Allocation of Resources Without Limits or Throttling Affecting microsoft.aspnetcore.server.kestrel.core package, versions [2.3.0,2.3.6)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published20 Mar 2026
- disclosed19 Mar 2026
- creditIsa Jafarov
Introduced: 19 Mar 2026
NewCVE-2026-25667 (opens in a new tab)How to fix?
Upgrade Microsoft.AspNetCore.Server.Kestrel.Core to version 2.3.6 or higher.
Overview
Microsoft.AspNetCore.Server.Kestrel.Core is a core components of ASP.NET Core Kestrel cross-platform web server.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling due to an incorrect exit condition in the HTTP/3 Encoder/Decoder stream processing. An attacker can cause excessive CPU consumption by sending specially crafted QUIC packets.
PoC
stream_id=6
fin_bit=1
offset=0
payload: empty Qpack Encoder data