CVE Explorer

CVE-2026-3547

Out-of-bounds read in ALPN parsing due to incomplete validation. wolfSSL 5.8.4 and earlier contained an out-of-bounds read in ALPN handling when built with ALPN enabled (HAVE_ALPN / --enable-alpn). A crafted ALPN protocol list could trigger an out-of-bounds read, leading to a potential process crash (denial of service). Note that ALPN is disabled by default, but is enabled for these 3rd party compatibility features: enable-apachehttpd, enable-bind, enable-curl, enable-haproxy, enable-hitch, enab

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f808d6eba70ba944aea803e05e324f621dd5cc26acad6aa1974be4fac394956d

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","platforms":["ALPN-enabled builds (HAVE_ALPN / --enable-alpn)"],"product":"wolfSSL","vendor":"wolfSSL","versions":[{"lessThan":"5.9.0","status":"affected","version":"0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:fad1708ce232bb1e21ba75c2b1aa7d0d29dd80c11b78f540ddf98ce0c8fd8ea0 · sha256:2d33df14174e5d24… · /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:fad1708ce232bb1e21ba75c2b1aa7d0d29dd80c11b78f540ddf98ce0c8fd8ea0 · sha256:2d33df14174e5d24… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-125","description":"CWE-125: out-of-bounds read","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:fad1708ce232bb1e21ba75c2b1aa7d0d29dd80c11b78f540ddf98ce0c8fd8ea0 · sha256:2d33df14174e5d24… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"tags":["patch"],"url":"https://github.com/wolfSSL/wolfssl/pull/9859"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:fad1708ce232bb1e21ba75c2b1aa7d0d29dd80c11b78f540ddf98ce0c8fd8ea0 · sha256:2d33df14174e5d24… · /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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