# h2 (crates.io) vulnerabilities

Source: https://junglewise.ai/threats/technologies/crates-io-h2  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/crates-io-h2.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 6 vulnerabilities in h2 (crates.io): 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, RUSTSEC-2026-0258 - h2 unbounded empty DATA frames, was published on 17 August 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 6 (0 critical, 0 exploited in the wild)

## About h2 (crates.io)

Rust implementation of HTTP/2 protocol for asynchronous communication.

## Latest h2 (crates.io) vulnerabilities

- [RUSTSEC-2026-0258 - h2 unbounded empty DATA frames](https://junglewise.ai/threats/rustsec-2026-0258-h2-unbounded-empty-data-frames-5bcbe117) (info, published 17 Aug 2026)
- [h2 servers vulnerable to degradation of service with CONTINUATION Flood](https://junglewise.ai/threats/h2-servers-vulnerable-to-degradation-of-service-with-continuation-flood-81daddd5) (low, CVSS 3.1, published 5 Apr 2024)
- [RUSTSEC-2024-0332 - Degradation of service in h2 servers with CONTINUATION Flood](https://junglewise.ai/threats/rustsec-2024-0332-degradation-of-service-in-h2-servers-with-21c9aaa3) (info, published 3 Apr 2024)
- [Resource exhaustion vulnerability in h2 may lead to Denial of Service (DoS)](https://junglewise.ai/threats/resource-exhaustion-vulnerability-in-h2-may-lead-to-denial-of-service-8e85215d) (info, published 19 Jan 2024)
- [RUSTSEC-2024-0003 - Resource exhaustion vulnerability in h2 may lead to Denial of Service (DoS)](https://junglewise.ai/threats/rustsec-2024-0003-resource-exhaustion-vulnerability-in-h2-may-lead-to-63dd18ca) (info, published 17 Jan 2024)
- [CVE-2023-26964: RUSTSEC-2023-0034 - Resource exhaustion vulnerability in h2 may lead to Denial of Service (DoS)](https://junglewise.ai/threats/cve-2023-26964-h2-vulnerable-to-denial-of-service) (info, published 14 Apr 2023)

## Most severe h2 (crates.io) vulnerabilities

- [h2 servers vulnerable to degradation of service with CONTINUATION Flood](https://junglewise.ai/threats/h2-servers-vulnerable-to-degradation-of-service-with-continuation-flood-81daddd5) (low, CVSS 3.1, published 5 Apr 2024)
- [CVE-2023-26964: RUSTSEC-2023-0034 - Resource exhaustion vulnerability in h2 may lead to Denial of Service (DoS)](https://junglewise.ai/threats/cve-2023-26964-h2-vulnerable-to-denial-of-service) (info, published 14 Apr 2023)
- [RUSTSEC-2026-0258 - h2 unbounded empty DATA frames](https://junglewise.ai/threats/rustsec-2026-0258-h2-unbounded-empty-data-frames-5bcbe117) (info, published 17 Aug 2026)
- [RUSTSEC-2024-0332 - Degradation of service in h2 servers with CONTINUATION Flood](https://junglewise.ai/threats/rustsec-2024-0332-degradation-of-service-in-h2-servers-with-21c9aaa3) (info, published 3 Apr 2024)
- [Resource exhaustion vulnerability in h2 may lead to Denial of Service (DoS)](https://junglewise.ai/threats/resource-exhaustion-vulnerability-in-h2-may-lead-to-denial-of-service-8e85215d) (info, published 19 Jan 2024)
- [RUSTSEC-2024-0003 - Resource exhaustion vulnerability in h2 may lead to Denial of Service (DoS)](https://junglewise.ai/threats/rustsec-2024-0003-resource-exhaustion-vulnerability-in-h2-may-lead-to-63dd18ca) (info, published 17 Jan 2024)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 1 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other crates.io technologies

- [surrealdb (crates.io)](https://junglewise.ai/threats/technologies/surrealdb): 83 vulnerabilities
- [wasmtime (crates.io)](https://junglewise.ai/threats/technologies/wasmtime): 67 vulnerabilities
- [deno (crates.io)](https://junglewise.ai/threats/technologies/deno): 39 vulnerabilities
- [zebrad (crates.io)](https://junglewise.ai/threats/technologies/zebrad): 27 vulnerabilities
- [russh (crates.io)](https://junglewise.ai/threats/technologies/crates-io-russh): 26 vulnerabilities
- [openssl-src (crates.io)](https://junglewise.ai/threats/technologies/openssl-src): 26 vulnerabilities
- [openssl (crates.io)](https://junglewise.ai/threats/technologies/crates-io-openssl): 25 vulnerabilities
- [rustfs (crates.io)](https://junglewise.ai/threats/technologies/rustfs): 25 vulnerabilities
- [coreutils (crates.io)](https://junglewise.ai/threats/technologies/crates-io-coreutils): 21 vulnerabilities
- [ckb (crates.io)](https://junglewise.ai/threats/technologies/ckb): 19 vulnerabilities
- [apollo-router (crates.io)](https://junglewise.ai/threats/technologies/apollo-router): 13 vulnerabilities
- [deepseek-tui (crates.io)](https://junglewise.ai/threats/technologies/deepseek-tui): 13 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "h2 (crates.io) vulnerabilities", https://junglewise.ai/threats/technologies/crates-io-h2, 9 November 2026.