Affected: undici

undici's cache interceptor mishandles malformed Cache-Control private directives. In undici 7.0.0 up to before 7.29.0 and 8.0.0 up to before 8.9.0, a response carrying a degenerate qualified private directive, such as private set to an empty value, can be stored in the default shared cache and later served to a different caller with the same cache key, disclosing private response bodies and headers including Set-Cookie. Separately, a Cache-Control header that combines an unqualified private directive with a qualified one triggers an uncaught TypeError in the cache-control parser, which rejects the request and, depending on the consumer's error handling, can terminate the process. Both issues affect applications using the cache interceptor in shared mode, including the default configuration. The issues are fixed in undici 7.29.0 and 8.9.0.

Affected: npm: js-yaml

# Quadratic CPU consumption in `!!omap` resolution (js-yaml 3.x and 4.x)

## Summary

`resolveYamlOmap()` enforces key uniqueness for `!!omap` sequences with a linear scan (`objectKeys.indexOf(...)`) inside the per-element loop, making resolution **O(n²)** in the number of entries. A modestly sized YAML document therefore consumes disproportionate CPU inside `yaml.load()`, giving a denial of service against any consumer that parses untrusted YAML.

`!!omap` is registered in the **default schema** (`lib/schema/default.js` → `require('../type/omap')`), so a plain `yaml.load(untrustedInput)` with no options is affected — no custom schema or non-default configuration is required.

**This is the same weakness as CVE-2026-59870 / GHSA-724g-mxrg-4qvm**, which was fixed in the 5.x line in 5.2.1. That fix was never backported: both currently maintained legacy lines still carry the original implementation.

## Affected versions

| Line | Latest tested | Status | |---|---|---| | 3.x | **3.15.0** | Affected — `objectKeys.indexOf(pairKey)` at `lib/type/omap.js:29` | | 4.x | **4.3.0** | Affected — `objectKeys.indexOf(pairKey)` at `lib/type/omap.js:30` | | 5.x | 5.2.2 | **Not affected** — fixed in 5.2.1 (uses a `Set`) |

Both figures are the newest release of each line at the time of writing, so this is not a "you are on an old version" issue.

## Details

`lib/type/omap.js` (js-yaml 4.3.0):

```js if (objectKeys.indexOf(pairKey) === -1) objectKeys.push(pairKey) else return false ```

`obj…