StackPrism

PyPI package

aiohttp 3.13.4 vulnerabilities, and the version that fixes all of them

aiohttp 3.13.4 has 14 known vulnerabilities (1 rated high or critical); 3.14.3 fixes all of them.

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

Known vulnerabilities
14
1 rated high or critical
Released
Mar 28, 2026
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

What to upgrade to

3.14.3 is the closest release with no known vulnerabilities.

  • 3.14.3Upgrade to this

    Fixes all 14 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 3.13.4

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. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 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 3.13.4, 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.