CVE-2026-28390 Possible NULL Dereference When Processing CMS KeyTransportRecipientInfo
Attackers can cause a denial of service by sending crafted CMS data that triggers a NULL pointer dereference in OpenSSL.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-28390?
CVE-2026-28390 is a high-severity vulnerability in Openssl Openssl, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Issue summary: During processing of a crafted CMS EnvelopedData message with KeyTransportRecipientInfo 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 KeyTransportRecipientInfo with RSA-OAEP encryption is processed, the optional parameters field of RSA-OAEP SourceFunc algorithm identifier 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.
Weakness: CWE-476
Which versions are affected by CVE-2026-28390?
It affects 1 product.
Linux distribution packages (40)
openssl AlmaLinux:10 | All versions | 1:3.5.5-3.el10_2.alma.1 |
openssl-devel AlmaLinux:10 | All versions | 1:3.5.5-3.el10_2.alma.1 |
openssl-libs AlmaLinux:10 | All versions | 1:3.5.5-3.el10_2.alma.1 |
openssl-perl AlmaLinux:10 | All versions | 1:3.5.5-3.el10_2.alma.1 |
compat-openssl10 AlmaLinux:8 | All versions | 1:1.0.2o-4.el8_10.2 |
openssl AlmaLinux:8 | All versions | 1:1.1.1k-17.el8_6 |
openssl-devel AlmaLinux:8 | All versions | 1:1.1.1k-17.el8_6 |
openssl-libs AlmaLinux:8 | All versions | 1:1.1.1k-17.el8_6 |
openssl-perl AlmaLinux:8 | All versions | 1:1.1.1k-17.el8_6 |
compat-openssl11 AlmaLinux:9 | All versions | 1:1.1.1k-5.el9_8.3 |
openssl Red Hat:enterprise_linux:10.2 | All versions | 1:3.5.5-3.el10_2 |
openssl-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 1:3.5.5-3.el10_2 |
openssl-debugsource Red Hat:enterprise_linux:10.2 | All versions | 1:3.5.5-3.el10_2 |
openssl-devel Red Hat:enterprise_linux:10.2 | All versions | 1:3.5.5-3.el10_2 |
openssl-libs Red Hat:enterprise_linux:10.2 | All versions | 1:3.5.5-3.el10_2 |
openssl-libs-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 1:3.5.5-3.el10_2 |
openssl-perl Red Hat:enterprise_linux:10.2 | All versions | 1:3.5.5-3.el10_2 |
compat-openssl10 Red Hat:enterprise_linux:8::appstream | All versions | 1:1.0.2o-4.el8_10.2 |
compat-openssl10-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 1:1.0.2o-4.el8_10.2 |
compat-openssl10-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 1:1.0.2o-4.el8_10.2 |
openssl Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1k-17.el8_6 |
openssl-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1k-17.el8_6 |
openssl-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1k-17.el8_6 |
openssl-devel Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1k-17.el8_6 |
openssl-libs Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1k-17.el8_6 |
openssl-perl Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1k-17.el8_6 |
compat-openssl11 Red Hat:enterprise_linux:9::appstream | All versions | 1:1.1.1k-5.el9_8.3 |
compat-openssl11-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 1:1.1.1k-5.el9_8.3 |
compat-openssl11-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 1:1.1.1k-5.el9_8.3 |
openssl Red Hat:hummingbird:1 | All versions | 0:3.5.6-0.3.hum1 |
openssl-config-fips Red Hat:hummingbird:1 | All versions | 0:3.5.6-0.3.hum1 |
openssl-devel Red Hat:hummingbird:1 | All versions | 0:3.5.6-0.3.hum1 |
openssl-devel-engine Red Hat:hummingbird:1 | All versions | 0:3.5.6-0.3.hum1 |
openssl-fips-provider-upstream Red Hat:hummingbird:1 | All versions | 0:3.5.6-0.3.hum1 |
openssl-libs Red Hat:hummingbird:1 | All versions | 0:3.5.6-0.3.hum1 |
openssl-perl Red Hat:hummingbird:1 | All versions | 0:3.5.6-0.3.hum1 |
compat-openssl10 Red Hat:rhel_aus:8.4::appstream | All versions | 1:1.0.2o-3.el8_4.1 |
compat-openssl10-debuginfo Red Hat:rhel_aus:8.4::appstream | All versions | 1:1.0.2o-3.el8_4.1 |
compat-openssl10-debugsource Red Hat:rhel_aus:8.4::appstream | All versions | 1:1.0.2o-3.el8_4.1 |
openssl Red Hat:rhel_aus:8.4::baseos | All versions | 1:1.1.1g-18.el8_4.3 |
Products include Openssl Openssl.
How do I fix CVE-2026-28390?
Apply the vendor's patch.
Is CVE-2026-28390 being exploited?
There is no known exploitation of CVE-2026-28390 in the wild and no public exploit code.
Other vulnerabilities in Openssl Openssl
Sources
Also known as ALPINE-CVE-2026-28390, ALSA-2026:22313, ALSA-2026:22314, ALSA-2026:22315, ALSA-2026:38503, AZL-82070 and 45 more.