CVE-2026-45447
Heap Use-After-Free in the PKCS7_verify() Function
At a glance
- Severity
- HIGH 8.8
- EPSS
- EPSS 4.00 % · percentile 90 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- openssl
- NVD status
- Modified
Description
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.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2026-35491
- GCVE · GCVE-0-2026-45447
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1352 — Multiples vulnérabilités dans Oracle PeopleSoft · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1351 — Multiples vulnérabilités dans Oracle MySQL · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1345 — Multiples vulnérabilités dans les produits StormShield · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1249 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1056 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0986 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0933 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0914 — Multiples vulnérabilités dans Oracle Database Server · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0796 — Multiples vulnérabilités dans Tenable Identity Exposure · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0783 — Multiples vulnérabilités dans Microsoft Azure · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0782 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0717 — Multiples vulnérabilités dans OpenSSL · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*≥ 1.0.2 < 1.0.2zqcpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*≥ 1.1.1 < 1.1.1zhcpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*≥ 3.0.0 < 3.0.21cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*≥ 3.4.0 < 3.4.6cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*≥ 3.5.0 < 3.5.7cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*≥ 3.6.0 < 3.6.3cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| OpenSSL · OpenSSL | affected 4.0.0 < 4.0.1 ; affected 3.6.0 < 3.6.3 ; affected 3.5.0 < 3.5.7 ; affected 3.4.0 < 3.4.6 ; affected 3.0.0 < 3.0.21 ; affected 1.1.1 < 1.1.1zh |
References
- https://openssl-library.org/news/secadv/20260609.txt
- https://github.com/openssl/openssl/commit/3aad5eb7af4de4ee0633c30a8541a54d9bbde63c
- https://github.com/openssl/openssl/commit/c505d7559da5d5f9f2c3913c6883a5562ce7273e
- https://github.com/openssl/openssl/commit/7d4a980c62258c5910cc883936e0c8dbab4d75a8
- https://github.com/openssl/openssl/commit/a541ae8bfe849a30cc885e8780715c0f488e496c
- https://github.com/openssl/openssl/commit/9dfd688ad2290fc5075cacbc9bf0c9a93eefed54
- https://access.redhat.com/security/cve/CVE-2026-45447
- https://bugzilla.redhat.com/show_bug.cgi?id=2481898
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45447.json
- https://access.redhat.com/errata/RHSA-2026:66524
- https://access.redhat.com/errata/RHSA-2026:58563
- https://access.redhat.com/errata/RHSA-2026:59831
- https://access.redhat.com/errata/RHSA-2026:25237
- https://access.redhat.com/errata/RHSA-2026:36215
- https://access.redhat.com/errata/RHSA-2026:36217
- https://access.redhat.com/errata/RHSA-2026:39012
- https://access.redhat.com/errata/RHSA-2026:39009
- https://access.redhat.com/errata/RHSA-2026:35869
- https://access.redhat.com/errata/RHSA-2026:44438
- https://access.redhat.com/errata/RHSA-2026:25239
- https://access.redhat.com/errata/RHSA-2026:26275
- https://access.redhat.com/errata/RHSA-2026:39981
- https://access.redhat.com/errata/RHSA-2026:47737
- https://access.redhat.com/errata/RHSA-2026:29197
- https://access.redhat.com/errata/RHSA-2026:34102
- https://access.redhat.com/errata/RHSA-2026:58981
- https://access.redhat.com/errata/RHSA-2026:26319
- https://access.redhat.com/errata/RHSA-2026:47735
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |