CVE-2026-69243

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 80% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — Patch released this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0

A fix is available — apply it.

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.

CVSS v3
6.3
EG Score
6.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 5, 2026

Advisory Details (3)

Auto-updated Aug 3, 2026
Patch available. Sources: github, github_commit, github_pr.
github Patch Available

HTTP request smuggling via WebSocket upgrade · Advisory · aio-libs/aiohttp · GitHub

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mfx4-hv73-q22v
github_pr

[PR #13016/8ef76ab8 backport][3.14] Fix body reads after failed WS upgrade

Fix merged in aio-libs/aiohttp PR #13017 on 2026-06-30 — awaiting tagged release

https://github.com/aio-libs/aiohttp/pull/13017
github_commit

commit 6ae358f0983c (aio-libs/aiohttp)

Fix landed in aio-libs/aiohttp commit 6ae358f0983c — awaiting tagged release

https://github.com/aio-libs/aiohttp/commit/6ae358f0983c3f4d6f67692b2f8e65dc8e091c98

Vendor Advisories for CVE-2026-69243(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatdiscovery/discovery-server-rhel9:17866385732026-08-13redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
python-aiohttp3.10.0-1 ... 3.9.5-1 (41 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
python-aiohttp3.10.0-1 ... 3.9.5-1 (32 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
python-aiohttp3.11.16-1 ... 3.14.1-4 (14 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
python-aiohttp3.11.16-1 ... 3.14.1-4 (13 versions)——
PyPI(1)
PackageVulnerable rangeFixed inDependents
aiohttp0.1 ... 3.9.5 (308 versions)3.14.2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-15 08:26 UTCEG score recompute
  2. 2026-08-15 08:26 UTCVendor advisory
  3. 2026-08-15 01:30 UTCEPSS rescore
  4. 2026-08-14 09:14 UTCEG score recompute
  5. 2026-08-14 09:14 UTCVendor advisory
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 10:03 UTCEG score recompute
  8. 2026-08-12 13:51 UTCEPSS rescore
  9. 2026-08-12 10:52 UTCEG score recompute
  10. 2026-08-11 11:40 UTCEG score recompute
  11. 2026-08-11 00:00 UTCEPSS rescore
  12. 2026-08-10 12:29 UTCEG score recompute
  13. 2026-08-09 13:47 UTCEPSS rescore
  14. 2026-08-09 13:18 UTCEG score recompute
  15. 2026-08-08 16:37 UTCEPSS rescore
  16. 2026-08-08 14:07 UTCEG score recompute
  17. 2026-08-06 15:44 UTCEG score recompute
  18. 2026-08-06 13:47 UTCEPSS rescore
  19. 2026-08-05 19:17 UTCEPSS rescore
  20. 2026-08-05 19:17 UTCEPSS rescore
  21. 2026-08-05 16:32 UTCEG score recompute
  22. 2026-08-05 15:30 UTCEG score recompute
  23. 2026-08-04 20:36 UTCEG score recompute
  24. 2026-08-04 15:10 UTCEPSS rescore
  25. 2026-08-03 21:20 UTCEG score recompute▲ 6.30
Show 2 more
  1. 2026-08-03 21:20 UTCNVD updateCVSS v3 → 6.3 · CVSS v4 → 6.3
  2. 2026-08-03 21:07 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-69243?
CVE-2026-69243 is a medium vulnerability published on August 3, 2026. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability…
When was CVE-2026-69243 disclosed?
CVE-2026-69243 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-69243 actively exploited?
CVE-2026-69243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 80.2% of all scored CVEs.
What is the CVSS score of CVE-2026-69243?
CVE-2026-69243 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-69243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-69243, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-69243

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