Description
Issue summary: OpenSSL CMP password based protection verification only
checks whether the protectionAlg parameter was not NULL and not its
ASN.1 type, before treating it as a PBMParameter. A crafted message can
contain a parameter of a different type, which is then dereferenced as an
invalid pointer.
Impact summary: A remote, unauthenticated attacker can crash an application
acting as a CMP server that accepts PBM-protected messages, or a CMP client
talking to a malicious or intercepted CMP server, resulting in a Denial of
Service.
CWE: CWE-476: NULL Pointer Dereference
Description: When verifying the password-based MAC protection of a CMP
message, OpenSSL library reads the protectionAlg algorithm parameter with
X509_ALGOR_get0(), which returns both the parameter type and its value
pointer. The value is then cast to an ASN1_STRING and treated as the
expected PBMParameter after only checking that pointer is not NULL. The
parameter type returned by X509_ALGOR_get0() was never consulted.
This happens during protection verification, before any MAC is computed, so
no knowledge of the PBM shared secret is required; the only precondition is
that PBM verification is reachable. On the server side this is reached from
OSSL_CMP_SRV_process_request() for any application that stands up a CMP
server accepting PBM-protected messages, and on the client side from CMP
response validation against a malicious or on-path (MITM) server. The
reliable consequence is a denial of service; there is no memory disclosure,
no controlled memory write, and no path to code execution. CMP is a
specialized feature that an application must explicitly enable.
FIPS impact: no
As the CMP code lives outside the FIPS module boundary, no FIPS modules
are affected by this CVE.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenSSL | OpenSSL | 4.0.0 – < 4.0.2, 3.6.0 – < 3.6.4, 3.5.0 – < 3.5.8, 3.4.0 – < 3.4.7, 3.0.0 – < 3.0.22 | 4.0.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openssl | 3.6.4-1 | — |
| Debian 13 | openssl | 3.5.7-1~deb13u2 | — |
| Debian 12 | openssl | 3.0.22-1~deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | edk2 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | edk2 | 2025.11-3ubuntu7.3 | USN-8865-1 |
| Ubuntu 26.04 LTS | edk2-hwe | No fix yet | — |
| Ubuntu 26.04 LTS | openssl | 3.5.5-1ubuntu3.4 | USN-8678-1 |
| Ubuntu 24.04 LTS | edk2 | 2024.02-2ubuntu0.10 | USN-8865-1 |
| Ubuntu 24.04 LTS | openssl | 3.0.13-0ubuntu3.15 | USN-8678-1 |
| Ubuntu 22.04 LTS | edk2 | 2022.02-3ubuntu0.22.04.7 | USN-8865-1 |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.29 | USN-8678-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 24.04 LTS | openssl-fips | 3.0.13-0ubuntu3.15+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl | 3.0.2-0ubuntu1.29+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl-fips | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | openssl +1 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | edk2 | 0~20191122.bd85bf54-2ubuntu3.6+esm1 | USN-8865-1 |
| Ubuntu Pro 18.04 LTS | edk2 | 0~20180205.c0d9813c-2ubuntu0.3+esm3 | USN-8865-1 |
| Ubuntu Pro 18.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 16.04 LTS | edk2 | 0~20160408.ffea0a2c-2ubuntu0.2+esm4 | USN-8865-1 |
| Ubuntu Pro 16.04 LTS | nodejs | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | openssl +3 | 1:3.5.8-1.el10_2 | RHSA-2026:67154 |
| RHEL 9 | openssl +3 | 1:3.5.8-1.el9_8 | RHSA-2026:67165 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | openssl +10 | 3.5.8-0.1.hum1 | RHSA-2026:59641, RHSA-2026:59635 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | openssl +3 | 1:3.5.8-1.el10_2.alma.1 | ALSA-2026:67154 |
| AlmaLinux 9 | openssl +3 | 1:3.5.8-1.el9_8 | ALSA-2026:67165 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | openssl | 1:3.5.8-1.el10_2 | RLSA-2026:67154 |
| Rocky Linux 9 | openssl | 1:3.5.8-1.el9_8 | RLSA-2026:67165 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openssl-3 | 3.5.0-150700.5.50.1 | SUSE-SU-2026:4039-1 |
| SLES 15 SP6 | openssl-3 | 3.1.4-150600.5.64.1 | SUSE-SU-2026:3866-1 |
| SLES 15 SP5 | openssl-3 | 3.0.8-150500.5.75.1 | SUSE-SU-2026:3876-1 |
| SLES 15 SP4 | openssl-3 | 3.0.8-150400.4.98.1 | SUSE-SU-2026:4032-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | openssl-3 | 3.5.0-160000.10.1 | SUSE-SU-2026:23609-1 |
| SLES for SAP 16.0 | openssl-3-livepatches +1 | 0.6-160000.1.1 | SUSE-SU-2026:23788-1, SUSE-SU-2026:23585-1 |
| SLES for SAP 15 SP6 | openssl-3 | 3.1.4-150600.5.64.1 | SUSE-SU-2026:3866-1 |
| SLES for SAP 15 SP5 | openssl-3 | 3.0.8-150500.5.75.1 | SUSE-SU-2026:3876-1 |
| SLES for SAP 15 SP4 | openssl-3 | 3.0.8-150400.4.98.1 | SUSE-SU-2026:4032-1 |
| SLES 16.0 | openssl-3 | 3.5.0-160000.10.1 | SUSE-SU-2026:23609-1 |
| SLES 16.0 | openssl-3-livepatches +1 | 0.6-160000.1.1 | SUSE-SU-2026:23788-1, SUSE-SU-2026:23585-1 |
| SLE Micro 6.2 | openssl-3 | 3.5.0-160000.10.1 | SUSE-SU-2026:23463-1 |
| SLE Micro 6.2 | openssl-3-livepatches | 0.6-160000.1.1 | SUSE-SU-2026:23794-1 |
| SLE Micro 6.1 | openssl-3 | 3.1.4-slfo.1.1_13.1 | SUSE-SU-2026:23512-1 |
| SLE Micro 6.1 | openssl-3-livepatches | 0.6-slfo.1.1_1.1 | SUSE-SU-2026:23538-1 |
| SLE Micro 6.0 | openssl-3 | 3.1.4-17.1 | SUSE-SU-2026:23473-1 |
| SLE Micro 5.4 | openssl-3 | 3.0.8-150400.4.98.1 | SUSE-SU-2026:4032-1 |
| SLE Micro 5.3 | openssl-3 | 3.0.8-150400.4.98.1 | SUSE-SU-2026:4032-1 |
| SLE Live Patching 15 SP7 | openssl-3-livepatches | 0.6-150700.16.12.1 | SUSE-SU-2026:4040-1 |
| SLE Live Patching 15 SP6 | openssl-3-livepatches | 0.6-150600.13.19.1 | SUSE-SU-2026:4038-1 |
| SLE HPC 15 SP5 | openssl-3 | 3.0.8-150500.5.75.1 | SUSE-SU-2026:3876-1 |
| SLE HPC 15 SP4 | openssl-3 | 3.0.8-150400.4.98.1 | SUSE-SU-2026:4032-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-3 | 3.5.3-8.1 | openSUSE-SU-2026:11623-1 |
| openSUSE Leap 16.0 | openssl-3 | 3.5.0-160000.10.1 | openSUSE-SU-2026:21744-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssl | 3.5.8-r0 | — |
| Alpine v3.23 | openssl | 3.5.8-r0 | — |
| Alpine v3.22 | openssl | 3.5.8-r0 | — |
| Alpine v3.21 | openssl | 3.3.7-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssl +5 | 1:3.5.8-1.amzn2023.0.1 | ALAS2023-2026-2136 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | edk2 | 20240524git3e722403cd16-20 | — |
| Azure Linux 3 | openssl | 3.3.7-6 | — |
| Azure Linux 3 | openssl-fips-provider | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl-4.0 +2 | 4.0.2-r0 | — |
Advisories 30
- WID-SEC-2026-3005 OpenSSL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2026:67165 Important: openssl security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:67154 Important: openssl security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:67165 Red Hat Security Advisory: openssl security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:67154 Red Hat Security Advisory: openssl security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:59635 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:59641 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2026-3642 Meinberg LANTIME: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 14, 2026
- USN-8865-1 edk2 vulnerabilities Ubuntu Security Notices (USN) · Oct 5, 2026
- SUSE-SU-2026:23609-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23585-1 Security update for openssl-3-x86_64-v3-livepatches SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23788-1 Security update for openssl-3-livepatches SUSE / openSUSE Security Updates · Sep 27, 2026
- SUSE-SU-2026:23794-1 Security update for openssl-3-livepatches SUSE / openSUSE Security Updates · Sep 27, 2026
- SUSE-SU-2026:23512-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 16, 2026
- RLSA-2026:67165 Important: openssl security, bug fix, and enhancement update Rocky Linux Security Advisories · Sep 15, 2026
- SUSE-SU-2026:23538-1 Security update for openssl-3-livepatches SUSE / openSUSE Security Updates · Sep 15, 2026
- RLSA-2026:67154 Important: openssl security, bug fix, and enhancement update Rocky Linux Security Advisories · Sep 15, 2026
- SUSE-SU-2026:23463-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 14, 2026
- SUSE-SU-2026:23473-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 14, 2026
- ALAS2023-2026-2136 Important: openssl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 14, 2026
- SUSE-SU-2026:4039-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:4040-1 Security update for openssl-3-livepatches SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:4032-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:4038-1 Security update for openssl-3-livepatches SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:3876-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 10, 2026
- SUSE-SU-2026:3866-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 10, 2026
- openSUSE-SU-2026:21744-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 9, 2026
- USN-8678-1 openssl vulnerabilities Ubuntu Security Notices (USN) · Sep 3, 2026
- openSUSE-SU-2026:11623-1 libopenssl-3-devel-3.5.3-8.1 on GA media SUSE / openSUSE Security Updates · Aug 28, 2026
- WID-SEC-2026-3034 FreeBSD Project FreeBSD OS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 25, 2026
References
- OpenSSL Advisory vendor-advisory
- 4.0.2 git commit patch
- 3.6.4 git commit patch
- 3.5.8 git commit patch
- 3.4.7 git commit patch
- 3.0.22 git commit patch