Jun 2026: HTTP.sys Remote Code Execution Vulnerability
CVE-2026-47291 Published on June 9, 2026
HTTP.sys Remote Code Execution Vulnerability
Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.
Weakness Types
Integer Overflow or Wraparound
The software 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 can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound 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 wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-47291
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Affected Versions
Microsoft Windows 10 Version 1607:- Version 10.0.14393.0 and below 10.0.14393.9234 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8880 is affected.
- Version 10.0.19044.0 and below 10.0.19044.7417 is affected.
- Version 10.0.19045.0 and below 10.0.19045.7417 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7219 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7219 is affected.
- Version 10.0.26100.0 and below 10.0.26100.8655 is affected.
- Version 10.0.26200.0 and below 10.0.26200.8655 is affected.
- Version 10.0.28000.0 and below 10.0.28000.2269 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26132 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26132 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23228 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23228 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9234 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9234 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8880 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8880 is affected.
- Version 10.0.20348.0 and below 10.0.20348.5256 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32995 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32995 is affected.