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CVE-2026-54278 aio-libs CVE debrief

CVE-2026-54278 is a medium-severity vulnerability in AIOHTTP, a Python asynchronous HTTP client/server framework. The issue allows for a potential denial of service (DoS) via decompression of a compressed request body into memory. This vulnerability, described as a 'zip bomb edge case,' can be exploited under specific conditions. The vulnerability was published on June 22, 2026, and patched in version 3.14.1 of AIOHTTP. Users of affected versions should update to 3.14.1 or later to mitigate this vulnerability. The CVSS score for this vulnerability is 6.6, indicating a medium severity level.

Vendor
aio-libs
Product
aiohttp
CVSS
MEDIUM 6.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-22
Original CVE updated
2026-06-26
Advisory published
2026-06-22
Advisory updated
2026-06-26

Who should care

Security teams and developers using AIOHTTP in their applications should be aware of this vulnerability. Given the medium severity and potential for DoS attacks, organizations using AIOHTTP should prioritize patching. This is especially important for environments where AIOHTTP is used to handle untrusted or externally sourced requests.

Technical summary

The vulnerability in AIOHTTP arises from the decompression of compressed request bodies during cleanup. In certain situations, an attacker may be able to send a compressed payload that, when decompressed, could lead to a denial of service. This is considered a 'zip bomb edge case,' where the decompression could potentially consume significant memory. The issue was addressed with the release of AIOHTTP version 3.14.1, which modifies the decompression process to prevent such excessive memory usage. The Common Weakness Enumeration (CWE) associated with this vulnerability is CWE-409.

Defensive priority

Patching to version 3.14.1 or later is strongly recommended. In the absence of an immediate patch, defenders should monitor AIOHTTP usage for unusual patterns that could indicate exploitation attempts.

Recommended defensive actions

  • Update AIOHTTP to version 3.14.1 or later.
  • Monitor AIOHTTP usage for unusual patterns that could indicate exploitation attempts.
  • Review and adjust application configurations to limit the impact of potential decompression attacks.
  • Implement additional security measures, such as rate limiting and IP blocking, to mitigate potential threats.
  • Conduct regular security audits to ensure compliance with best practices.

Evidence notes

The CVE record and NVD detail provide official information about the vulnerability. The source item URL offers additional context from the NVD database. References to mitigation and vendor information are available through GitHub advisories.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54278 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54278

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-54278 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54278

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.