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guzzlehttp/guzzle: Silent HTTPS-Proxy Downgrade to Cleartext

🗓️ 19 Jun 2026 14:17:59Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 10 Views

Guzzle may downgrade https proxy to cleartext with libcurl older than 7.50.2, exposing proxy credentials.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-55568
23 Jun 202614:54
attackerkb
Chainguard
CVE-2026-55568 vulnerabilities
23 Jun 202608:17
cgr
CVE
CVE-2026-55568
23 Jun 202614:54
cve
Cvelist
CVE-2026-55568 Guzzle: Silent HTTPS-Proxy Downgrade to Cleartext
23 Jun 202614:54
cvelist
Debian CVE
CVE-2026-55568
23 Jun 202614:54
debiancve
EUVD
EUVD-2026-38456
23 Jun 202614:54
euvd
Tenable Nessus
Fedora 43 : nextcloud (2026-5afe6630dc)
5 Jul 202600:00
nessus
Tenable Nessus
Fedora 44 : nextcloud (2026-ee50c21f92)
6 Jul 202600:00
nessus
Tenable Nessus
Linux Distros Unpatched Vulnerability : CVE-2026-55568
21 Jun 202600:00
nessus
Friends Of PHP
Silent HTTPS proxy downgrade to cleartext
18 Jun 202614:12
friendsofphp
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Vulners
Node
guzzlehttpguzzleRange<7.12.1composer

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19 Jun 2026 14:18Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.15.9
EPSS0.00106
10