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CVE Vulnerability Details :
CVE-2026-45447
PUBLISHED
More InfoOfficial Page
Assigner-openssl
Assigner Org ID-3a12439a-ef3a-4c79-92e6-6081a721f1e5
View Known Exploited Vulnerability (KEV) details
Published At-09 Jun, 2026 | 16:03
Updated At-10 Jun, 2026 | 13:32
Rejected At-
▼CVE Numbering Authority (CNA)
Heap Use-After-Free in the PKCS7_verify() Function

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.

Affected Products
Vendor
OpenSSLOpenSSL
Product
OpenSSL
Default Status
unaffected
Versions
Affected
  • From 4.0.0 before 4.0.1 (semver)
  • From 3.6.0 before 3.6.3 (semver)
  • From 3.5.0 before 3.5.7 (semver)
  • From 3.4.0 before 3.4.6 (semver)
  • From 3.0.0 before 3.0.21 (semver)
  • From 1.1.1 before 1.1.1zh (custom)
  • From 1.0.2 before 1.0.2zq (custom)
Problem Types
TypeCWE IDDescription
CWECWE-416CWE-416 Use After Free
Type: CWE
CWE ID: CWE-416
Description: CWE-416 Use After Free
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
https://openssl-library.org/policies/general/security-policy/
text:
High
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

reporter
Thai Duong (Calif.io in collaboration with Claude and Anthropic Research)
remediation developer
Igor Ustinov
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://openssl-library.org/news/secadv/20260609.txt
vendor-advisory
https://github.com/openssl/openssl/commit/3aad5eb7af4de4ee0633c30a8541a54d9bbde63c
patch
https://github.com/openssl/openssl/commit/c505d7559da5d5f9f2c3913c6883a5562ce7273e
patch
https://github.com/openssl/openssl/commit/7d4a980c62258c5910cc883936e0c8dbab4d75a8
patch
https://github.com/openssl/openssl/commit/a541ae8bfe849a30cc885e8780715c0f488e496c
patch
https://github.com/openssl/openssl/commit/9dfd688ad2290fc5075cacbc9bf0c9a93eefed54
patch
Hyperlink: https://openssl-library.org/news/secadv/20260609.txt
Resource:
vendor-advisory
Hyperlink: https://github.com/openssl/openssl/commit/3aad5eb7af4de4ee0633c30a8541a54d9bbde63c
Resource:
patch
Hyperlink: https://github.com/openssl/openssl/commit/c505d7559da5d5f9f2c3913c6883a5562ce7273e
Resource:
patch
Hyperlink: https://github.com/openssl/openssl/commit/7d4a980c62258c5910cc883936e0c8dbab4d75a8
Resource:
patch
Hyperlink: https://github.com/openssl/openssl/commit/a541ae8bfe849a30cc885e8780715c0f488e496c
Resource:
patch
Hyperlink: https://github.com/openssl/openssl/commit/9dfd688ad2290fc5075cacbc9bf0c9a93eefed54
Resource:
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.18.8HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version: 3.1
Base score: 8.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Details not found