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CVE-2026-63073VulnerabilityPublished Updated

Microsoft · Untrusted Sender DN Used as Format String in CMP Response Validation

Affects MicrosoftSource GCVE Database

0

Not known to be exploited : upgrade to 3.5.5-1ubuntu3.4 when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity
Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS
1.1% chance of exploitation in 30 days – higher than 66% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.5.5-1ubuntu3.4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade the Ubuntu openssl package to 3.5.5-1ubuntu3.4.

Affected software

ProductAffectedFixed in
Ubuntu 26.10edk2pkg:deb/ubuntu/edk2?arch=source&distro=stonkingOther threatsAffected
  • 2025.11-3ubuntu7 – 2026.05-2ubuntu3
5 affected builds
Fixed in–
Ubuntu 26.10edk2-hwepkg:deb/ubuntu/edk2-hwe?arch=source&distro=stonkingOther threatsAffected
  • 2025.11-3ubuntu8 – 2026.05-2ubuntu3
5 affected builds
Fixed in–
Ubuntu 26.04 LTSedk2pkg:deb/ubuntu/edk2?arch=source&distro=resoluteOther threatsAffected
  • 2025.02-8ubuntu3 – 2025.11-3ubuntu7.3
5 affected builds
Fixed in–
Ubuntu 26.04 LTSedk2-hwepkg:deb/ubuntu/edk2-hwe?arch=source&distro=resoluteOther threatsAffected
  • =2025.11-3ubuntu6
  • =2025.11-3ubuntu8
  • =2025.11-3ubuntu8.2
Fixed in–
Ubuntu 26.04 LTSopensslpkg:deb/ubuntu/openssl?arch=source&distro=resoluteOther threatsAffected
  • <3.5.5-1ubuntu3.4
Fixed in
  • 3.5.5-1ubuntu3.4
Ubuntu Pro 18.04 LTSnodejspkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps/bionicOther threatsAffected
  • 6.11.4~dfsg-1ubuntu1 – 8.10.0~dfsg-2ubuntu0.4+esm6
15 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

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

Reports on CVE-2026-63073

References

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