CVE-2026-65674
HIGH 8.8Deserialization of untrusted data in SQL Server allows an authorized attacker to execute code over a network.
Severe if exploited (CVSS 8.8), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.9%chance of exploitation in 30 days · 58th percentile
Impact if exploited
8.8CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ✓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
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-65674/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-2026-65674/poc.json
Affected
Vendors Microsoft
Products Microsoft Sql Server 2019 (Gdr) Microsoft Sql Server 2019 For X64 Based Systems (Cu32) Microsoft Sql Server 2022 (Gdr) Microsoft Sql Server 2022 For X64 Based Systems (Cu27) Microsoft Sql Server 2025 For X64 Based Systems (Cu9) Microsoft Sql Server 2025 For X64 Based Systems (Gdr)
Weakness (CWE)
- CWE-502: : Deserialization of Untrusted Data
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
All CVSS metrics
- HIGH 8.8 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - HIGH 8.8 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H