PHP package security

Is guzzlehttp/psr7 vulnerable?

Q: Does guzzlehttp/psr7 have known vulnerabilities?

Yes. Packagist lists 6 security advisories for guzzlehttp/psr7 (6 medium severity). The most recent, reported 2026-07-21, is "guzzlehttp/psr7: Host Confusion via Weak URI Host Validation". The newest release, 3.2.0, is outside every affected range.

Q: Which version of guzzlehttp/psr7 should I run?

The newest stable release is 3.2.0 (published 2026-10-17). The most recent advisory is fixed in 2.12.3, so stay on or above the fixed version for your major version. Run composer update guzzlehttp/psr7, then composer audit to confirm nothing else is flagged.

Q: How do I check if my guzzlehttp/psr7 version is affected?

Run composer show guzzlehttp/psr7 in your project to see the installed version, then enter it in the version check on this page. You can also run composer audit, which reads the same Packagist advisory data for every package in your composer.lock.

6 known security advisories for guzzlehttp/psr7. The latest was reported on 2026-07-21 and is fixed in 2.12.3. The newest release, 3.2.0, is not affected by any of them.

6 medium

Known advisories: 6
Newest release: 3.2.0
Released: 2026-10-17
Affecting newest release: 0
Last synced: 2026-11-03

PSR-7 message implementation that also provides common utility methods · packagist.org/packages/guzzlehttp/psr7

Check your version

Run composer show guzzlehttp/psr7 in your project to see the installed version, then enter it here.

Security advisories for guzzlehttp/psr7

Newest first. “Affected” is the Composer version constraint from the advisory; “fixed in” is each version the advisory names as the first safe one on its release line.

Reported	Advisory	Severity	Affected	Fixed in
2026-07-21	guzzlehttp/psr7: Host Confusion via Weak URI Host Validation GHSA-c2w2-prh8-qm98 · CVE-2026-59882 · GitHub	medium	<2.12.3	2.12.3
2026-06-18	CRLF injection in HTTP start-line serialization CVE-2026-55766 · GitHub, FriendsOfPHP/security-advisories	medium	<2.12.1	2.12.1
2026-05-25	Host confusion via authority reinterpretation CVE-2026-48998 · GitHub, FriendsOfPHP/security-advisories	medium	<2.10.2	2.10.2
2026-05-25	CRLF injection via URI host component CVE-2026-49214 · GitHub, FriendsOfPHP/security-advisories	medium	<2.10.2	2.10.2
2023-04-17	Improper header validation CVE-2023-29197 · GitHub, FriendsOfPHP/security-advisories	medium	>=2,<2.4.5 \| <1.9.1	1.9.1, 2.4.5
2022-03-20	Inproper parsing of HTTP headers CVE-2022-24775 · GitHub, FriendsOfPHP/security-advisories	medium	>=2,<2.1.1 \| <1.8.4	1.8.4, 2.1.1

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Questions about guzzlehttp/psr7

Does guzzlehttp/psr7 have known vulnerabilities?

Yes. Packagist lists 6 security advisories for guzzlehttp/psr7 (6 medium severity). The most recent, reported 2026-07-21, is "guzzlehttp/psr7: Host Confusion via Weak URI Host Validation". The newest release, 3.2.0, is outside every affected range.

Which version of guzzlehttp/psr7 should I run?

The newest stable release is 3.2.0 (published 2026-10-17). The most recent advisory is fixed in 2.12.3, so stay on or above the fixed version for your major version. Run composer update guzzlehttp/psr7, then composer audit to confirm nothing else is flagged.

How do I check if my guzzlehttp/psr7 version is affected?

Run composer show guzzlehttp/psr7 in your project to see the installed version, then enter it in the version check on this page. You can also run composer audit, which reads the same Packagist advisory data for every package in your composer.lock.

Where this data comes from

Advisories come from the Packagist security advisories API, which collects the GitHub Advisory Database and the FriendsOfPHP security advisories. composer audit reads the same data. Releases come from packagist.org. Last synced 2026-11-03; we re-check daily. Each advisory links to its source. Spot an error? Tell us.

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