{"id":"CVE-2026-45447","title":"Issue summary: A specially crafted PKCS#7 or S/MIME signed message could\ntrigger a use-after-free during PKCS#7 signature verification.\n\nImpact summary: A use-after-free may result in process crashes, heap\ncorruption, or potentially remo…","summary":"Issue summary: A specially crafted PKCS#7 or S/MIME signed message could\ntrigger a use-after-free during PKCS#7 signature verification.\n\nImpact summary: A use-after-free may result in process crashes, heap\ncorruption, or potentially remo…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-825"],"vendor":"openssl","product":"openssl","affected":["openssl >= 1.0.2, < 1.0.2zq","openssl >= 1.1.1, < 1.1.1zh","openssl >= 3.0.0, < 3.0.21","openssl >= 3.4.0, < 3.4.6","openssl >= 3.5.0, < 3.5.7","openssl >= 3.6.0, < 3.6.3","openssl = 4.0.0"],"patched":["openssl 3.6.3"],"published":"2026-06-09","updated":"2026-09-18","sourceUpdated":"2026-09-18T13:18:26.343","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45447","references":[{"url":"https://github.com/openssl/openssl/commit/3aad5eb7af4de4ee0633c30a8541a54d9bbde63c","label":"openssl-security@openssl.org"},{"url":"https://github.com/openssl/openssl/commit/7d4a980c62258c5910cc883936e0c8dbab4d75a8","label":"openssl-security@openssl.org"},{"url":"https://github.com/openssl/openssl/commit/9dfd688ad2290fc5075cacbc9bf0c9a93eefed54","label":"openssl-security@openssl.org"},{"url":"https://github.com/openssl/openssl/commit/a541ae8bfe849a30cc885e8780715c0f488e496c","label":"openssl-security@openssl.org"},{"url":"https://github.com/openssl/openssl/commit/c505d7559da5d5f9f2c3913c6883a5562ce7273e","label":"openssl-security@openssl.org"},{"url":"https://openssl-library.org/news/secadv/20260609.txt","label":"openssl-security@openssl.org"},{"url":"https://access.redhat.com/errata/RHSA-2026:25237","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25239","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26275","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26319","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:29197","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34102","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:35869","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36215","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36217","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:39009","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:39012","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:39981","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:44438","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:47735","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:47737","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:58563","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:58981","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:59831","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:66524","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-45447","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2481898","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45447.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45447"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45447"},{"url":"https://access.redhat.com/errata/RHSA-2026:67551"},{"url":"https://access.redhat.com/errata/RHSA-2026:42825"},{"url":"https://access.redhat.com/errata/RHSA-2026:59641"},{"url":"https://access.redhat.com/errata/RHSA-2026:59635"},{"url":"https://access.redhat.com/errata/RHSA-2026:55543"},{"url":"https://access.redhat.com/errata/RHSA-2026:62562"},{"url":"https://access.redhat.com/errata/RHSA-2026:62790"},{"url":"https://access.redhat.com/errata/RHSA-2026:62563"}],"tags":["nvd","exploit-available","cve.org","csaf","vex","red-hat"],"epss":0.03566,"epssPercentile":0.88852,"exploits":{"github":2,"githubRepos":["https://github.com/0xBlackash/CVE-2026-45447","https://github.com/HORKimhab/CVE-2026-45447"],"checkedAt":"2026-09-21T15:29:06.777Z"},"exploitAvailable":true,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-06-10T03:59:38.212378Z"},"scores":{"nvd":8.8,"vendor":8.1,"adp":8.8},"ingestedAt":"2026-07-06T17:44:51.182Z","slug":"CVE-2026-45447","body":"## Overview\n\nIssue summary: A specially crafted PKCS#7 or S/MIME signed message could\ntrigger a use-after-free during PKCS#7 signature verification.\n\nImpact summary: A use-after-free may result in process crashes, heap\ncorruption, or potentially remote code execution.\n\nWhen processing a PKCS#7 or S/MIME signed message, if the SignedData\ndigestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may\nincorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent\nuse of the BIO by the calling application results in a use-after-free\ncondition.\n\nIn the common case this occurs when the application later calls\nBIO_free() on the BIO originally passed to PKCS7_verify(). Depending\non allocator behavior and application-specific BIO usage patterns, this\nmay result in a crash or other memory corruption. In some application\ncontexts this may potentially be exploitable for remote code execution.\n\nApplications that process PKCS#7 or S/MIME signed messages using OpenSSL\nPKCS#7 APIs may be affected. Applications using the CMS APIs for this\nprocessing are not affected.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\nissue, as the affected code is outside the OpenSSL FIPS module boundary.\n\n## Affected\n\n- `openssl >= 1.0.2, < 1.0.2zq`\n- `openssl >= 1.1.1, < 1.1.1zh`\n- `openssl >= 3.0.0, < 3.0.21`\n- `openssl >= 3.4.0, < 3.4.6`\n- `openssl >= 3.5.0, < 3.5.7`\n- `openssl >= 3.6.0, < 3.6.3`\n- `openssl = 4.0.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `openssl 3.6.3`\n\n## Vendor advisories\n\n- **RHSA-2026:66524** · Red Hat · fixed in: Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION), Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) · released 2026-09-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:66524)\n- **RHSA-2026:58563** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58563)\n- **RHSA-2026:59831** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:59831)\n- **RHSA-2026:25237** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-06-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:25237)\n- **RHSA-2026:36215** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-07-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:36215)\n- **RHSA-2026:36217** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-07-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:36217)\n- **RHSA-2026:39012** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:39012)\n- **RHSA-2026:39009** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:39009)\n- **RHSA-2026:35869** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:35869)\n- **RHSA-2026:44438** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:44438)\n- **RHSA-2026:25239** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-06-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:25239)\n- **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4, Multicluster Engine for Kubernetes · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45447.json)","depth":"midnight","depthScore":61,"depthScoreParts":{"impact":48.4,"likelihood":0.7,"exploitation":12,"ransomware":0},"changes":[{"seq":5238,"id":"CVE-2026-45447","ts":1788887255554,"field":"exploit_available","old":"false","new":"true"},{"seq":4121,"id":"CVE-2026-45447","ts":1788886372367,"field":"exploit_available","old":"true","new":"false"},{"seq":2894,"id":"CVE-2026-45447","ts":1788883037817,"field":"exploit_available","old":"false","new":"true"},{"seq":1923,"id":"CVE-2026-45447","ts":1788882441274,"field":"exploit_available","old":"true","new":"false"},{"seq":1012,"id":"CVE-2026-45447","ts":1788881876143,"field":"exploit_available","old":"false","new":"true"}]}