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Fencer Vulns
high 7.5

CVE-2026-63072 json

Heap Buffer Overflow in CMS Key Unwrapping

published 2026-08-25 2 mo ago modified 2026-09-11 58 d ago 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

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 OpenShift Container Platform 5 openshift/ose-rhel-coreos-9 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 19 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 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 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 Red Hat Developer Hub 1.10 rhdh/rhdh-rhel9-operator 1791219676, rhdh/rhdh-operator-bundle 1791315788, rhdh/rhdh-must-gather-rhel9 1788278523, rhdh/rhdh-rag-content-rhel9 1791168570
    not affected: vulnerable code not present

17 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
2 mo ago

Exploit prediction

0.92% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.