GHSA-3xpg-4rpp-hhhm
undici vulnerable to Denial of Service via unbounded decompression of compressed responses
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
The `interceptors.decompress()` interceptor decompresses HTTP response bodies according to the untrusted `Content-Encoding` header. The number of decompression layers is capped at 5, but the total decompressed output size is not bounded and there is no option to limit it. A malicious or faulty upstream can return a small compressed payload (a compression bomb) that expands to hundreds of megabytes or gigabytes in client memory, exhausting memory and causing the Node.js process to crash or become unresponsive. Any application using the decompress interceptor to read responses from untrusted or compromised upstreams is affected.
### Patches
Upgrade to `7.29.1` or `8.10.2`. The interceptor now accepts a `maxSize` option (default 64 MiB) and rejects responses whose decompressed output exceeds it with a `ResponseExceededMaxSizeError`.
### Workarounds
Once upgraded, set a conservative `maxSize` on the interceptor. Before upgrading, avoid using `interceptors.decompress()` with untrusted upstreams, or apply a custom interceptor that enforces a decompressed output size limit.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/nodejs/undici/security/advisories/GHSA-3xpg-4rpp-hhhm
- https://nvd.nist.gov/vuln/detail/CVE-2026-84890
- https://github.com/nodejs/undici/commit/2c7d7e1227043c644c4c32cfd1e276f4fd4fcb11
- https://github.com/nodejs/undici/commit/7aac7f12f757844763c8b8f1ab6e305e80d55838
- https://cna.openjsf.org/security-advisories.html
- https://github.com/nodejs/undici
- https://github.com/nodejs/undici/releases/tag/v7.29.1
- https://github.com/nodejs/undici/releases/tag/v8.10.2