Heap Use-After-Free in the PKCS7_verify() Function

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• openssl openssl1.0.2 and later · before 1.0.2zq
• openssl openssl1.1.1 and later · before 1.1.1zh
• openssl openssl3.0.0 and later · before 3.0.21
• openssl openssl3.4.0 and later · before 3.4.6
• openssl openssl3.5.0 and later · before 3.5.7
• openssl openssl3.6.0 and later · before 3.6.3
• openssl openssl4.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (openssl). Independent of NVD's CPE analysis and usually ahead of it.

• OpenSSL OpenSSL

  • 4.0.0 and later · before 4.0.1affected · semver
  • 3.6.0 and later · before 3.6.3affected · semver
  • 3.5.0 and later · before 3.5.7affected · semver
  • 3.4.0 and later · before 3.4.6affected · semver
  • 3.0.0 and later · before 3.0.21affected · semver
  • 1.1.1 and later · before 1.1.1zhaffected
  • 1.0.2 and later · before 1.0.2zqaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows remKEV
  90Now
• CVE-2021-3711SM2 Decryption Buffer Overflow
  65This week
• CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code
  65This week

Published before and after this one in the same product

• ← EarlierCVE-2026-45445Jun 9, 2026 · AES-OCB IV Ignored on EVP_Cipher() Path
  30Monitor
• ← EarlierCVE-2026-45446Jun 9, 2026 · Incorrect Tag Processing for Empty Messages in AES-GCM-SIV and AES-SIV modes
  19Monitor
• Later →CVE-2026-7383Jun 9, 2026 · Possible Heap Buffer Overflow in ASN.1 Multibyte String Conversion
  32Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.