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Invalid Pointer Dereference in CMP Server via Crafted protectionAlg

0
Medium
VulnerabilityCVE-2026-63076gcveosvubuntu-cve-2026-63076cve-2026-63076ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-22-04-ltsubuntu-pro-fips-preview-22-04-ubuntu-pro-fips-updates-22-04-ubuntu-24-04-ltsubuntu-pro-fips-updates-24-04-ubuntu-26-04-ltscsafmicrosoft-security-response-ce
Published: 08/27/2026 (08/27/2026, 01:10:43 UTC)
Source: GCVE Database
Vendor/Project: Microsoft Security Response Center
Product: Microsoft

Description

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
nodejs
pkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps/xenial
Affected versions
=0.10.25~dfsg2-2ubuntu1=4.2.2~dfsg-1=4.2.3~dfsg-1=4.2.4~dfsg-1ubuntu1=4.2.4~dfsg-2=4.2.6~dfsg-1ubuntu1=4.2.6~dfsg-1ubuntu4=4.2.6~dfsg-1ubuntu4.1=4.2.6~dfsg-1ubuntu4.2=4.2.6~dfsg-1ubuntu4.2+esm1=4.2.6~dfsg-1ubuntu4.2+esm2=4.2.6~dfsg-1ubuntu4.2+esm3
Ubuntu:Pro:18.04:LTSmore threats →ghsa
nodejs
pkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps/bionic
Affected versions
=6.11.4~dfsg-1ubuntu1=6.11.4~dfsg-1ubuntu2=6.12.0~dfsg-1ubuntu1=6.12.0~dfsg-2ubuntu1=6.12.0~dfsg-2ubuntu2=8.10.0~dfsg-2=8.10.0~dfsg-2ubuntu0.2=8.10.0~dfsg-2ubuntu0.3=8.10.0~dfsg-2ubuntu0.4=8.10.0~dfsg-2ubuntu0.4+esm1=8.10.0~dfsg-2ubuntu0.4+esm2=8.10.0~dfsg-2ubuntu0.4+esm3=8.10.0~dfsg-2ubuntu0.4+esm4=8.10.0~dfsg-2ubuntu0.4+esm5=8.10.0~dfsg-2ubuntu0.4+esm6
Ubuntu:22.04:LTSmore threats →ghsa
openssl
pkg:deb/ubuntu/openssl?arch=source&distro=jammy
Affected versions
<3.0.2-0ubuntu1.29=1.1.1l-1ubuntu1=3.0.0-1ubuntu1=3.0.1-0ubuntu1=3.0.2-0ubuntu1=3.0.2-0ubuntu1.1=3.0.2-0ubuntu1.2=3.0.2-0ubuntu1.4=3.0.2-0ubuntu1.5=3.0.2-0ubuntu1.6=3.0.2-0ubuntu1.7=3.0.2-0ubuntu1.8=3.0.2-0ubuntu1.9=3.0.2-0ubuntu1.10=3.0.2-0ubuntu1.12=3.0.2-0ubuntu1.13=3.0.2-0ubuntu1.14=3.0.2-0ubuntu1.15=3.0.2-0ubuntu1.16=3.0.2-0ubuntu1.17=3.0.2-0ubuntu1.18=3.0.2-0ubuntu1.19=3.0.2-0ubuntu1.20=3.0.2-0ubuntu1.21=3.0.2-0ubuntu1.23=3.0.2-0ubuntu1.25=3.0.2-0ubuntu1.26
Ubuntu:Pro:FIPS-preview:22.04:LTSmore threats →ghsa
openssl
pkg:deb/ubuntu/openssl?arch=source&distro=fips-preview/jammy
Affected versions
=3.0.2-0ubuntu1.10+Fips1=3.0.2-0ubuntu1.12+Fips1
Ubuntu:Pro:FIPS-preview:22.04:LTSmore threats →ghsa
openssl-fips
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-preview/jammy
Affected versions
=3.0.5-0ubuntu0.1+Fips2.1
Ubuntu:Pro:FIPS-updates:22.04:LTSmore threats →ghsa
openssl
pkg:deb/ubuntu/openssl?arch=source&distro=fips-updates/jammy
Affected versions
=3.0.2-0ubuntu1.10+Fips1=3.0.2-0ubuntu1.12+Fips1=3.0.2-0ubuntu1.14+Fips1=3.0.2-0ubuntu1.15+Fips1=3.0.2-0ubuntu1.16+Fips1=3.0.2-0ubuntu1.17+Fips1=3.0.2-0ubuntu1.18+Fips1=3.0.2-0ubuntu1.19+Fips1=3.0.2-0ubuntu1.20+Fips1=3.0.2-0ubuntu1.21+Fips1=3.0.2-0ubuntu1.23+Fips1=3.0.2-0ubuntu1.25+Fips1=3.0.2-0ubuntu1.26+Fips1
Ubuntu:Pro:FIPS-updates:22.04:LTSmore threats →ghsa
openssl-fips
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-updates/jammy
Affected versions
=3.0.5-0ubuntu0.1+Fips2.1=3.0.5-0ubuntu0.2+Fips1
Ubuntu:24.04:LTSmore threats →ghsa
edk2
pkg:deb/ubuntu/edk2?arch=source&distro=noble
Affected versions
=2023.05-2=2023.11-2=2023.11-3=2023.11-4=2023.11-5=2023.11-6=2023.11-8=2024.02-1=2024.02-2=2024.02-2ubuntu0.1=2024.02-2ubuntu0.3=2024.02-2ubuntu0.4=2024.02-2ubuntu0.5=2024.02-2ubuntu0.6=2024.02-2ubuntu0.7=2024.02-2ubuntu0.8=2024.02-2ubuntu0.9
Ubuntu:24.04:LTSmore threats →ghsa
openssl
pkg:deb/ubuntu/openssl?arch=source&distro=noble
Affected versions
<3.0.13-0ubuntu3.15=3.0.10-1ubuntu2=3.0.10-1ubuntu2.1=3.0.10-1ubuntu3=3.0.10-1ubuntu4=3.0.13-0ubuntu2=3.0.13-0ubuntu3=3.0.13-0ubuntu3.1=3.0.13-0ubuntu3.2=3.0.13-0ubuntu3.3=3.0.13-0ubuntu3.4=3.0.13-0ubuntu3.5=3.0.13-0ubuntu3.6=3.0.13-0ubuntu3.7=3.0.13-0ubuntu3.9=3.0.13-0ubuntu3.11=3.0.13-0ubuntu3.12
Ubuntu:Pro:FIPS-updates:24.04:LTSmore threats →ghsa
openssl-fips
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-updates/noble
Affected versions
=3.0.13-0ubuntu3+Fips1=3.0.13-0ubuntu3.6+Fips1=3.0.13-0ubuntu3.12+Fips1
Ubuntu:26.04:LTSmore threats →ghsa
edk2
pkg:deb/ubuntu/edk2?arch=source&distro=resolute
Affected versions
=2025.02-8ubuntu3=2025.11-3ubuntu6=2025.11-3ubuntu7
Ubuntu:26.04:LTSmore threats →ghsa
openssl
pkg:deb/ubuntu/openssl?arch=source&distro=resolute
Affected versions
<3.5.5-1ubuntu3.4=3.5.3-1ubuntu2=3.5.5-1ubuntu1=3.5.5-1ubuntu3=3.5.5-1ubuntu3.2=3.5.5-1ubuntu3.3

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/10/2026, 07:55:46 UTC

Technical Analysis

The vulnerability identified as CVE-2026-63076 involves OpenSSL incorrectly handling the validation of the CMP protection algorithm. This improper validation can be triggered by a crafted protectionAlg value, leading to an invalid pointer dereference and causing OpenSSL to crash. The vulnerability is classified under CWE-476 (NULL Pointer Dereference). It affects various OpenSSL versions distributed across multiple Ubuntu LTS releases, including versions 3.0.x, 3.5.x, and 1.1.1 series, among others. The vendor advisory from Ubuntu confirms that patches are available and provides specific package versions that fix the issue.

Potential Impact

A remote attacker can exploit this vulnerability by sending a specially crafted CMP message with a manipulated protection algorithm field, causing OpenSSL to crash. This results in a denial of service condition. There is no indication of code execution or data disclosure from the provided data. The impact is limited to service disruption due to crashes.

Mitigation Recommendations

Official patches are available from Ubuntu as detailed in security notices USN-8678-1 and USN-8678-2. Users should update their OpenSSL packages to the fixed versions listed in these advisories. After applying updates, a system reboot is recommended to ensure all changes take effect. No additional mitigation steps are indicated by the vendor advisory.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-63076
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:26.04:LTS"]
Cvss Version
3.1

Patch Information

Threat ID: 6a9053e7acd9273b49696873

Added to database: 08/27/2026, 15:12:39 UTC

Last enriched: 09/10/2026, 07:55:46 UTC

Last updated: 10/11/2026, 06:48:17 UTC

Views: 65

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