CVE-2026-67339: medium-severity vulnerability in guzzle
guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.4%
guzzlehttp/guzzle versions before 7.14.2 fail to properly isolate Proxy-Authorization headers from origin servers in cURL handlers. Attackers can capture proxy credentials through origin server access logs when requests are redirected, bypassed, or sent through SOCKS proxies that Guzzle misclassifies as direct connections.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
guzzle · guzzleRelated CVEs — guzzle
In the same product, most dangerous first.
CVE-2022-31042HIGHFailure to strip the Cookie header on change in host or HTTP downgrade in GuzzleEPSS 2.0%CVE-2022-31043HIGHFix failure to strip Authorization header on HTTP downgrade in GuzzleEPSS 2.0%CVE-2022-31090HIGHCURLOPT_HTTPAUTH option not cleared on change of origin in GuzzleEPSS 1.9%CVE-2022-31091HIGHChange in port should be considered a change in origin in GuzzleEPSS 1.6%CVE-2022-29248HIGHCross-domain cookie leakage in GuzzleEPSS 1.4%CVE-2026-67353MEDIUMguzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of ServiceEPSS 0.4%