Update urllib3 to 2.7.0 (GHSA-mf9v-mfxr-j63j)

[Copilot]

urllib3 2.6.x has decompression-bomb safeguard bypasses in its streaming API (HTTPResponse.read(amt=N) with Brotli, drain_conn() after partial decompression).

• Updated docs/uv.lock: urllib3 2.6.3 → 2.7.0 via uv lock --upgrade-package urllib3

Reachability

Not reachable (high confidence). urllib3 is a transitive dep of requests, pulled in by Sphinx documentation tooling. The vulnerable streaming APIs are never called directly; doc builds don't process compressed responses from untrusted sources. Update is to clear the advisory.

Original prompt

---

This section details the Dependabot vulnerability alert you should resolve

<alert_title>urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API</alert_title>
<alert_description>### Impact

urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once.

urllib3 can perform decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). When using the streaming API since version 2.6.0, the library decompresses only the necessary bytes, enabling partial content consumption.

However, urllib3 before version 2.7.0 could still decompress the whole response instead of the requested portion in two cases:

1. During the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library.
2. When HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here).

These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data; CWE-409) on the client side.

Affected usages

Applications and libraries using urllib3 versions earlier than 2.7.0 may be affected when streaming compressed responses from untrusted sources in either of these cases, unless decompression is explicitly disabled:

1. A response encoded with br is read incrementally with at least two HTTPResponse.read(amt=N) or HTTPResponse.stream(amt=N) calls while using the official Brotli library.
2. HTTPResponse.drain_conn() is called after response decompression has already started.

Remediation

Upgrade to at least urllib3 version 2.7.0 in which the library:

1. Is more efficient for reads with Brotli.
2. Always skips decompression for HTTPResponse.drain_conn().

If upgrading is not immediately possible, the following workarounds may reduce exposure in specific cases:

1. For the Brotli-specific issue only, switch from brotli to brotlicffi until you can upgrade urllib3; the official Brotli package is affected because of [Python] output_buffer_limit is not fully respected google/brotli#1396.
2. If your code explicitly calls HTTPResponse.drain_conn(), call HTTPResponse.close() instead when connection reuse is not important.

Credits

The Brotli-specific issue was reported by @kimkou2024.
HTTPResponse.drain_conn() inefficiency was reported by @Cycloctane.</alert_description>

high
GHSA-mf9v-mfxr-j63j, CVE-2026-44432
urllib3
pip
<vulnerable_versions>= 2.6.3</vulnerable_versions>
<patched_version>2.7.0</patched_version>
<manifest_path>docs/uv.lock</manifest_path>

https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j https://github.com/advisories/GHSA-mf9v-mfxr-j63j

<task_instructions>Resolve this alert by updating the affected package to a non-vulnerable version. Prefer the lowest non-vulnerable version (see the patched_version field above) over the latest to minimize breaking changes. Include a Reachability Assessment section in the PR description. Review the alert_description field to understand which APIs, features, or configurations are affected, then search the codebase for usage of those specific items. If the vulnerable code path is reachable, explain how (which files, APIs, or call sites use the affected functionality) and note that the codebase is actively exposed to this vulnerability. If the vulnerable code path is not reachable, explain why (e.g. the affected API is never called, the vulnerable configuration is not used) and note that the update is primarily to satisfy vulnerability scanners rather than to address an active risk. If the advisory is too vague to determine reachability (e.g. 'improper input validation' with no specific API named), state that reachability could not be determined and explain why. Include a confidence level in the reachability assessment (e.g. high confidence if the advisory names a specific API and you confirmed it is or is not called, low confidence if the usage is indirect and hard to trace). If no patched version is available, check the alert_description field for a Workarounds section — the advisory may describe configuration changes or usage patterns that mitigate the vulnerability without a version update. If a workaround is available, apply it and leave a code comment referencing the advisory identifier explaining it is a temporary mitigation. If neith...

• Resolves scylladb/java-driver alert Cannot discover with TokenAwarePolicy after enabling Compression #107

[nikagra]

LGTM 👍