# Aiohttp vulnerabilities

Source: https://junglewise.ai/threats/vendors/aiohttp  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/aiohttp.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 16 vulnerabilities in Aiohttp: 0 in the last 7 days and 0 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-34525, was published on 1 April 2026. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 16 (1 critical, 0 exploited in the wild)

## About Aiohttp

Python asynchronous HTTP client and server library for building async web applications.

## Latest Aiohttp vulnerabilities

- [CVE-2026-34525: AIOHTTP accepts duplicate Host headers](https://junglewise.ai/threats/cve-2026-34525-aiohttp-accepts-duplicate-host-headers) (medium, CVSS 5.3, published 1 Apr 2026)
- [CVE-2026-34520: aio-libs aiohttp header injection in llhttp C parser](https://junglewise.ai/threats/cve-2026-34520-aio-libs-aiohttp-header-injection-in-llhttp-c-parser) (critical, CVSS 9.1, published 1 Apr 2026)
- [CVE-2026-34519: AIOHTTP has HTTP response splitting via \r in reason phrase](https://junglewise.ai/threats/cve-2026-34519-aiohttp-has-http-response-splitting-via-r-in-reason-phrase) (medium, CVSS 5.3, published 1 Apr 2026)
- [CVE-2026-34518: AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin redirect](https://junglewise.ai/threats/cve-2026-34518-aiohttp-leaks-cookie-and-proxy-authorization-headers-on-cross) (medium, CVSS 5.3, published 1 Apr 2026)
- [CVE-2026-34517: AIOHTTP has late size enforcement for non-file multipart fields causes memory DoS](https://junglewise.ai/threats/cve-2026-34517-aiohttp-has-late-size-enforcement-for-non-file-multipart-fields) (medium, CVSS 5.3, published 1 Apr 2026)
- [CVE-2026-34516: AIOHTTP has a Multipart Header Size Bypass](https://junglewise.ai/threats/cve-2026-34516-aiohttp-has-a-multipart-header-size-bypass) (high, CVSS 7.5, published 1 Apr 2026)
- [CVE-2026-34515: AIOHTTP affected by UNC SSRF/NTLMv2 Credential Theft/Local File Read in static resource handler on Windows](https://junglewise.ai/threats/cve-2026-34515-aiohttp-affected-by-unc-ssrf-ntlmv2-credential-theft-local-file) (high, CVSS 7.5, published 1 Apr 2026)
- [CVE-2026-34514: aiohttp CRLF injection in multipart content type header](https://junglewise.ai/threats/cve-2026-34514-aiohttp-crlf-injection-in-multipart-content-type-header) (medium, CVSS 5.3, published 1 Apr 2026)
- [CVE-2026-34513: AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector](https://junglewise.ai/threats/cve-2026-34513-aiohttp-affected-by-denial-of-service-dos-via-unbounded-dns-cache) (high, CVSS 7.5, published 1 Apr 2026)
- [CVE-2026-22815: aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage](https://junglewise.ai/threats/cve-2026-22815-aiohttp-allows-unlimited-trailer-headers-leading-to-possible) (high, CVSS 7.5, published 1 Apr 2026)
- [CVE-2025-69229: PYSEC-2026-1106 - AIOHTTP vulnerable to DoS through chunked messages](https://junglewise.ai/threats/cve-2025-69229-aiohttp-vulnerable-to-dos-through-chunked-messages) (medium, CVSS 5.3, published 6 Jan 2026)
- [CVE-2025-69228: PYSEC-2026-1100 - AIOHTTP vulnerable to denial of service through large payloads](https://junglewise.ai/threats/cve-2025-69228-aiohttp-vulnerable-to-denial-of-service-through-large-payloads) (high, CVSS 7.5, published 6 Jan 2026)
- [CVE-2025-69227: PYSEC-2026-1107 - AIOHTTP vulnerable to DoS when bypassing asserts](https://junglewise.ai/threats/cve-2025-69227-aiohttp-vulnerable-to-dos-when-bypassing-asserts) (high, CVSS 7.5, published 6 Jan 2026)
- [CVE-2025-69225: PYSEC-2026-1109 - AIOHTTP has unicode match groups in regexes for ASCII protocol elements](https://junglewise.ai/threats/cve-2025-69225-aiohttp-has-unicode-match-groups-in-regexes-for-ascii-protocol) (medium, CVSS 5.3, published 6 Jan 2026)
- [CVE-2025-69226: PYSEC-2026-1097 - AIOHTTP vulnerable to brute-force leak of internal static file path components](https://junglewise.ai/threats/cve-2025-69226-aiohttp-vulnerable-to-brute-force-leak-of-internal-static-le-path) (medium, CVSS 5.3, published 5 Jan 2026)
- [CVE-2025-69224: PYSEC-2026-1099 - AIOHTTP's unicode processing of header values could cause parsing discrepancies](https://junglewise.ai/threats/cve-2025-69224-aiohttp-s-unicode-processing-of-header-values-could-cause-parsing) (medium, CVSS 6.5, published 5 Jan 2026)

## Most severe Aiohttp vulnerabilities

- [CVE-2026-34520: aio-libs aiohttp header injection in llhttp C parser](https://junglewise.ai/threats/cve-2026-34520-aio-libs-aiohttp-header-injection-in-llhttp-c-parser) (critical, CVSS 9.1, published 1 Apr 2026)
- [CVE-2026-34516: AIOHTTP has a Multipart Header Size Bypass](https://junglewise.ai/threats/cve-2026-34516-aiohttp-has-a-multipart-header-size-bypass) (high, CVSS 7.5, published 1 Apr 2026)
- [CVE-2026-34513: AIOHTTP Affected by Denial of Service (DoS) via Unbounded DNS Cache in TCPConnector](https://junglewise.ai/threats/cve-2026-34513-aiohttp-affected-by-denial-of-service-dos-via-unbounded-dns-cache) (high, CVSS 7.5, published 1 Apr 2026)
- [CVE-2026-22815: aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage](https://junglewise.ai/threats/cve-2026-22815-aiohttp-allows-unlimited-trailer-headers-leading-to-possible) (high, CVSS 7.5, published 1 Apr 2026)
- [CVE-2026-34515: AIOHTTP affected by UNC SSRF/NTLMv2 Credential Theft/Local File Read in static resource handler on Windows](https://junglewise.ai/threats/cve-2026-34515-aiohttp-affected-by-unc-ssrf-ntlmv2-credential-theft-local-file) (high, CVSS 7.5, published 1 Apr 2026)
- [CVE-2025-69228: PYSEC-2026-1100 - AIOHTTP vulnerable to denial of service through large payloads](https://junglewise.ai/threats/cve-2025-69228-aiohttp-vulnerable-to-denial-of-service-through-large-payloads) (high, CVSS 7.5, published 6 Jan 2026)
- [CVE-2025-69227: PYSEC-2026-1107 - AIOHTTP vulnerable to DoS when bypassing asserts](https://junglewise.ai/threats/cve-2025-69227-aiohttp-vulnerable-to-dos-when-bypassing-asserts) (high, CVSS 7.5, published 6 Jan 2026)
- [CVE-2025-69224: PYSEC-2026-1099 - AIOHTTP's unicode processing of header values could cause parsing discrepancies](https://junglewise.ai/threats/cve-2025-69224-aiohttp-s-unicode-processing-of-header-values-could-cause-parsing) (medium, CVSS 6.5, published 5 Jan 2026)
- [CVE-2025-69229: PYSEC-2026-1106 - AIOHTTP vulnerable to DoS through chunked messages](https://junglewise.ai/threats/cve-2025-69229-aiohttp-vulnerable-to-dos-through-chunked-messages) (medium, CVSS 5.3, published 6 Jan 2026)
- [CVE-2026-34517: AIOHTTP has late size enforcement for non-file multipart fields causes memory DoS](https://junglewise.ai/threats/cve-2026-34517-aiohttp-has-late-size-enforcement-for-non-file-multipart-fields) (medium, CVSS 5.3, published 1 Apr 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Aiohttp technologies

- [Aiohttp](https://junglewise.ai/threats/technologies/aiohttp-aiohttp): 16 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Aiohttp vulnerabilities", https://junglewise.ai/threats/vendors/aiohttp, 9 November 2026.