CVE-2026-21438— webtransport-go affected by a Memory Exhaustion Attack due to Missing Cleanup of Streams Map
Quick assessment
Affected
quic-go webtransport-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
webtransport-go是quic-go开源的一个Go语言库。 webtransport-go 0.10.0之前版本存在安全漏洞，该漏洞源于已关闭的流未从内部会话映射中移除，可能导致内存无限制消耗。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-21438
Vulnerability Information
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Vulnerability Title
webtransport-go affected by a Memory Exhaustion Attack due to Missing Cleanup of Streams Map
Source: CVE Program / CVE List V5
Vulnerability Description
webtransport-go is an implementation of the WebTransport protocol. Prior to 0.10.0, an attacker can cause unbounded memory consumption repeatedly creating and closing many WebTransport streams. Closed streams were not removed from an internal session map, preventing garbage collection of their resources. This vulnerability is fixed in v0.10.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
webtransport-go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
webtransport-go是quic-go开源的一个Go语言库。 webtransport-go 0.10.0之前版本存在安全漏洞，该漏洞源于已关闭的流未从内部会话映射中移除，可能导致内存无限制消耗。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| quic-go | webtransport-go | < 0.10.0 | - |
|
II. Public POCs for CVE-2026-21438
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-21438 (1)
Same Patch Batch · quic-go · 2026-02-12 · 3 CVEs total
| CVE-2026-21434 | 5.3 MEDIUM | webtransport-go affected by Memory Exhaustion Attack due to Missing Length Check in WT_CLO |
| CVE-2026-21435 | 5.3 MEDIUM | webtransport-go CloseWithError can block indefinitely |
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