quic-go HTTP/3 QPACK Header Expansion DoS
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.
Summary
quic-go is an implementation of the QUIC protocol in Go. Versions 0.56.0 and below are vulnerable to excessive memory allocation through quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large header field section (many unique header names and/or large values). The implementation builds an http.Header (used on the http.Request and http.Response, respectively), while only enforcing limits on the size of the (QPACK-compressed) HEADERS frame, but not on the decoded header, leading to memory exhaustion. This issue is fixed in version 0.57.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| quic-go | quic-go | before 0.57.0 | 0.57.0 | Patch available | CNA |
| — | github.com/quic-go/quic-go (Go) | before 0.57.0 | 0.57.0 | Patch available | GHSA-g754-hx8w-x2g6 |
- quic-go Vendorquic-go Affected before 0.57.0 Fixed in 0.57.0 Patch available CNA
- github.com/quic-go/quic-go (Go) Vendor— Affected before 0.57.0 Fixed in 0.57.0 Patch available GHSA-g754-hx8w-x2g6
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:quic-go_project:quic-go:*:*:*:*:*:*:*:* | before 0.57.0 | Vulnerable | Quic-go Project |
- cpe:2.3:a:quic-go_project:quic-go:*:*:*:*:*:*:*:* Versions before 0.57.0 Vulnerable ·Quic-go Project
Remediation
- Fix · CNA quic-go (quic-go) Fixed in 0.57.0
- Fix · GHSA-g754-hx8w-x2g6 github.com/quic-go/quic-go (Go) Fixed in 0.57.0 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Cryostat 4 | Affected | No fix yet: Fix deferred |
| OpenShift Service Mesh 2 | Affected | No fix yet: Fix deferred |
| OpenShift Service Mesh 3 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Dev Spaces | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-64702
- 2026-10-03 Alias added: GHSA-g754-hx8w-x2g6
- 2026-10-25 EPSS moved to the 50th–90th percentile
References
More quic-go vulnerabilities
- TI-2024-14782 QUIC's Connection ID Mechanism vulnerable to Memory Exhaustion Attack CVSS 3.1HIGH 7.5
- TI-2023-24866 quic-go vulnerable to pointer dereference that can lead to panic CVSS 3.1HIGH 7.5
- TI-2026-29554 quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion CVSS 3.1HIGH 7.5
- TI-2026-17320 webtransport-go CloseWithError can block indefinitely CVSS 3.1HIGH 7.5
- TI-2026-17319 webtransport-go affected by Memory Exhaustion Attack due to Missing Length Check in WT_CLOSE_SESSION Capsule CVSS 3.1HIGH 7.5
- TI-2025-37061 quic-go has Client Crash Due to Premature HANDSHAKE_DONE Frame CVSS 3.1HIGH 7.5
Sources
- CVE-2025-64702 · CVE Program
- CVE-2025-64702 · NVD
- FIRST EPSS
- GHSA-g754-hx8w-x2g6 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-64702 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences