CVE-2026-111749
AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies
Reported by github_m · Published October 19, 2026
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Host-Only scope on an existing parent-domain cookie can be removed by a subdomain. A user who accesses an untrusted subdomain can consequently have host-only protections stripped from cookies, although impact is limited when applications do not reflect those cookies to a browser. This issue is fixed in version 3.14.4.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| commercial-gitlab-cng-ee-fips-19.1 | Chainguard | 19.1.9-r0 |
| py3.13-scanner-test-libraries-aiohttp | Chainguard | 0.0.1-r6 |
| kserve | Chainguard | 0.21.0-r9 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| aio-libs | aiohttp | < 3.14.4 |
| chainguard | commercial-gitlab-cng-ee-fips-19.1 | 0 |
| chainguard | py3.13-scanner-test-libraries-aiohttp | 0 |
| chainguard | kserve | 0 |
| aio-libs | aiohttp | 0 |
| wolfi | kserve | 0 |
| chainguard | metaflow-service | 0 |
| chainguard | litellm-fips | 0 |
| PyPI | aiohttp | 0 |
| chainguard | commercial-gitlab-cng-ee-19.1 | 0 |
Timeline
- Oct 19, 2026 Coalition ESS Score
- Oct 19, 2026 CVE Published
- Oct 20, 2026 CVE Updated
- Oct 20, 2026 EPSS Score (8 in total, the first dated here)
- Oct 30, 2026 Security Advisory
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References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96 x_refsource_CONFIRM
- https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6 x_refsource_MISC
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-111749 advisory
- https://github.com/advisories/GHSA-gx76-c99x-2c96 advisory