8.0.0 < 8.0.30; .NET 9.0: 9.0.0 < 9.0.19 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Remediation statusRemediation status changed from Awaiting fix to Mitigation available.CSIRT Italia ↗
- Before
- Awaiting fix
- After
- Mitigation available
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.