How severe is GHSA-hcc4-c3v8-rx92?

No CVSS score has been assigned to GHSA-hcc4-c3v8-rx92 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-hcc4-c3v8-rx92?

GHSA-hcc4-c3v8-rx92 affects the following packages: aiohttp (PyPI). Ecosystems affected: PyPI.

How do I fix GHSA-hcc4-c3v8-rx92?

Update aiohttp to 3.13.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hcc4-c3v8-rx92 is resolved across your whole dependency graph.

How do I detect GHSA-hcc4-c3v8-rx92 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for aiohttp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-hcc4-c3v8-rx92 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-hcc4-c3v8-rx92?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-hcc4-c3v8-rx92 can be triaged on real exposure rather than presence alone.

Is GHSA-hcc4-c3v8-rx92 actively exploited in the wild?

No public exploit code has been indexed for GHSA-hcc4-c3v8-rx92 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-hcc4-c3v8-rx92?

GHSA-hcc4-c3v8-rx92 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 38th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-hcc4-c3v8-rx92?

GHSA-hcc4-c3v8-rx92 is classified as CWE-770 (CWE-770). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-hcc4-c3v8-rx92 published, and has it been updated?

GHSA-hcc4-c3v8-rx92 was published on April 1, 2026 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

GHSA-hcc4-c3v8-rx92 — aiohttp

Fix: aio-libs/aiohttp@c4d77c3

GHSA-hcc4-c3v8-rx92 is a CWE-770 vulnerability in aiohttp. A fix is available for aiohttp — see the affected versions and patch details below.

AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector

Also known asCVE-2026-34513PYSEC-2026-2095

Published

Apr 1, 2026

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs38th percentile — riskier than 38% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected

🐍aiohttp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Summary

An unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation.

Impact

If an application makes requests to a very large number of hosts, this could cause the DNS cache to continue growing and slowly use excessive amounts of memory.

Patch: https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`aiohttp`	all versions	3.13.4`pip install --upgrade 'aiohttp==3.13.4'`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for aiohttp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update aiohttp to 3.13.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hcc4-c3v8-rx92 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-hcc4-c3v8-rx92 can be triaged on real exposure rather than presence alone.

Tailored to GHSA-hcc4-c3v8-rx92. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

UbuntuHIGH

USN-8591-1Ubuntu

Frequently Asked Questions

### Summary An unbounded DNS cache could result in excessive memory usage possibly resulting in a DoS situation. ### Impact If an application makes requests to a very large number of hosts, this could cause the DNS cache to continue growing and slowly use excessive amounts of memory. ----- Patch: https://github.com/aio-libs/aiohttp/commit/c4d77c3533122be353b8afca8e8675e3b4cbda98

O3 Security · Impact-Aware SCA

Is GHSA-hcc4-c3v8-rx92 in your dependencies?

O3 Security finds GHSA-hcc4-c3v8-rx92 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works