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VulnerabilityPublished

CVE-2026-55996: SUSE Rancher · Unthrottled Resource Allocation

Affects SUSE RancherSource CVE Database V5

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Not known to be exploited · CVSS 4.3 Medium · fixed in 2.14.4 : update SUSE Rancher when convenient.

Data as of 3 Nov 2026, 22:58 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.14.4, 2.13.8, 2.12.12 +1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 3 Nov 2026.

What to do

Upgrade SUSE Rancher to 2.14.4, 2.13.8, 2.12.12 or 2.11.16.

Affected software

ProductAffectedFixed in
SUSERancherAffected
  • >=2.14.0 <2.14.4
Fixed in
  • 2.14.4
SUSERancherAffected
  • >=2.13.0 <2.13.8
Fixed in
  • 2.13.8
SUSERancherAffected
  • >=2.12.0 <2.12.12
Fixed in
  • 2.12.12
SUSERancherAffected
  • >=2.11.0 <2.11.16
Fixed in
  • 2.11.16
GitHubrancher/rancherpkg:github/rancher/rancherOther threatsAffected
  • 2.11.0 – 2.14.0
4 affected builds
Fixed in–

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

AI-suggested

If you cannot patch yet, configuring an effective CN filter in dynamiclistener to restrict appended hostnames may mitigate the issue, but this is not confirmed by the vendor advisory.

Description

CVE-2026-55996 is a denial-of-service vulnerability in SUSE Rancher affecting multiple TLS listeners. The issue arises because the dynamiclistener library appends any hostname presented via Server Name Indication (SNI) to the serving certificate's Subject Alternative Names (SANs) without effective filtering. An unauthenticated attacker with network access can exploit this by sending many TLS requests with distinct hostnames, causing the certificate to grow excessively large and resulting in TLS handshake failures and service disruption.

References

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