What is CVE-2026-48998?

CVE-2026-48998 is a medium-severity vulnerability in Guzzle Psr7, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2026-06-11.

How severe is CVE-2026-48998?

Medium severity. CVSS v3 base score is 5.3 out of 10.

SSRF in Guzzle Psr7

CVE-2026-48998

guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Versions prior to 2.10.2 contain improper Host header validation when parsing raw HTTP request messages and when deriving a server request URI from server variables. An…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.002 (9.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Guzzle Psr7 — versions < 2.10.2
Guzzlephp Psr-7

Weakness classification (CWE)

CWE-20 — Improper Input Validation
CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-48998?: CVE-2026-48998 is a medium-severity vulnerability in Guzzle Psr7, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2026-06-11.
How severe is CVE-2026-48998?: Medium severity. CVSS v3 base score is 5.3 out of 10.