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CVE-2026-22795— Missing ASN1_TYPE validation in PKCS#12 parsing

Quick assessment

Affected
OpenSSL OpenSSL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL 3.6版本、3.5版本、3.4版本、3.3版本、3.0版本和1.1.1版本存在安全漏洞，该漏洞源于PKCS#12解析代码存在类型混淆，未验证类型即访问ASN1_TYPE联合体成员，可能导致处理畸形PKCS#12文件时取消引用无效或空指针，引发拒绝服务。

AI Predicted 5.3 Difficulty: Easy EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 6

VendorProduct Version RangeStatus
OpenSSL OpenSSL 3.6.0< 3.6.1 affected
3.5.0< 3.5.5 affected
3.4.0< 3.4.4 affected
3.3.0< 3.3.6 affected
3.0.0< 3.0.19 affected
1.1.1< 1.1.1ze affected
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I. Basic Information for CVE-2026-22795

Vulnerability Information
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Vulnerability Title
Missing ASN1_TYPE validation in PKCS#12 parsing
Source: CVE Program / CVE List V5
Vulnerability Description
Issue summary: An invalid or NULL pointer dereference can happen in an application processing a malformed PKCS#12 file. Impact summary: An application processing a malformed PKCS#12 file can be caused to dereference an invalid or NULL pointer on memory read, resulting in a Denial of Service. A type confusion vulnerability exists in PKCS#12 parsing code where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid pointer read. The location is constrained to a 1-byte address space, meaning any attempted pointer manipulation can only target addresses between 0x00 and 0xFF. This range corresponds to the zero page, which is unmapped on most modern operating systems and will reliably result in a crash, leading only to a Denial of Service. Exploiting this issue also requires a user or application to process a maliciously crafted PKCS#12 file. It is uncommon to accept untrusted PKCS#12 files in applications as they are usually used to store private keys which are trusted by definition. For these reasons, the issue was assessed as Low severity. The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the PKCS12 implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue. OpenSSL 1.0.2 is not affected by this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL 3.6版本、3.5版本、3.4版本、3.3版本、3.0版本和1.1.1版本存在安全漏洞，该漏洞源于PKCS#12解析代码存在类型混淆，未验证类型即访问ASN1_TYPE联合体成员，可能导致处理畸形PKCS#12文件时取消引用无效或空指针，引发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSSL OpenSSL 3.6.0 ~ 3.6.1 -

II. Public POCs for CVE-2026-22795

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III. Intelligence Information for CVE-2026-22795

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Vendor Advisories for CVE-2026-22795 (1)

Same Patch Batch · OpenSSL · 2026-01-27 · 12 CVEs total

CVE-2026-22796 ASN1_TYPE Type Confusion in the PKCS7_digest_from_attributes() function
CVE-2025-15467 Stack buffer overflow in CMS (Auth)EnvelopedData parsing
CVE-2025-15469 'openssl dgst' one-shot codepath silently truncates inputs >16MB
CVE-2025-15468 NULL dereference in SSL_CIPHER_find() function on unknown cipher ID
CVE-2025-66199 TLS 1.3 CompressedCertificate excessive memory allocation
CVE-2025-68160 Heap out-of-bounds write in BIO_f_linebuffer on short writes
CVE-2025-11187 Improper validation of PBMAC1 parameters in PKCS#12 MAC verification
CVE-2025-69421 NULL Pointer Dereference in PKCS12_item_decrypt_d2i_ex function
CVE-2025-69420 Missing ASN1_TYPE validation in TS_RESP_verify_response() function
CVE-2025-69419 Out of bounds write in PKCS12_get_friendlyname() UTF-8 conversion
CVE-2025-69418 Unauthenticated/unencrypted trailing bytes with low-level OCB function calls

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL
Same weakness: CWE-754

V. Comments for CVE-2026-22795

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