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CVE-2026-96958

HIGH 7.5

Published 2026-10-13 · Last modified 2026-10-20

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

ELEVATED IMPACT

Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

1.0%chance of exploitation in 30 days · 63rd percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

7.5CVSS 3.1 · HIGH

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-96958/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-96958/poc.json

Affected

Vendors Microsoft Apple Linux

Products Microsoft .Net Framework 3.5 Microsoft .Net Framework 3.5 And 4.6.2/4.7/4.7.1/4.7.2 Microsoft .Net Framework 3.5 And 4.7.2 Microsoft .Net Framework 3.5 And 4.8 Microsoft .Net Framework 3.5 And 4.8.1 Microsoft .Net Framework 4.6.2/4.7/4.7.1/4.7.2 Microsoft .Net Framework 4.8 Microsoft .Net Framework 4.8.1 System.Security.Cryptography.Xml .Net Macos Linux Kernel

Weakness (CWE)

  • CWE-407: : Inefficient Algorithmic Complexity

CVSS vector

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

Known Affected Software Configurations

VendorProductVersion range
Microsoft.Net≥ 8.0.0 and < 8.0.5
Microsoft.Net≥ 9.0.0 and < 9.0.21
Microsoft.Net≥ 10.0.0 and < 10.0.13
Microsoft.Net11.0.0
Microsoft.Net11.0.0
Microsoft.Net11.0.0
Microsoft.Net11.0.0
Microsoft.Net11.0.0
Microsoft.Net11.0.0
Microsoft.Net11.0.0
Microsoft.Net11.0.0
Microsoft.Net Framework4.8.1
Microsoft.Net Framework4.8
Microsoft.Net Framework4.6.2
Microsoft.Net Framework4.7
Microsoft.Net Framework4.7.1
Microsoft.Net Framework4.7.2
Microsoft.Net Framework3.5
Microsoft.Net Framework4.8.1
Microsoft.Net Framework3.5
Microsoft.Net Framework4.8
Microsoft.Net Framework3.5
Microsoft.Net Framework4.7.2
Microsoft.Net Framework3.5
Microsoft.Net Framework4.6.2
Microsoft.Net Framework4.7
Microsoft.Net Framework4.7.1
Microsoft.Net Framework4.7.2
Microsoft.Net Framework3.5

All CVSS metrics

  • HIGH 7.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
  • HIGH 7.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Patches & mitigations

Sources: NVD · CVE.org · EPSS