CVE Explorer
CVE-2026-6253
curl might erroneously pass on credentials for a first proxy to a second
proxy.
This can happen when the following conditions are true:
1. curl is setup to use specific different proxies for different URL schemes
2. the first proxy needs credentials
3. the second proxy uses no credentials
4. while using the first proxy (using say `http://`), curl is asked to follow
a redirect to a URL using another scheme (say `https://`), accessed using a
second, different, proxy
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"curl","vendor":"curl","versions":[{"lessThanOrEqual":"8.19.0","status":"affected","version":"8.19.0","versionType":"semver"},{"lessThanOrEqual":"8.18.0","status":"affected","version":"8.18.0","versionType":"semver"},{"lessThanOrEqual":"8.17.0","status":"affected","version":"8.17.0","versionType":"semver"},{"lessThanOrEqual":"8.16.0","status":"affected","version":"8.16.0","versionType":"semver"},{"lessThanOrEqual":"8.15.0","status":"affected","version":"8.15.0","versionType":"semver"},{"lessThanOrEqual":"8.14.1","status":"affected","version":"8.14.1","ve…
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:5e366ab2b3228883a8c4f642059c83bf18b95db78ba7a1f50552aee45546a555 · sha256:26e7a6019914a9c7… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:5e366ab2b3228883a8c4f642059c83bf18b95db78ba7a1f50552aee45546a555 · sha256:26e7a6019914a9c7… · /containers/adp/1/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"description":"CWE-522 Insufficiently Protected Credentials","lang":"en"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:5e366ab2b3228883a8c4f642059c83bf18b95db78ba7a1f50552aee45546a555 · sha256:26e7a6019914a9c7… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"url":"http://www.openwall.com/lists/oss-security/2026/04/29/11"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:5e366ab2b3228883a8c4f642059c83bf18b95db78ba7a1f50552aee45546a555 · sha256:26e7a6019914a9c7… · /containers/adp/0/references/0
{"name":"www","url":"https://curl.se/docs/CVE-2026-6253.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:5e366ab2b3228883a8c4f642059c83bf18b95db78ba7a1f50552aee45546a555 · sha256:26e7a6019914a9c7… · /containers/cna/references/1
{"name":"json","url":"https://curl.se/docs/CVE-2026-6253.json"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:5e366ab2b3228883a8c4f642059c83bf18b95db78ba7a1f50552aee45546a555 · sha256:26e7a6019914a9c7… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://hackerone.com/reports/3669637"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:5e366ab2b3228883a8c4f642059c83bf18b95db78ba7a1f50552aee45546a555 · sha256:26e7a6019914a9c7… · /containers/adp/1/references/0
{"name":"issue","url":"https://hackerone.com/reports/3669637"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:5e366ab2b3228883a8c4f642059c83bf18b95db78ba7a1f50552aee45546a555 · sha256:26e7a6019914a9c7… · /containers/cna/references/2
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.