Golang
CVE-2026-21434
MEDIUM
GHSA-g6x7-jq8p-6q9q
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
webtransport-go is an implementation of the WebTransport protocol. From 0.3.0 to 0.9.0, an attacker can cause excessive memory consumption in webtransport-go's session implementation by sending a WT_CLOSE_SESSION capsule containing an excessively large Application Error Message. The implementation does not enforce the draft-mandated limit of 1024 bytes on this field, allowing a peer to send an arbitrarily large message payload that is fully read and stored in memory. This allows an attacker to consume an arbitrary amount of memory. The attacker must transmit the full payload to achieve the memory consumption, but the lack of any upper bound makes large-scale attacks feasible given sufficient bandwidth. This vulnerability is fixed in 0.10.0.
AnalysisAI
Webtransport-go versions 0.3.0 through 0.9.0 fail to enforce the 1024-byte limit on Application Error Messages in WT_CLOSE_SESSION capsules, allowing remote attackers to trigger unbounded memory consumption by sending oversized payloads. An unauthenticated attacker can exhaust server memory and cause denial of service, requiring only sufficient bandwidth to transmit the malicious payload. The vulnerability is resolved in version 0.10.0, though no patch is currently available for affected versions.
Technical ContextAI
Classified as CWE-770 (Allocation of Resources Without Limits or Throttling). Affects Webtransport-Go. webtransport-go is an implementation of the WebTransport protocol. From 0.3.0 to 0.9.0, an attacker can cause excessive memory consumption in webtransport-go's session implementation by sending a WT_CLOSE_SESSION capsule containing an excessively large Application Error Message. The implementation does not enforce the draft-mandated limit of 1024 bytes on this field, allowing a peer to send an arbitrarily large message payload that is fully read and stored in memory. This allows an attacker to c
RemediationAI
Fixed in version 0.10.0.. Restrict network access to the affected service where possible.
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Vendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.5 | Fixed |
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External POC / Exploit Code
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