CVE-2026-43972
Description
A flaw was found in gun. A malicious or compromised HTTP/2 server can exploit an Origin Validation Error vulnerability by injecting unvalidated HTTP/2 PUSH_PROMISE authority. This allows the server to plant cookies scoped to arbitrary third-party domains into the client's shared cookie store. This can lead to session fixation attacks against those domains and potentially result in account takeover if legitimate session tokens are overridden.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Access Control,Other
Technical Impact: Gain Privileges or Assume Identity; Varies by Context
An attacker can access any functionality that is inadvertently accessible to the source.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
