CVE-2023-45288: HTTP/2 CONTINUATION flood in net/http

Vulnerability summary

CVE-2023-45288 is a high (CVSS 7.5) vulnerability in go standard library net/http. EPSS estimates a 91.97% chance of exploitation in the next 30 days, higher than 99.8% of scored vulnerabilities.

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Timeline

1. 04-04-2024
   PublishedVulnerability first disclosed.
2. 04-11-2025
   Last modifiedVulnerability information updated.

Description

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.

No weakness data has been published for this record.