StackPrism

PyPI package

aiohttp 3.11.13 vulnerabilities, and the version that fixes all of them

aiohttp 3.11.13 has 33 known vulnerabilities (2 rated high or critical); 3.14.3 fixes all of them. The maintainers deprecated this release.

PyPI (opens in a new tab) describes it as “Async http client/server framework (asyncio)”

Known vulnerabilities
33
2 rated high or critical
Released
Feb 24, 2025
Latest is 3.14.5
Licence
Apache-2.0 AND MIT
OpenSSF Scorecard
7.3/10
aio-libs/aiohttp (opens in a new tab)
Pulls in
8 packages
Resolved by deps.dev
Status
Yanked release

What to upgrade to

3.14.3 is the closest release with no known vulnerabilities.

  • 3.14.3Upgrade to this

    Fixes all 33 known vulnerabilities. Released Jul 23, 2026.

    No known vulnerabilities

  • 3.14.5

    Newest 3.x release and the latest release. Released Oct 11, 2026.

    No known vulnerabilities

3.14.3 came out on Jul 23, 2026. A coding agent trained before then doesn’t know it exists, so it may suggest an older release. AI knowledge cutoff dates

Hand the fix to your coding agent

One task with the upgrade, the file to change and why. Paste it into Claude Code, Cursor or Codex.

Findings

Every advisory for aiohttp 3.11.13

Known exploited first (CISA KEV), then by how likely they are to be exploited (FIRST EPSS), then by severity. Each id links to its OSV.dev record.

  1. LowCVE-2026-34520 on OSV.dev (opens in a new tab)GHSA-63hf-3vf5-4wqfEPSS: top 49%

    AIOHTTP's C parser (llhttp) accepts null bytes and control characters in response header values - header injection/security bypass

    Fixed in 3.13.4. Published Apr 1, 2026.

  2. WarningCVE-2026-34516 on OSV.dev (opens in a new tab)GHSA-m5qp-6w8w-w647EPSS: top 52%

    AIOHTTP has a Multipart Header Size Bypass

    Fixed in 3.13.4. Published Apr 1, 2026.

  3. LowCVE-2026-34513 on OSV.dev (opens in a new tab)GHSA-hcc4-c3v8-rx92EPSS: top 52%

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

    Fixed in 3.13.4. Published Apr 1, 2026.

  4. CriticalCVE-2025-69223 on OSV.dev (opens in a new tab)GHSA-6mq8-rvhq-8wggEPSS: top 54%

    AIOHTTP's HTTP Parser auto_decompress feature is vulnerable to zip bomb

    Fixed in 3.13.3. Published Jan 5, 2026.

  5. WarningCVE-2026-54277 on OSV.dev (opens in a new tab)GHSA-63hw-fmq6-xxg2EPSS: top 55%

    aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines

    Fixed in 3.14.1. Published Jun 15, 2026.

  6. WarningCVE-2026-54274 on OSV.dev (opens in a new tab)GHSA-xcgm-r5h9-7989EPSS: top 56%

    aiohttp: Incomplete websocket frame payloads bypass memory limits

    Fixed in 3.14.1. Published Jun 15, 2026.

  7. LowCVE-2026-50269 on OSV.dev (opens in a new tab)GHSA-m6qw-4cw2-hm4mEPSS: top 57%

    aiohttp: CRLF injection in multipart headers

    Fixed in 3.14.0. Published Jun 15, 2026.

  8. CriticalCVE-2026-69244 on OSV.dev (opens in a new tab)GHSA-cq5v-8q36-5273EPSS: top 57%

    AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)

    Fixed in 3.14.3. Published Aug 3, 2026.

  9. WarningCVE-2026-59881 on OSV.dev (opens in a new tab)GHSA-mq44-7p77-q5h7EPSS: top 57%

    AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate

    Fixed in 3.14.2. Published Aug 3, 2026.

  10. LowCVE-2026-34517 on OSV.dev (opens in a new tab)GHSA-3wq7-rqq7-wx6jEPSS: top 59%

    AIOHTTP has late size enforcement for non-file multipart fields causes memory DoS

    Fixed in 3.13.4. Published Apr 1, 2026.

  11. WarningCVE-2026-34515 on OSV.dev (opens in a new tab)GHSA-p998-jp59-783mEPSS: top 59%

    AIOHTTP affected by UNC SSRF/NTLMv2 Credential Theft/Local File Read in static resource handler on Windows

    Fixed in 3.13.4. Published Apr 1, 2026.

  12. WarningCVE-2026-34993 on OSV.dev (opens in a new tab)GHSA-jg22-mg44-37j8EPSS: top 59%

    AIOHTTP is Vulnerable to Deserialization of Untrusted Data

    Fixed in 3.14.0. Published Jun 3, 2026.

  13. WarningCVE-2026-54273 on OSV.dev (opens in a new tab)GHSA-4fvr-rgm6-gqmcEPSS: top 60%

    aiohttp: HTTP/1 Pipelined Requests Queue Without Limit

    Fixed in 3.14.1. Published Jun 15, 2026.

  14. WarningCVE-2026-54278 on OSV.dev (opens in a new tab)GHSA-g3cq-j2xw-wf74EPSS: top 60%

    aiohttp: Unread Compressed Request Bodies Bypass client_max_size During Cleanup

    Fixed in 3.14.1. Published Jun 15, 2026.

  15. LowCVE-2026-54279 on OSV.dev (opens in a new tab)GHSA-2fqr-mr3j-6wp8EPSS: top 60%

    aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence

    Fixed in 3.14.1. Published Jun 15, 2026.

  16. LowCVE-2026-54275 on OSV.dev (opens in a new tab)GHSA-4m7w-qmgq-4wj5EPSS: top 61%

    aiohttp: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections

    Fixed in 3.14.1. Published Jun 15, 2026.

  17. LowCVE-2026-54280 on OSV.dev (opens in a new tab)GHSA-9x8q-7h8h-wcw9EPSS: top 62%

    aiohttp: Payload Response Resources Are Not Closed After Mid-Body Disconnect

    Fixed in 3.14.1. Published Jun 15, 2026.

  18. WarningCVE-2026-69243 on OSV.dev (opens in a new tab)GHSA-mfx4-hv73-q22vEPSS: top 63%

    AIOHTTP: HTTP request smuggling via WebSocket upgrade

    Fixed in 3.14.2. Published Aug 3, 2026.

  19. WarningCVE-2026-22815 on OSV.dev (opens in a new tab)GHSA-w2fm-2cpv-w7v5EPSS: top 64%

    aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage

    Fixed in 3.13.4. Published Apr 1, 2026.

  20. WarningCVE-2025-69228 on OSV.dev (opens in a new tab)GHSA-6jhg-hg63-jvvfEPSS: top 67%

    AIOHTTP vulnerable to denial of service through large payloads

    Fixed in 3.13.3. Published Jan 5, 2026.

  21. LowCVE-2026-34518 on OSV.dev (opens in a new tab)GHSA-966j-vmvw-g2g9EPSS: top 67%

    AIOHTTP leaks Cookie and Proxy-Authorization headers on cross-origin redirect

    Fixed in 3.13.4. Published Apr 1, 2026.

  22. WarningCVE-2025-69229 on OSV.dev (opens in a new tab)GHSA-g84x-mcqj-x9qqEPSS: top 67%

    AIOHTTP vulnerable to DoS through chunked messages

    Fixed in 3.13.3. Published Jan 5, 2026.

  23. LowCVE-2026-34519 on OSV.dev (opens in a new tab)GHSA-mwh4-6h8g-pg8wEPSS: top 68%

    AIOHTTP has HTTP response splitting via \r in reason phrase

    Fixed in 3.13.4. Published Apr 1, 2026.

  24. LowCVE-2026-34514 on OSV.dev (opens in a new tab)GHSA-2vrm-gr82-f7m5EPSS: top 68%

    AIOHTTP has CRLF injection through multipart part content type header construction

    Fixed in 3.13.4. Published Apr 1, 2026.

  25. WarningCVE-2025-69227 on OSV.dev (opens in a new tab)GHSA-jj3x-wxrx-4x23EPSS: top 68%

    AIOHTTP vulnerable to DoS when bypassing asserts

    Fixed in 3.13.3. Published Jan 5, 2026.

  26. WarningCVE-2026-34525 on OSV.dev (opens in a new tab)GHSA-c427-h43c-vf67EPSS: top 69%

    AIOHTTP accepts duplicate Host headers

    Fixed in 3.13.4. Published Apr 1, 2026.

  27. LowCVE-2025-69226 on OSV.dev (opens in a new tab)GHSA-54jq-c3m8-4m76EPSS: top 71%

    AIOHTTP vulnerable to brute-force leak of internal static file path components

    Fixed in 3.13.3. Published Jan 5, 2026.

  28. LowCVE-2025-69230 on OSV.dev (opens in a new tab)GHSA-fh55-r93g-j68gEPSS: top 72%

    AIOHTTP Vulnerable to Cookie Parser Warning Storm

    Fixed in 3.13.3. Published Jan 5, 2026.

  29. LowCVE-2025-53643 on OSV.dev (opens in a new tab)GHSA-9548-qrrj-x5pjEPSS: top 73%

    AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections

    Fixed in 3.12.14. Published Jul 14, 2025.

  30. WarningCVE-2026-54276 on OSV.dev (opens in a new tab)GHSA-hpj7-wq8m-9hgpEPSS: top 79%

    aiohttp: DigestAuthMiddleware Applies Credentials to Cross-Origin Redirect Challenges

    Fixed in 3.14.1. Published Jun 15, 2026.

  31. LowCVE-2025-69225 on OSV.dev (opens in a new tab)GHSA-mqqc-3gqh-h2x8EPSS: top 81%

    AIOHTTP has unicode match groups in regexes for ASCII protocol elements

    Fixed in 3.13.3. Published Jan 5, 2026.

  32. LowCVE-2025-69224 on OSV.dev (opens in a new tab)GHSA-69f9-5gxw-wvc2EPSS: top 85%

    AIOHTTP's unicode processing of header values could cause parsing discrepancies

    Fixed in 3.13.3. Published Jan 5, 2026.

  33. WarningCVE-2026-47265 on OSV.dev (opens in a new tab)GHSA-hg6j-4rv6-33pgEPSS: top 90%

    AIOHTTP is vulnerable to cross-origin redirect with per-request cookies

    Fixed in 3.14.0. Published Jun 3, 2026.

Is aiohttp the only one?

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How this page is checked

StackPrism asks OSV.dev which advisories affect exactly aiohttp 3.11.13, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and PyPI. No AI writes this page: every sentence comes from that data, refreshed every few hours.

Last checked against PyPI, OSV.dev, deps.dev, CISA KEV and FIRST EPSS.