Issue summary: PBMAC1 parameters in PKCS#12 files are missing validation which can trigger a stack-based buffer overflow, invalid pointer or NULL pointer dereference during MAC verification.
Impact summary: The stack buffer overflow or NULL pointer dereference may cause a crash leading to Denial of Service for an application that parses untrusted PKCS#12 files. The buffer overflow may also potentially enable code execution depending on platform mitigations.
When verifying a PKCS#12 file that uses PBMAC1 for the MAC, the PBKDF2 salt and keylength parameters from the file are used without validation. If the value of keylength exceeds the size of the fixed stack buffer used for the derived key (64 bytes), the key derivation will overflow the buffer. The overflow length is attacker-controlled. Also, if the salt parameter is not an OCTET STRING type this can lead to invalid or NULL pointer dereference.
Exploiting this issue 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 this reason the issue was assessed as Moderate severity.
The FIPS modules in 3.6, 3.5 and 3.4 are not affected by this issue, as PKCS#12 processing is outside the OpenSSL FIPS module boundary.
OpenSSL 3.6, 3.5 and 3.4 are vulnerable to this issue.
OpenSSL 3.3, 3.0, 1.1.1 and 1.0.2 are not affected by this issue as they do not support PBMAC1 in PKCS#12.
CVSS Details
- CVSS 3.1 Base Score: 6.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade openssl-perlUpgrade opensslUpgrade openssl-develUpgrade openssl-libs | Feb 3, 2026 | Jan 28, 2026 |
| Alpine Linux | — | Upgrade openssl | Jan 28, 2026 | Jan 27, 2026 |
| Debian | — | Upgrade openssl | Jul 23, 2026 | Jul 23, 2026 |
| Dell Idrac | — | Upgrade Dell iDRAC to the latest version | Apr 29, 2026 | Apr 28, 2026 |
| Freebsd | — | Upgrade openssl36Upgrade openssl33Upgrade opensslUpgrade openssl34Upgrade FreeBSDUpgrade openssl35 | Jan 28, 2026 | Jan 27, 2026 |
| Http Openssl | — | Upgrade to the latest version of OpenSSL | Mar 5, 2026 | Jan 27, 2026 |
| Oracle_linux | — | Upgrade opensslUpgrade openssl-perlUpgrade openssl-develUpgrade openssl-libs | Jan 30, 2026 | Jan 27, 2026 |
| Redhat_linux | — | Upgrade openssl-perlUpgrade openssl-develUpgrade openssl-libsNo solution existsUpgrade opensslUpgrade openssl-debuginfoUpgrade openssl-libs-debuginfoUpgrade openssl-debugsource | Jan 29, 2026 | Jan 27, 2026 |
| Rocky_linux | — | Upgrade openssl-libs-debuginfoUpgrade openssl-libsUpgrade openssl-debuginfoUpgrade opensslUpgrade openssl-perlUpgrade openssl-develUpgrade openssl-debugsource | Feb 2, 2026 | Jan 30, 2026 |
| Ubuntu | — | Upgrade libssl3t64Upgrade opensslUpgrade libssl3 | Jan 28, 2026 | Jan 27, 2026 |
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