CVE Explorer
CVE-2026-5545
libcurl might in some circumstances reuse the wrong connection when asked to
do an authenticated HTTP(S) request after a Negotiate-authenticated one, when
both use the same host.
libcurl features a pool of recent connections so that subsequent requests can
reuse an existing connection to avoid overhead.
When reusing a connection a range of criteria must be met. Due to a logical
error in the code, a request that was issued by an application could
wrongfully reuse an existing connection to the s
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:v2:57fd89fa333b79c4cdc107cb0943dd590488b4711bbd69b380fd2e52b6e44328 · sha256:1cdbda2488b86784… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:57fd89fa333b79c4cdc107cb0943dd590488b4711bbd69b380fd2e52b6e44328 · sha256:1cdbda2488b86784… · /containers/adp/0/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"description":"CWE-305 Authentication Bypass by Primary Weakness","lang":"en"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:57fd89fa333b79c4cdc107cb0943dd590488b4711bbd69b380fd2e52b6e44328 · sha256:1cdbda2488b86784… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"www","url":"https://curl.se/docs/CVE-2026-5545.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:57fd89fa333b79c4cdc107cb0943dd590488b4711bbd69b380fd2e52b6e44328 · sha256:1cdbda2488b86784… · /containers/cna/references/1
{"name":"json","url":"https://curl.se/docs/CVE-2026-5545.json"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:57fd89fa333b79c4cdc107cb0943dd590488b4711bbd69b380fd2e52b6e44328 · sha256:1cdbda2488b86784… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://hackerone.com/reports/3642555"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:57fd89fa333b79c4cdc107cb0943dd590488b4711bbd69b380fd2e52b6e44328 · sha256:1cdbda2488b86784… · /containers/adp/0/references/0
{"name":"issue","url":"https://hackerone.com/reports/3642555"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:57fd89fa333b79c4cdc107cb0943dd590488b4711bbd69b380fd2e52b6e44328 · sha256:1cdbda2488b86784… · /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.