{"id":"CVE-2026-15442","title":"In all builds that make use of (D)TLS, including default builds, there is a series of conditional states during the TLS shutdown which could lead to a heap-use-after free","summary":"In all builds that make use of (D)TLS, including default builds, there is a series of conditional states during the TLS shutdown which could lead to a heap-use-after free. If an application ended up getting a partial wolfSSL_read() which…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-416"],"vendor":"wolfssl","product":"wolfssl","affected":["wolfssl >= 4.4.0, <= 5.9.2"],"published":"2026-09-27","updated":"2026-10-02","sourceUpdated":"2026-10-02T18:58:59.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-15442","references":[{"url":"https://github.com/wolfSSL/wolfssl/pull/10863","label":"facts@wolfssl.com"}],"tags":["nvd","cve.org","score-dispute"],"epss":0.00207,"epssPercentile":0.10735,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-30T10:47:12.677039Z"},"scores":{"nvd":5.3,"cna":2.3},"ingestedAt":"2026-09-27T09:45:46.029Z","slug":"CVE-2026-15442","body":"## Overview\n\nIn all builds that make use of (D)TLS, including default builds, there is a series of conditional states during the TLS shutdown which could lead to a heap-use-after free. If an application ended up getting a partial wolfSSL_read() which is sometimes caused by a small user buffer  passed in, then called wolfSSL_shutdown for a bidirectional close and attempted to wolfSSL_read() again while the peer continues trying to send data during the shutdown it would lead to a state where a potential heap-use-after free happened.\n\n## Affected\n\n- `wolfssl >= 4.4.0, <= 5.9.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":215097,"id":"CVE-2026-15442","ts":1790980437665,"field":"cvss","old":"2.3","new":"5.3"},{"seq":215096,"id":"CVE-2026-15442","ts":1790980437665,"field":"severity","old":"low","new":"medium"}]}