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  4. CVE 2026 111750 aiohttp pure python parser request smuggling
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-111750

AIOHTTP: Pure-Python parser request smugglingCVE-2026-111750

Answer in brief

CVE-2026-111750 records a Medium severity (CVSS 6.3) vulnerability in AIOHTTP: Pure-Python parser request smuggling. 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 Oct 19, 2026Updated Oct 19, 2026Source checked Oct 19, 2026First seen by HOL Oct 19, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.3. 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

    Oct 19, 2026

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

  2. Source modified

    Oct 19, 2026

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

  3. First seen by HOL

    Oct 19, 2026

Sources and claim methodology

  • 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, the pure Python parser accepts ambiguous HTTP request framing. An unauthenticated attacker can consequently smuggle requests when an application uses AIOHTTP_NO_EXTENSIONS or otherwise runs without a standard wheel and an intermediary interprets the framing differently. This issue is fixed in version 3.14.4.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • AIOHTTP: Secure attribute not enforced for shared cookieSame aio-libs/aiohttp package
  • aiohttp server lacks an initial request/header timeoutSame aio-libs/aiohttp package
  • AIOHTTP: Connector pool exhaustion via Max-Age overflowSame aio-libs/aiohttp package
  • AIOHTTP: File descriptor exhaustion in multipart requestsSame aio-libs/aiohttp package
  • AIOHTTP: Absolute-form request targets can spoof Request.schemeSame aio-libs/aiohttp package
  • AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookiesSame aio-libs/aiohttp package

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-444
Source
CVE List V5
Source checked
Oct 19, 2026
References
3 linked sources
Open source record