CVE catalog

CVE-2026-111748

AIOHTTP is an asynchronous HTTP client/server…

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, an attacker can send an absolute-form request that causes Request.scheme to use attacker-controlled request-target scheme data instead of the connection protocol. Applications that use Request.scheme for security decisions can consequently be tricked into treating an unencrypted connection as encrypted or an encrypted connection as unencrypted. This issue is fixed in version 3.14.4.

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Published: Oct 19, 2026, 5:02:21 PM UTC
Updated: Oct 19, 2026, 5:17:03 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.39% · Oct 27, 2026

Projects and upstream resources

[python-aiohttp][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "python-aiohttp",
      "status": "vulnerable",
      "release": "sid",
      "version": "3.14.3-1"
    },
    {
      "name": "python-aiohttp",
      "status": "vulnerable",
      "release": "forky",
      "version": "3.14.3-1"
    },
    {
      "name": "python-aiohttp",
      "status": "vulnerable",
      "release": "trixie",
      "version": "3.11.16-1+deb13u1"
    },
    {
      "name": "python-aiohttp",
      "status": "vulnerable",
      "release": "trixie-security",
      "version": "3.11.16-1+deb13u1"
    },
    {
      "name": "python-aiohttp",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "3.8.4-1+deb12u1"
    },
    {
      "name": "python-aiohttp",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "3.8.4-1+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1151687,
      "name": "python-aiohttp",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1151687,
      "name": "python-aiohttp",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1151687,
      "name": "python-aiohttp",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1151687,
      "name": "python-aiohttp",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "python-aiohttp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "3.11.16-1",
        "3.13.1-1",
        "3.13.3-3",
        "3.13.3-3ubuntu1",
        "3.13.3-3ubuntu1+esm1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-111748"
    },
    {
      "name": "python-aiohttp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.10",
      "versions": [
        "3.13.3-3ubuntu1",
        "3.14.1-4",
        "3.14.1-5",
        "3.14.3-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-111748"
    }
  ]
}

[Debian bug #1151687]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[python3-aiohttp]Unknown
Source package: [python-aiohttp]
Details (4)
- 3.8.4-1+deb12u1 · amd64 · bookworm
  Affected
  nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · arm64 · bookworm
  Affected
  nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
[python-aiohttp-doc]Unknown
Source package: [python-aiohttp]
Details (4)
- 3.8.4-1+deb12u1 · all · bookworm
  Affected
  nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · all · bookworm
  Affected
  nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · all · bookworm-security
  Affected
  nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · all · bookworm-security
  Affected
  nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12

[Debian 13 (Trixie)]

[python3-aiohttp]Unknown
Source package: [python-aiohttp]
Details (4)
- 3.11.16-1+deb13u1 · amd64 · trixie
  Affected
  nvd · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · arm64 · trixie
  Affected
  nvd · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · python-aiohttp · debian · 13
[python-aiohttp-doc]Unknown
Source package: [python-aiohttp]
Details (4)
- 3.11.16-1+deb13u1 · all · trixie
  Affected
  nvd · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · all · trixie
  Affected
  nvd · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · all · trixie-security
  Affected
  nvd · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · all · trixie-security
  Affected
  nvd · python-aiohttp · debian · 13

Observed: Oct 27, 2026, 4:09:06 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]