Is guzzlehttp/psr7 2.11 vulnerable?

Composer · 2 releases from 2.11.0 to 2.11.1 · latest guzzlehttp/psr7 is 3.2.0 · checked 2 Nov 2026

Yes: 2 known advisories

Yes. guzzlehttp/psr7 2.11.1, the last 2.11 release, is affected by 2 known security advisories (2 medium), including CVE-2026-59882, CVE-2026-55766. Upgrade to 2.12.3 or later to fix all of them.

Upgrade with:composer require guzzlehttp/psr7:^2.12.3

Is your project affected?

Private repo? Upload its lockfile instead, or connect GitHub to check every repo.

Advisories affecting guzzlehttp/psr7 2.11.1

  • MediumCVE-2026-59882GHSA-c2w2-prh8-qm9821 Jul 2026

    guzzlehttp/psr7: Host Confusion via Weak URI Host Validation

    Affected
    <2.12.3
    Fixed in
    2.12.3
  • MediumCVE-2026-55766GHSA-vm85-hxw5-543219 Jun 2026

    guzzlehttp/psr7: CRLF Injection in HTTP Start-Line Serialization

    Affected
    <2.12.1
    Fixed in
    2.12.1

Which of your client projects are still on guzzlehttp/psr7 2.11?

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Other guzzlehttp/psr7 versions

Advisory data from OSV.dev (opens OSV.dev in a new tab), which includes the GitHub Advisory Database. Release list from the Composer registry. Refreshed daily.