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CVE-2026-55568

Guzzle is an extensible PHP HTTP client. Prior to 7.12.1, in certain configurations, traffic expected to be protected by TLS on the hop to the proxy is transmitted in cleartext. Proxy authentication credentials (the Proxy-Authorization header, proxy userinfo in the proxy URL, or CURLOPT_PROXYUSERPWD) are sent without encryption, and the CONNECT target host and port for tunneled HTTPS requests are exposed. The built-in cURL handlers (GuzzleHttp\Handler\CurlHandler and GuzzleHttp\Handler\CurlMulti
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cdbb9cb04fbfac596f9f714ebf6c58e3515cbcc510dc3afd77948a67145adf23
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-636","description":"CWE-636: Not Failing Securely ('Failing Open')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-319","description":"CWE-319: Cleartext Transmission of Sensitive Information","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-311","description":"CWE-311: Missing Encryption of Sensitive Data","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"guzzle","vendor":"guzzle","versions":[{"status":"affected","version":"< 7.12.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-636","description":"CWE-636: Not Failing Securely ('Failing Open')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-319","description":"CWE-319: Cleartext Transmission of Sensitive Information","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-311","description":"CWE-311: Missing Encryption of Sensitive Data","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/guzzle/guzzle/security/advisories/GHSA-wpwq-4j6v-78m3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-wpwq-4j6v-78m3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b58c0d3dece42f41042a25644c2f3bf5ab1d36023083b3952e18588e89d9a167 · sha256:bcafe80799178676… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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