CVE Explorer
CVE-2026-9546
A vulnerability in libcurl caused the HTTP `Referer:` header to persist even
when explicitly cleared. While the documentation states that passing NULL to
`CURLOPT_REFERER` suppresses the header, the option failed to clear the
internal state. As a result the previous referrer string was erroneously
reused and sent in subsequent requests, potentially leaking sensitive
information to unintended servers.
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":"8.20.0","status":"affected","version":"8.20.0","versionType":"semver"},{"lessThanOrEqual":"8.19.0","status":"affected","version":"8.19.0","versionType":"semver"},{"lessThanOrEqual":"8.18.0","status":"affected","version":"8.18.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:08f628e7e6a6a29a52e87d6246a4a6ff73631bbf5d1a4fb35df6a4f7b8f77234 · sha256:02897a1d6ee5dac9… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:08f628e7e6a6a29a52e87d6246a4a6ff73631bbf5d1a4fb35df6a4f7b8f77234 · sha256:02897a1d6ee5dac9… · /containers/adp/0/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","lang":"en"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:08f628e7e6a6a29a52e87d6246a4a6ff73631bbf5d1a4fb35df6a4f7b8f77234 · sha256:02897a1d6ee5dac9… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"www","url":"https://curl.se/docs/CVE-2026-9546.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:08f628e7e6a6a29a52e87d6246a4a6ff73631bbf5d1a4fb35df6a4f7b8f77234 · sha256:02897a1d6ee5dac9… · /containers/cna/references/1
{"name":"json","url":"https://curl.se/docs/CVE-2026-9546.json"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:08f628e7e6a6a29a52e87d6246a4a6ff73631bbf5d1a4fb35df6a4f7b8f77234 · sha256:02897a1d6ee5dac9… · /containers/cna/references/0
{"name":"issue","url":"https://hackerone.com/reports/3754343"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:08f628e7e6a6a29a52e87d6246a4a6ff73631bbf5d1a4fb35df6a4f7b8f77234 · sha256:02897a1d6ee5dac9… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://hackerone.com/reports/3754343"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:08f628e7e6a6a29a52e87d6246a4a6ff73631bbf5d1a4fb35df6a4f7b8f77234 · sha256:02897a1d6ee5dac9… · /containers/adp/0/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.