CVE-2026-28389Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo
Updated under an hour ago ()
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It affects OpenSSL and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Issue summary: During processing of a crafted CMS EnvelopedData message with KeyAgreeRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service. When a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is processed, the optional parameters field of KeyEncryptionAlgorithmIdentifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing. Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- openssl
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
OpenSSL OpenSSL openssl:openssl (from the name) | from 3.6.0 before 3.6.2; from 3.5.0 before 3.5.6; from 3.4.0 before 3.4.5; from 3.3.0 before 3.3.7; from 3.0.0 before 3.0.20; from 1.1.1 before 1.1.1zg; from 1.0.2 before 1.0.2zp | CNA record |
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name) | before V5.0 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
openssl openssl openssl:openssl | from 1.0.2 before 1.0.2zp; from 1.1.1 before 1.1.1zg; from 3.0.0 before 3.0.20; from 3.3.0 before 3.3.7; from 3.4.0 before 3.4.5; from 3.5.0 before 3.5.6; from 3.6.0 before 3.6.2 | NVD |
References
- https://openssl-library.org/news/secadv/20260407.txtvendor-advisory
- https://github.com/openssl/openssl/commit/f80f83bc5fd036bc47d773e8b15a001e2b4ce686patch
- https://github.com/openssl/openssl/commit/16cea4188e0ea567deb4f93f85902247e67384f5patch
- https://github.com/openssl/openssl/commit/785cbf7ea3b5a6f5adf0c1ccb92b79d89c35c616patch
- https://github.com/openssl/openssl/commit/c6725634e089eb2b634b10ede33944be7248172apatch
- https://github.com/openssl/openssl/commit/7b5274e812400cacb6f3be4c2df5340923fa807fpatch
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.