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Vulnerabilities

Vulnerability · CVE-2026-111748

AIOHTTP: Absolute-form request targets can spoof Request.scheme

Published Oct 19, 2026 · catalog updated Oct 20, 2026 · AIOHTTP: Absolute-form request targets

Last checked Oct 28, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-111748. EPSS is 0.39%. Act only if a listed version of AIOHTTP: Absolute-form request targets is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (AIOHTTP: Absolute-form request targets).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Version ranges on file
Affected products
pip aiohttp · vendor aio-libs aiohttp

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • pip aiohttp<= 3.14.3
  • vendor aio-libs aiohttpversion unspecified

How to fix CVE-2026-111748

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-111748. EPSS is 0.39%. Act only if a listed version of AIOHTTP: Absolute-form request targets is installed.

Which versions are affected?

Compare what you have installed with <= 3.14.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-807. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 20, 2026 · GitHub Advisory Database

    Detected

    ### Summary An attacker sending an absolute-form request can spoof the scheme used. ### Impact If user code depends on the attribute for anything security related, an attacker may be able to circumvent this logic, tricking the application into thinking a connection is encrypted when it is not, or vice versa. ### Workaround A WAF rule to reject absolute-form requests (legitimate requests should onl

  2. Oct 20, 2026 · GitHub Advisory Database

    Updated

    ### Summary An attacker sending an absolute-form request can spoof the scheme used. ### Impact If user code depends on the attribute for anything security related, an attacker may be able to circumvent this logic, tricking the application into thinking a connection is encrypted when it is not, or vice versa. ### Workaround A WAF rule to reject absolute-form requests (legitimate requests should onl

Sources

  • CVE.orgVulnerability recordCVE-2026-111748

    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 us

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-111748

    30-day exploitation probability 0.39%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-f9xw-jh8m-3mwq

    AIOHTTP: Absolute-form request targets can spoof Request.scheme

    github.com

References

Freshness

Last verified in this catalog Oct 28, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 28, 2026
  • CVE.orgOct 23, 2026
  • GitHub Advisory DatabaseOct 21, 2026