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OpenSSL CVE-2026-34181

| EUVDEUVD-2026-35477 HIGH
Improper Validation of Integrity Check Value (CWE-354)
High
Disputed · 7.4 Vendor
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Severity by source

Sources disagree (Low–High)
Vendor (CNA) PRIMARY
7.4 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SUSE
3.1 MEDIUM
AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Red Hat
6.3 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

5
Source Code Evidence Fetched
Jun 10, 2026 - 17:22 vuln.today
Analysis Generated
Jun 10, 2026 - 17:22 vuln.today
CVSS changed
Jun 10, 2026 - 17:22 NVD
7.4 (HIGH)
CVE Published
Jun 09, 2026 - 11:43 nvd
UNKNOWN (no severity yet)
CVE Published
Jun 09, 2026 - 11:43 nvd
HIGH 7.4

Description PRE-NVD

Disclosed via GitHub release of openssl/openssl. NVD scoring and full description are pending.

AnalysisAI

Integrity-check bypass in OpenSSL 3.4.x, 3.5.x, 3.6.x, and 4.0.0 allows PKCS#12 files protected with PBMAC1 to be accepted even when secured by dangerously short HMAC keys, undermining the authentication of the keystore contents. Vendor patches are available in 3.4.6, 3.5.7, 3.6.3, and 4.0.1, and no public exploit identified at time of analysis; EPSS is 0.00% and the issue is not on the CISA KEV list.

Technical ContextAI

OpenSSL is the de-facto TLS and general-purpose cryptography library used across Linux distributions, web servers, and embedded systems. PKCS#12 (.p12/.pfx) files commonly bundle a private key and certificate chain, and PBMAC1 (RFC 9579) is a newer MAC scheme that derives an HMAC key from a password using a PBKDF such as PBKDF2 and protects the integrity of the bag. The flaw is a CWE-354 (Improper Validation of Integrity Check Value): OpenSSL's PBMAC1 verification path does not enforce a minimum derived-key length, so a maliciously crafted PKCS#12 can specify a very short HMAC key for which the MAC tag can be brute-forced or trivially constructed, allowing the file to pass integrity verification even when its contents have been tampered with.

RemediationAI

Apply the vendor-released patches: upgrade to OpenSSL 4.0.1, 3.6.3, 3.5.7, or 3.4.6, whichever matches your branch, using the upstream advisory at https://openssl-library.org/news/secadv/20260609.txt and the OpenSSL 4.0.1 release notes at https://github.com/openssl/openssl/releases/tag/openssl-4.0.1; on Ubuntu, install the packages described in https://ubuntu.com/security/notices/USN-8414-1, and rebuild or restart long-running services (web servers, message brokers, language runtimes) that have the old libcrypto loaded. As a compensating control until patching completes, refuse PKCS#12 imports from untrusted sources, gate certificate-upload endpoints behind authenticated admin workflows, and where feasible require PKCS#12 files to use the legacy PBKDF2/HMAC-SHA256 MAC profile (not PBMAC1) - note the trade-off that this breaks interoperability with newer clients that emit PBMAC1-protected bundles. Avoid pinning HMAC key length in application code as a substitute for the library fix, since this is an OpenSSL parser-side validation gap.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected

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CVE-2026-34181 vulnerability details – vuln.today

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