CVE-2026-45447

Highest-risk unexploited with PoCs

Exploit code exists, no confirmed in-the-wild activity, ranked by EPSS

Actively Exploited

Confirmed exploited in the wild, sorted by most recently updated

CVSS 8.8EPSS 4%

Published 2026-06-09Updated 2026-06-11

PoC

Vulnerability details

Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification. Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution. When processing a PKCS#7 or S/MIME signed message, if the SignedData digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent use of the BIO by the calling application results in a use-after-free condition. In the common case this occurs when the application later calls BIO_free() on the BIO originally passed to PKCS7_verify(). Depending on allocator behavior and application-specific BIO usage patterns, this may result in a crash or other memory corruption. In some application contexts this may potentially be exploitable for remote code execution. Applications that process PKCS#7 or S/MIME signed messages using OpenSSL PKCS#7 APIs may be affected. Applications using the CMS APIs for this processing are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CNAopenssl

EPSS score history

Sources

4 links

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CVE Organization RedHat Vuln DB The Hacker News NVD Analysis

Profile

CVSS

8.8

EPSS

Published

2026-06-09

Updated

2026-06-11

CNA

openssl

Vendors

OpenSSL

1 product

CPEs

cpe:/o:redhat:enterprise_linux:10.2

cpe:/a:redhat:enterprise_linux:9::appstream

cpe:/o:redhat:enterprise_linux:8::baseos

cpe:/o:redhat:rhel_eus_long_life:8.6::baseos

cpe:/o:redhat:rhel_e4s:8.8::baseos

cpe:/o:redhat:rhel_tus:8.8::baseos

cpe:/o:redhat:enterprise_linux:9::baseos

cpe:/a:redhat:discovery:2::el9

cpe:/a:redhat:rhui:5::el9

cpe:/o:redhat:enterprise_linux:6

cpe:/o:redhat:enterprise_linux:7

cpe:/o:redhat:enterprise_linux:8

cpe:/o:redhat:enterprise_linux:9

cpe:/a:redhat:openshift:4

cpe:/o:redhat:enterprise_linux:10

cpe:/a:redhat:insights_proxy:1.5::el9

cpe:/a:redhat:rhel_eus:9.6::appstream

cpe:/a:redhat:enterprise_linux:8::appstream

cpe:/a:redhat:rhel_e4s:8.8::appstream

cpe:/a:redhat:rhel_tus:8.8::appstream

cpe:/a:redhat:rhel_e4s:9.2::appstream

cpe:/a:redhat:rhel_e4s:9.4::appstream

cpe:/a:redhat:enterprise_linux:8

cpe:/o:redhat:rhel_eus_long_life:8.6

cpe:/a:redhat:rhel_tus:8.8

cpe:/o:redhat:rhel_tus:8.8

cpe:/a:redhat:rhel_e4s:8.8

cpe:/o:redhat:rhel_e4s:8.8

cpe:/a:redhat:enterprise_linux:9

cpe:/a:redhat:rhel_e4s:9.2

cpe:/a:redhat:rhel_e4s:9.4

cpe:/a:redhat:rhel_eus:9.6

cpe:/a:redhat:multicluster_engine

cpe:/a:redhat:acm:2

cpe:/a:redhat:cost_management:4::el9

cpe:/a:redhat:multicluster_engine:2.8::el9

cpe:/a:redhat:acm:2.13::el9

cpe:/o:redhat:rhel_els:7

cpe:/a:redhat:jboss_core_services:1

cpe:/a:redhat:jboss_enterprise_web_server:6

cpe:/a:redhat:jboss_enterprise_web_server:7

cpe:/a:redhat:openshift:4.12::el8

cpe:/o:redhat:rhel_els:6

cpe:/a:redhat:hummingbird:1

Vulnerability dashboard

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