Description
Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches
additional certificates (extraCerts) sent in a CMP message, but never expunges
them (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX
frequently, this cache of extraCerts may grow unboundedly, and a malicious
client may flood a CMP server with requests driving this growth.
Impact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX
for the lifetime of a server process may observe unbounded memory growth in the
event a malicious client repeatedly sends requests containing unique extra
certificates, which may lead to OOM conditions.
CWE: CWE-770: Allocation of Resources Without Limits or Throttling
Description: If a remote user sends CMP messages to a server with a list of
extraCerts and the message is rejected, the extraCerts from the message remains
in the server contexts untrusted certificate stack. This exposes servers with
long lived ctx objects to Denial of Service attacks in which an attacker sends
messages intending to be rejected with a large list of additional certificates
repeatedly, forcing the server to store them indefinitely.
The issue was fixed by removing the added extra certs if the message is
rejected, using the same method as when the context is configured to not do
caching at all.
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 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | openssl | 3.5.5-1ubuntu3.4 | USN-8678-1 |
| Ubuntu 24.04 LTS | edk2 | No fix yet | — |
| Ubuntu 24.04 LTS | openssl | 3.0.13-0ubuntu3.15 | USN-8678-1 |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.29 | USN-8678-1 |
Show 5 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 18.04 LTS | nodejs | No fix yet | — |
| 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 | 1:3.5.8-0.1.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 12 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 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 |
| SLE Micro 6.2 | openssl-3 | 3.5.0-160000.10.1 | SUSE-SU-2026:23463-1 |
| SLE Micro 6.1 | openssl-3 | 3.1.4-slfo.1.1_13.1 | SUSE-SU-2026:23512-1 |
| 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 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 | — |
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 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl-4.0 +2 | 4.0.2-r0 | — |
Advisories 23
- RHSA-2026:67165 Red Hat Security Advisory: openssl security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:59641 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:59635 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- 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-2026:67154 Red Hat Security Advisory: openssl security, 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
- SUSE-SU-2026:23609-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 29, 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
- 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-2026:4032-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:4039-1 Security update for openssl-3 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