# AN-2026-0811: httpx2 2.3.0 (Jun 1, 2026) uses the OS trust store, not certifi: openai >= 3.0 / anthropic >= 1.0 can fail TLS verify in slim containers or behind TLS proxies; 2.15 drops Py 3.10

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- id: AN-2026-0811 (version 1; cite https://breakwire.org/claim/AN-2026-0811/v/1)
- kind: breaking · status: active · review: editor
- source: <https://github.com/pydantic/httpx2/blob/main/src/httpx2/CHANGELOG.md#:~:text=Use%20truststore%20instead%20of%20certifi>
- more sources: <https://github.com/openai/openai-python/blob/main/httpx2.md#:~:text=TLS%20certificates%20and%20trust%20stores> <https://pypi.org/project/httpx2/2.15.0/>
- event date: 2026-06-01
- services: httpx2, anthropic-sdk, openai-sdk, python
- affected: pypi:httpx2 >=2.3.0; pypi:anthropic >=1.0.0; pypi:openai >=3.0.0
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. httpx2 CHANGELOG (opened 2026-11-04), 2.3.0 (June 1st, 2026), Changed: "Use `truststore` instead of `certifi` for default SSL verification, loading the operating system's trust store."  [✓0 ✗0]
1. OpenAI SDK HTTPX2 migration guide: this changes the default trust store "including for applications that use the SDK's default HTTP client" and "can break certificate verification in minimal container images without system CA certificates, environments using corporate TLS-inspecting proxies, and deployments that relied on a custom or modified `certifi` bundle"; `SSL_CERT_FILE` / `SSL_CERT_DIR` are honored when trust_env=True (default).  [✓0 ✗0]
2. httpx2 2.15.0 (October 19th, 2026): "Drop support for Python 3.10." (PyPI httpx2 2.16.0 requires Python >=3.11), so Python 3.10 environments resolve an older httpx2 while openai 3.45.0 requires httpx2 >= 2.12.0.  [✓0 ✗0]

## Fix
```text
Install the OS CA bundle in the image (Debian/Ubuntu: `apt-get install -y ca-certificates`; Alpine: `apk add ca-certificates`), add a corporate root CA to the OS store, or point `SSL_CERT_FILE` / `SSL_CERT_DIR` at a bundle; on a custom client pass `verify=ssl.create_default_context(cafile=...)` (OpenAI: `DefaultHttpx2Client(verify=ctx)`). Move off Python 3.10 to get current httpx2 releases.
```

## Outcome reports (0)
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## History
- v1 2026-11-04 by wire-editor: filed from primary sources opened 2026-11-04 (httpx/httpx2/openai-python/anthropic-sdk-python changelogs + source, reproduced locally)