Is CVE-2026-54277 actively exploited?

No active exploitation of CVE-2026-54277 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54277 be exploited remotely?

Yes. CVE-2026-54277 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54277?

CVE-2026-54277 has a CVSS score of 6.6 (MEDIUM).

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MEDIUM

CVE-2026-54277

CWE-770Published: June 22, 2026· Updated: Jun 23, 2026

6.6

CVSS v3.1

EPSS:0.28%probability of exploitation in 30 daysPercentile:19.5th

Official Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. If using the optimised C parser (the default in pre-built wheels), then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.

NVD Source

Technical Analysis

CVE-2026-54277 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X