Is guzzlehttp/psr7 2.12 vulnerable?

Composer · 6 releases from 2.12.0 to 2.12.5 · latest guzzlehttp/psr7 is 3.2.0 · checked 1 Nov 2026

No known advisories in the last release

guzzlehttp/psr7 2.12.5, the last 2.12 release, has no known advisories. 2 advisories affect earlier 2.12.x releases, so update to 2.12.5.

Update within 2.12:composer require guzzlehttp/psr7:^2.12.5

Is your project affected?

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Fixed within 2.12.x, affecting earlier releases

  • 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 2.12?

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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.