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 Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade compat-openssl10Upgrade opensslUpgrade openssl-develUpgrade openssl-libsUpgrade compat-openssl11Upgrade openssl-perl | Jun 16, 2026 | Jun 11, 2026 |
| Alpine Linux | — | Upgrade openssl | Jun 18, 2026 | Jun 9, 2026 |
| Amazon Linux Ami 2 | — | Upgrade openssl11-libsUpgrade edk2-ovmfUpgrade openssl-perlUpgrade openssl-snapsafeUpgrade openssl-snapsafe-develUpgrade edk2-aarch64Upgrade openssl-libsUpgrade openssl-snapsafe-debuginfoUpgrade edk2-tools-docUpgrade openssl11-develUpgrade opensslUpgrade openssl11-debuginfoUpgrade openssl-snapsafe-staticUpgrade openssl-snapsafe-libsUpgrade openssl11-staticUpgrade edk2-debuginfoUpgrade openssl-debuginfoUpgrade openssl11Upgrade edk2-toolsUpgrade openssl-develUpgrade openssl-staticUpgrade openssl-snapsafe-perl | Jun 23, 2026 | Jun 23, 2026 |
| Amazon_linux_2023 | — | Upgrade openssl-snapsafe-libsUpgrade openssl-libsUpgrade openssl-snapsafe-libs-debuginfoUpgrade opensslUpgrade openssl-perlUpgrade openssl-fips-provider-latest-debuginfoUpgrade openssl-develUpgrade openssl-debugsourceUpgrade openssl-fips-provider-latestUpgrade openssl-libs-debuginfoUpgrade openssl-debuginfo | Jun 23, 2026 | Jun 9, 2026 |
| Debian | — | Upgrade openssl | Jun 16, 2026 | Jun 16, 2026 |
| Freebsd | — | Upgrade openssl36Upgrade opensslUpgrade openssl35Upgrade openssl34Upgrade openssl40Upgrade FreeBSDUpgrade openssl111 | Jun 15, 2026 | Jun 10, 2026 |
| Http Openssl | — | Upgrade to the latest version of OpenSSL | Jun 10, 2026 | Jun 9, 2026 |
| Ibm Aix | — | Apply the fix or workaround for openssl_advisory48 | Jul 22, 2026 | Jul 21, 2026 |
| Oracle Missing Cpu Jul 2026 | — | Apply the July 2026 Critical Patch Update (CPU) for Oracle Database | Jul 22, 2026 | Jun 9, 2026 |
| Redhat Openshift | — | Upgrade rhcos | Sep 7, 2026 | Jun 9, 2026 |
| Redhat_linux | — | Upgrade openssl-develUpgrade compat-openssl11-debugsourceUpgrade openssl-debuginfoUpgrade openssl-debugsourceUpgrade compat-openssl10Upgrade openssl-libs-debuginfoUpgrade compat-openssl11Upgrade opensslUpgrade compat-openssl10-debuginfoUpgrade openssl-libsUpgrade compat-openssl10-debugsourceUpgrade openssl-perlUpgrade compat-openssl11-debuginfoUpgrade openssl-static | Jun 17, 2026 | Jun 9, 2026 |
| Rocky_linux | — | Upgrade compat-openssl10Upgrade compat-openssl11-debugsourceUpgrade openssl-perlUpgrade openssl-libsUpgrade compat-openssl10-debugsourceUpgrade compat-openssl11Upgrade compat-openssl10-debuginfoUpgrade opensslUpgrade openssl-libs-debuginfoUpgrade compat-openssl11-debuginfoUpgrade openssl-debugsourceUpgrade openssl-develUpgrade openssl-debuginfo | Jun 17, 2026 | Jun 13, 2026 |
| Splunk | — | Upgrade Splunk Enterprise to version 10.2.6Upgrade Splunk Enterprise to version 10.0.9Upgrade Splunk Enterprise to version 9.4.14Upgrade Splunk Enterprise to version 10.4.2 | Aug 20, 2026 | Jun 9, 2026 |
| Ubuntu | — | Upgrade openssl1.0 (Ubuntu Pro)Upgrade openssl (Ubuntu Pro)Upgrade opensslUpgrade libssl3t64Upgrade libssl3 | Jun 16, 2026 | Jun 9, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jun 18, 2026 | Jun 9, 2026 |
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