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Fencer Intel
high 7.5

CVE-2026-63072 json

Heap Buffer Overflow in CMS Key Unwrapping

published 2mo ago modified last mo. also EUVD-2026-65482

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based on querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive can write and cleanse more bytes than that query reports, causing an 8-byte out-of-bounds heap write.

Impact summary: An attacker who supplies a crafted CMS message can trigger a deterministic 8-byte out-of-bounds heap write when the victim decrypts it with CMS_decrypt(), corrupting the heap and typically resulting in a Denial of Service.

CWE: CWE-787: Out-of-bounds Write

Description: The key-wrap OID is potentially attacker-controlled on the wire. CMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers. An attacker can take a legitimate message and change a single OID byte to select the padded variant while leaving the message otherwise valid. Since the unwrap key is derived from the recipient's private operation (ECDH key agreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot pass, and the decryption fails with integrity failure.

The write is a fixed-size (8-byte), fixed-value (zero) heap overflow immediately past the allocation, requires no special configuration, and is reachable from the public CMS_decrypt() function. The consequence is a heap corruption leading to a Denial of Service. The fix in the CMS code sizes the unwrap output buffer for the worst case so a failed unwrap cannot write past the allocation.

FIPS impact: no

As the CMS code lives outside the FIPS module boundary, no FIPS modules are affected by this CVE.

Patch / fix

  • OpenSSL OpenSSL 1.1.1zi, 3.0.22, 3.4.7, 3.5.8, 3.6.4, 4.0.2
  • openssl Debian 12 3.0.22-1~deb12u1
  • openssl Debian 13 3.5.7-1~deb13u2
  • openssl Debian 14 3.6.4-1

debian advisories DEBIAN-CVE-2026-63072

  • edk2 Ubuntu 22.04 LTS 2022.02-3ubuntu0.22.04.7
  • edk2 Ubuntu 24.04 LTS 2024.02-2ubuntu0.10
  • edk2 Ubuntu 26.04 LTS 2025.11-3ubuntu7.3
  • openssl Ubuntu 22.04 LTS 3.0.2-0ubuntu1.29
  • openssl Ubuntu 24.04 LTS 3.0.13-0ubuntu3.15
  • openssl Ubuntu 26.04 LTS 3.5.5-1ubuntu3.4
  • edk2 Ubuntu Pro 18.04 LTS 0~20180205.c0d9813c-2ubuntu0.3+esm3
  • edk2 Ubuntu Pro 20.04 LTS 0~20191122.bd85bf54-2ubuntu3.6+esm1

ubuntu advisories UBUNTU-CVE-2026-63072

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvox-agent RHEL 6 SATELLITE_OPENVOX 8.30.0-1.el10sat
  • openvox-agent RHEL 6 SATELLITE_OPENVOX 8.30.0-1.el7sat
  • openvox-agent RHEL 6 SATELLITE_OPENVOX 8.30.0-1.el8sat
  • openvox-agent RHEL 6 SATELLITE_OPENVOX 8.30.0-1.el9sat
  • compat-openssl11 RHEL 9 1:1.1.1k-5.el9_8.6
  • openssl RHEL 9 1:3.5.8-1.el9_8
  • openssl-libs RHEL 9 1:3.5.8-1.el9_8
  • openssl-perl RHEL 9 1:3.5.8-1.el9_8

red hat advisories RHSA-2026:85249RHSA-2026:80514RHSA-2026:67165RHSA-2026:67154RHSA-2026:59635RHSA-2026:59641

  • openssl-3-livepatches SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 0.6-160000.1.1
  • openssl-1_1 SLE Module for Legacy 15 SP7, SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 1.1.1w-150700.11.30.1
  • openssl-3 SLE Module for Basesystem 15 SP7 3.5.0-150700.5.50.1
  • openssl-1_1 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 1.1.1l-150400.7.104.1
  • openssl-3 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 3.0.8-150400.4.98.1
  • openssl-3 Linux Micro 6.0 3.1.4-17.1
  • openssl-3 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.5.0-160000.10.1
  • openssl-3-livepatches Linux Micro 6.1 0.6-slfo.1.1_1.1

suse advisories SUSE-SU-2026:23788-1SUSE-SU-2026:23794-1SUSE-SU-2026:4043-1SUSE-SU-2026:4042-1SUSE-SU-2026:4041-1SUSE-SU-2026:4040-1

  • openssl-3 openSUSE Leap 16.0 3.5.0-160000.10.1
  • openssl-3 openSUSE Tumbleweed 3.5.3-8.1

opensuse advisories openSUSE-SU-2026:21744-1openSUSE-SU-2026:11623-1

  • openssl AlmaLinux 8 1:1.1.1k-18.el8_6
  • openssl-libs AlmaLinux 8 1:1.1.1k-18.el8_6
  • openssl-perl AlmaLinux 8 1:1.1.1k-18.el8_6
  • compat-openssl11 AlmaLinux 9 1:1.1.1k-5.el9_8.6
  • openssl AlmaLinux 10 1:3.5.8-1.el10_2.alma.1
  • openssl-libs AlmaLinux 10 1:3.5.8-1.el10_2.alma.1
  • openssl-perl AlmaLinux 10 1:3.5.8-1.el10_2.alma.1
  • openssl AlmaLinux 9 1:3.5.8-1.el9_8

almalinux advisories ALSA-2026:85968ALSA-2026:80514ALSA-2026:67154ALSA-2026:67165

  • compat-openssl11 Rocky Linux 9 1:1.1.1k-5.el9_8.6
  • openssl Rocky Linux 9 1:3.5.8-1.el9_8
  • openssl Rocky Linux 10 1:3.5.8-1.el10_2

rocky linux advisories RLSA-2026:80514RLSA-2026:67165RLSA-2026:67154

  • openssl Alpine 3.21 3.3.7-r1
  • openssl Alpine 3.24, Alpine 3.23, Alpine 3.22 3.5.8-r0

alpine advisories ALPINE-CVE-2026-63072

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • edk2 Azure Linux 3.0 20240524git3e722403cd16-20
  • openssl Azure Linux 3.0 3.3.7-6

azure linux advisories AZL-97890AZL-97947

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-63072 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-63072 updated cvss 7.5

openssl: heap buffer overflow in CMS key unwrapping

  • Red Hat Enterprise Linux 7 ovmf, OVMF, AAVMF Red Hat Enterprise Linux 10 edk2
    affected: workaround, no fix available
  • Red Hat JBoss Core Services jbcs-httpd24-openssl, jbcs-httpd24-openssl-libs, jbcs-httpd24-openssl-perl, jbcs-openssl-win6-x86_64.zip 3.5.5-SP4 Red Hat JBoss Web Server 6 jws-optional-native-components-win6-x86_64.zip 6.2.4.ER1 Red Hat JBoss Web Server 7 jws-optional-native-components-win6-x86_64.zip 6.2.4.ER1
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8 Red Hat Satellite 6 puppet-agent Red Hat Satellite Client puppet-agent, openvox-agent
    affected: workaround, no fix available
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-operator-rhel9 1790272426, cert-manager/cert-manager-operator-rhel9 1790589855, cert-manager/jetstack-cert-manager-rhel9 1790223279, cert-manager/jetstack-cert-manager-rhel9 1790589912, cert-manager/cert-manager-istio-csr-rhel9 1790223719, cert-manager/cert-manager-istio-csr-rhel9 1790589914, +1 more
    fixed: vendor fix RHSA-2026:72475
  • Red Hat Cost Management 4 costmanagement/costmanagement-metrics-rhel9-operator 1790844333
    fixed: vendor fix RHSA-2026:81201
  • Red Hat Cost Management On-Premise 1 costmanagement/costmanagement-ui-rhel10 1791460851
    fixed: vendor fix RHSA-2026:79357
  • Red Hat Developer Hub 1.10 rhdh/rhdh-hub-rhel9 1791311495
    fixed: vendor fix RHSA-2026:79088
  • Red Hat Enterprise Linux AppStream (v. 9) openssl-perl 3.5.8-1.el9_8, compat-openssl11 1.1.1k-5.el9_8.6
    fixed: vendor fix RHSA-2026:80514
show 21 more
  • Red Hat Enterprise Linux AppStream (v. 10) openssl-perl 3.5.8-1.el10_2
    fixed: vendor fix RHSA-2026:67154
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) compat-openssl11 1.1.1k-4.el9_2.3
    fixed: vendor fix RHSA-2026:89737
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) compat-openssl11 1.1.1k-5.el9_4.4
    fixed: vendor fix RHSA-2026:89736
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) compat-openssl11 1.1.1k-5.el9_6.4
    fixed: vendor fix RHSA-2026:89738
  • Red Hat Enterprise Linux BaseOS (v. 8) openssl 1.1.1k-18.el8_6, openssl-libs 1.1.1k-18.el8_6, openssl-perl 1.1.1k-18.el8_6
    fixed: vendor fix RHSA-2026:85968
  • Red Hat Enterprise Linux BaseOS (v. 9) openssl 3.5.8-1.el9_8, openssl-libs 3.5.8-1.el9_8
    fixed: vendor fix RHSA-2026:67165
  • Red Hat Enterprise Linux BaseOS (v. 10) openssl 3.5.8-1.el10_2, openssl-libs 3.5.8-1.el10_2
    fixed: vendor fix RHSA-2026:67154
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) openssl 1.1.1g-18.el8_4.4, openssl-libs 1.1.1g-18.el8_4.4, openssl-perl 1.1.1g-18.el8_4.4
    fixed: vendor fix RHSA-2026:85970
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) openssl 1.1.1k-18.el8_6, openssl-libs 1.1.1k-18.el8_6, openssl-perl 1.1.1k-18.el8_6
    fixed: vendor fix RHSA-2026:85968
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) openssl 3.0.7-29.el9_4.4, openssl-libs 3.0.7-29.el9_4.4
    fixed: vendor fix RHSA-2026:96216
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) openssl 1.1.1g-18.el8_4.4, openssl-libs 1.1.1g-18.el8_4.4, openssl-perl 1.1.1g-18.el8_4.4
    fixed: vendor fix RHSA-2026:85970
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) openssl 1.1.1k-18.el8_6, openssl-libs 1.1.1k-18.el8_6, openssl-perl 1.1.1k-18.el8_6 Red Hat Enterprise Linux BaseOS TUS (v.8.8) openssl 1.1.1k-18.el8_6, openssl-libs 1.1.1k-18.el8_6, openssl-perl 1.1.1k-18.el8_6
    fixed: vendor fix RHSA-2026:85968
  • Red Hat Hardened Images openssl 3.5.8-0.1.hum1, openssl3 3.5.8-0.1.hum1, openssl-libs 3.5.8-0.1.hum1, openssl-perl 3.5.8-0.1.hum1, openssl3-libs 3.5.8-0.1.hum1, openssl-config-fips 3.5.8-0.1.hum1, +3 more
    fixed: vendor fix RHSA-2026:59641
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202611032353
    fixed: vendor fix RHSA-2026:95346
  • Red Hat OpenShift Container Platform 5.0 rhcos 5.0.9.8.202611022248, rhcos 5.0.10.2.202611022203
    fixed: vendor fix RHSA-2026:94537
  • Red Hat Satellite 6.16 for RHEL 8 openvox-agent 8.31.1-1.el8sat Red Hat Satellite 6.16 for RHEL 9 openvox-agent 8.31.1-1.el9sat
    fixed: vendor fix RHSA-2026:92858
  • Red Hat Satellite 6.17 for RHEL 9 openvox-agent 8.31.1-1.el9sat
    fixed: vendor fix RHSA-2026:92859
  • Red Hat Satellite 6.18 for RHEL 9 openvox-agent 8.31.1-1.el9sat
    fixed: vendor fix RHSA-2026:92860
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1790241954, rhui5/rhua-rhel9 1790242004, rhui5/haproxy-rhel9 1790241900, rhui5/installer-rhel9 1789482961, rhui5/cds-kubernetes-rhel9 1789479916
    fixed: vendor fix RHSA-2026:67956
  • Red Hat Satellite Client 6 for RHEL 7 openvox-agent 8.30.0-1.el7sat Red Hat Satellite Client 6 for RHEL 8 openvox-agent 8.30.0-1.el8sat Red Hat Satellite Client 6 for RHEL 9 openvox-agent 8.30.0-1.el9sat Red Hat Satellite Client 6 for RHEL 10 openvox-agent 8.30.0-1.el10sat
    fixed: vendor fix RHSA-2026:85249
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/jetstack-cert-manager-acmesolver-rhel9 1790223630 Red Hat Cost Management 4 costmanagement/costmanagement-metrics-operator-bundle 1790851152
    not affected: vulnerable code not present

18 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.92% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • OpenSSL OpenSSL

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.