CVE-2026-59882

mediumCVSS 4.2covered by 1 sourcefirst seen 2026-07-08

guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Prior to 2.12.3, Uri::assertValidHost() does not reject URI host components containing authority delimiters, embedded ports, or malformed IPv6 brackets, allowing Uri::getHost() to disagree with the URI authority used for security or routing decisions. This issue is fixed in version 2.12.3.

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Exploitation outlook

Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-59882: guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Prior to 2.12.3, Uri::a…nvd · 2026-07-08

External references

NVD record for CVE-2026-59882

CVE.org record

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