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  4. CVE 2026 128126 aiohttp too many url encoded form fields block
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Back to active CVEs
High · CVSS 8.7CVE-2026-128126

AIOHTTP: Too many URL-encoded form fields block the event loopCVE-2026-128126

Answer in brief

CVE-2026-128126 records a High severity (CVSS 8.7) vulnerability in AIOHTTP: Too many URL-encoded form fields block the event loop. The current sources do not mark it as known exploited. The current feed maps aio-libs/aiohttp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 13, 2026Updated Nov 13, 2026Source checked Nov 13, 2026First seen by HOL Nov 13, 2026Material review Nov 13, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps aio-libs/aiohttp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
aio-libs/aiohttpgeneric<3.14.43.14.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for aio-libs/aiohttp.
  2. 2Review the reported fix. Update aio-libs/aiohttp to 3.14.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 13, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Request.post() does not limit the number of fields in a URL-encoded form body, and inserting many repeated keys into MultiDict takes quadratic time on the event loop. A remote attacker can send a form POST within client_max_size to a handler that calls Request.post() and block the event loop. This issue is fixed in version 3.14.4.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • AIOHTTP: Event loop stall in add_domain() wildcard matchingSame aio-libs/aiohttp package
  • AIOHTTP: Unbounded cookie storage in client CookieJarSame aio-libs/aiohttp package
  • AIOHTTP: Base64 multipart parts bypass client_max_sizeSame aio-libs/aiohttp package
  • AIOHTTP: WebSocket max_msg_size bypass via integer overflowSame aio-libs/aiohttp package
  • AIOHTTP: Unbounded buffering of data received during an upgrade requestSame aio-libs/aiohttp package
  • AIOHTTP: Pure-Python parser request replay and buffer growth behind a declined upgradeSame aio-libs/aiohttp package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-407
Source
CVE List V5
Source checked
Nov 13, 2026
References
6 linked sources
Open source record