Summary
Resource exhaustion vulnerability in h2 may lead to Denial of Service (DoS)
An attacker with an HTTP/2 connection to an affected endpoint can send a steady stream of invalid frames to force the
generation of reset frames on the victim endpoint.
By closing their recv window, the attacker could then force these resets to be queued in an unbounded fashion,
resulting in Out Of Memory (OOM) and high CPU usage.
This fix is corrected in hyperium/h2#737, which limits the total number of
internal error resets emitted by default before the connection is closed.
Impact
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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h2 to 0.3.24 or later; h2 to 0.4.2 or later
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is GHSA-8R5V-VM4M-4G25? GHSA-8R5V-VM4M-4G25 is a medium-severity security vulnerability in h2 (rust), affecting versions < 0.3.24. It is fixed in 0.3.24, 0.4.2.
- Which versions of h2 are affected by GHSA-8R5V-VM4M-4G25? h2 (rust) versions < 0.3.24 is affected.
- Is there a fix for GHSA-8R5V-VM4M-4G25? Yes. GHSA-8R5V-VM4M-4G25 is fixed in 0.3.24, 0.4.2. Upgrade to this version or later.
- Is GHSA-8R5V-VM4M-4G25 exploitable, and should I be worried? Whether GHSA-8R5V-VM4M-4G25 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-8R5V-VM4M-4G25 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-8R5V-VM4M-4G25?
- Upgrade
h2to 0.3.24 or later - Upgrade
h2to 0.4.2 or later
- Upgrade