Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-45541

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a NULL-pointer dereference exists in the WebSocket subprotocol-negotiation path of the esp_http_server component. While parsing the client-supplied Sec-WebSocket-Protocol request header during the WebSocket handshake, the tokenisation result is dereferenced without a NULL check, so a malformed header value can crash the server before any application-level authentication runs.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:700c4f11a7055b25c66bf20f9158abb957f2100f4a13be377bb28c68012e9d5b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"esp-idf","vendor":"espressif","versions":[{"status":"affected","version":"= 6.0"},{"status":"affected","version":"= 5.5.4"},{"status":"affected","version":"= 5.4.4"},{"status":"affected","version":"= 5.3.5"},{"status":"affected","version":"= 5.2.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"name":"https://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8","tags":["x_refsource_MISC"],"url":"https://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/references/1
{"name":"https://github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6","tags":["x_refsource_MISC"],"url":"https://github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/references/2
{"name":"https://github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7","tags":["x_refsource_MISC"],"url":"https://github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/references/3
{"name":"https://github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b","tags":["x_refsource_MISC"],"url":"https://github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/references/4
{"name":"https://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff","tags":["x_refsource_MISC"],"url":"https://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/references/5
{"name":"https://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6","tags":["x_refsource_MISC"],"url":"https://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /containers/cna/references/6
{"name":"https://github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11dd07d3d8a5f284e8e0ad1c8ae1e05499aedea70e6842404c2df309729a7ee6 · sha256:70979a25ff31280c… · /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.

← Back to CVE Explorer