# OPENSUSE-SU-2026:21372-1: python-aiohttp security update

OPENSUSE-SU-2026:21372-1, released July 18, 2026, fixes 8 CVEs in python-aiohttp (version 3.11.16-160000.6.1). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/opensuse-su-2026-21372-1
- Platform: Linux
- Released: Jul 18, 2026
- Priority: High (Closes CVE-2026-54277, high severity)
- CVEs: 8, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/openSUSE-SU-2026:21372-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [python-aiohttp](https://patchblox.com/security/data/product/linux/python-aiohttp.md) | opensuse-leap 16.0 | 3.11.16-160000.6.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-54277](https://patchblox.com/security/data/cve/CVE-2026-54277.md) | High | python-aiohttp: `max_line_size` bypass when using the optimised C HTTP parser can lead to excessive resource | 7.5 | 0.0056 |  |
| [CVE-2026-54274](https://patchblox.com/security/data/cve/CVE-2026-54274.md) | High | python-aiohttp: incomplete websocket frame payloads can bypass memory use limits and cause a DoS via excessive | 7.5 | 0.0054 |  |
| [CVE-2026-50269](https://patchblox.com/security/data/cve/CVE-2026-50269.md) | High | python-aiohttp: improper validation of user-controlled strings allows for CRLF injection in multipart headers | 7.5 | 0.0053 |  |
| [CVE-2026-54273](https://patchblox.com/security/data/cve/CVE-2026-54273.md) | High | python-aiohttp: no limit in the HTTP/1 pipelined request queue can lead to excessive resource consumption | 7.5 | 0.0049 |  |
| [CVE-2026-54278](https://patchblox.com/security/data/cve/CVE-2026-54278.md) | High | python-aiohttp: unread compressed request bodies can bypass `client_max_size` during cleanup and cause a DoS | 7.5 | 0.0049 |  |
| [CVE-2026-54279](https://patchblox.com/security/data/cve/CVE-2026-54279.md) | High | python-aiohttp: host-only cookies become domain cookies after `CookieJar` persistence (bsc#1268560). | 7.5 | 0.0049 |  |
| [CVE-2026-54275](https://patchblox.com/security/data/cve/CVE-2026-54275.md) | High | python-aiohttp: `server_hostname` TLS SNI check bypass when an existing connection is reused (bsc#1268549). | 7.5 | 0.0047 |  |
| [CVE-2026-54280](https://patchblox.com/security/data/cve/CVE-2026-54280.md) | High | python-aiohttp: payload resources are not closed correctly when a client disconnects in the middle of a write and | 7.5 | 0.0046 |  |

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Data as of 2026-11-11T07:45:43Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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