Vulnpedia
← All CVEs

CVE-2026-47291

CRITICAL 9.8 ALL-YEARS

Published 2026-06-09 · Last modified 2026-09-24 · microsoft · NVD: Analyzed

Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.

LIKELY TARGET

25.3% modeled chance of exploitation in the next 30 days (98th percentile). Prioritize remediation.

Exploitation likelihood

25.3%chance of exploitation in 30 days · 98th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable yes

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.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

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 Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21h2 Windows 10 Version 22h2 Windows 11 Version 23h2 Windows 11 Version 24h2 Windows 11 Version 25h2 Windows 11 Version 26h1 Windows Server 2012 Windows Server 2012 (Server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 (Server Core Installation) Windows Server 2016 Windows Server 2016 (Server Core Installation) Windows Server 2019 Windows Server 2019 (Server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (Server Core Installation) Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1

Weakness (CWE)

  • CWE-190: : Integer Overflow or Wraparound
  • CWE-122: : Heap-based Buffer Overflow

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

VendorProductVersion range
MicrosoftWindows 10 1607< 10.0.14393.9234
MicrosoftWindows 10 1607< 10.0.14393.9234
MicrosoftWindows 10 1809< 10.0.17763.8880
MicrosoftWindows 10 1809< 10.0.17763.8880
MicrosoftWindows 10 21h2< 10.0.19044.7417
MicrosoftWindows 10 21h2< 10.0.19044.7417
MicrosoftWindows 10 21h2< 10.0.19044.7417
MicrosoftWindows 10 22h2< 10.0.19045.7417
MicrosoftWindows 10 22h2< 10.0.19045.7417
MicrosoftWindows 10 22h2< 10.0.19045.7417
MicrosoftWindows 11 23h2< 10.0.22631.7219
MicrosoftWindows 11 23h2< 10.0.22631.7219
MicrosoftWindows 11 24h2< 10.0.26100.8655
MicrosoftWindows 11 24h2< 10.0.26100.8655
MicrosoftWindows 11 25h2< 10.0.26200.8655
MicrosoftWindows 11 25h2< 10.0.26200.8655
MicrosoftWindows 11 26h1< 10.0.28000.2269
MicrosoftWindows 11 26h1< 10.0.28000.2269
MicrosoftWindows Server 2012*
MicrosoftWindows Server 2012r2
MicrosoftWindows Server 2016< 10.0.14393.9234
MicrosoftWindows Server 2019< 10.0.17763.8880
MicrosoftWindows Server 2022< 10.0.20348.5256
MicrosoftWindows Server 2025< 10.0.26100.32995

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 Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Patches & mitigations

Advisories

Sources: NVD · CVE.org · All sources and attribution · EPSS