Description
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.
INFO
Published Date :
2026-02-12T18:18:04.821Z
Last Modified :
2026-02-12T18:45:58.158Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-21434 vulnerability.
| Vendors | Products |
|---|---|
| Quic-go |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21434.
