CMS_decrypt() · Multi-RecipientInfo Bleichenbacher Oracle
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in 3.5.3-1ubuntu3.4 : update Microsoft when convenient.
Data as of 26 Oct 2026, 12:55 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.8% chance of exploitation in 30 days – higher than 56% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 3.5.3-1ubuntu3.4, 3.5.5-1ubuntu3.2
Exploitation evidence
Disclosed: evidence found.
CVE published 13 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 to 3.5.3-1ubuntu3.4 (package) or 3.5.5-1ubuntu3.2 (package).
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10edk2pkg:deb/ubuntu/edk2?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10edk2-hwepkg:deb/ubuntu/edk2-hwe?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSedk2pkg:deb/ubuntu/edk2?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSedk2-hwepkg:deb/ubuntu/edk2-hwe?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSopensslpkg:deb/ubuntu/openssl?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 25.10edk2pkg:deb/ubuntu/edk2?arch=source&distro=questingOther threats | Affected
| 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