CVE-2026-54117
CRITICAL 9.8 ALL-YEARSDeserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.
Severe if exploited (CVSS 9.8), but no confirmed exploitation. Patch on a normal cadence.
Exploitation likelihood
1.5%chance of exploitation in 30 days · 75th percentile
Impact if exploited
9.8CVSS 3.1 · CRITICAL · CNA
- ConfidentialityHigh
- IntegrityHigh
- 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
No public PoC is currently catalogued.
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Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Affected
Vendors Microsoft
Products Microsoft Sql Server 2025 (Cu 6) Microsoft Sql Server 2025 For X64 Based Systems (Gdr) Sql Server 2016 Sql Server 2017 Sql Server 2019 Sql Server 2022 Sql Server 2025
Weakness (CWE)
- CWE-502: : Deserialization of Untrusted Data
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References and research data (JSON)
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Microsoft | Sql Server 2016 | ≥ 13.0.6300.2 and < 13.0.6500.1 |
| Microsoft | Sql Server 2016 | ≥ 13.0.7000.253 and < 13.0.7095.1 |
| Microsoft | Sql Server 2017 | ≥ 14.0.1000.169 and < 14.0.2120.1 |
| Microsoft | Sql Server 2017 | ≥ 14.0.3006.16 and < 14.0.3540.1 |
| Microsoft | Sql Server 2019 | ≥ 15.0.2000.5 and < 15.0.2180.2 |
| Microsoft | Sql Server 2019 | ≥ 15.0.4003.23 and < 15.0.4480.2 |
| Microsoft | Sql Server 2022 | ≥ 16.0.1000.6 and < 16.0.1190.2 |
| Microsoft | Sql Server 2022 | ≥ 16.0.4003.1 and < 16.0.4262.2 |
| Microsoft | Sql Server 2025 | ≥ 17.0.1000.7 and < 17.0.1125.2 |
| Microsoft | Sql Server 2025 | ≥ 17.0.4006.2 and < 17.0.4060.2 |
All CVSS metrics
- CRITICAL 9.8 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - CRITICAL 9.8 v3.1 · NVD Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Patches & mitigations
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54117 CVE record · microsoft · Updated 2026-10-08T18:13:18.117Z
NVD · CVE-2026-54117 · Updated 2026-08-20T17:18:16.150
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-44031 EUVD · EUVD-2026-44031
Sources: NVD · CVE.org · All sources and attribution · EPSS