Medium severity · published Jul 8, 2026
CVE-2026-55432
Coder's sub-agent app registration bypasses template port-sharing policy enforcement
5.4
CVSS
0.3%
EPSS
No
On KEV
Description
Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, the `CreateSubAgent` RPC did not validate a requested app sharing level against the template's `MaxPortSharingLevel` before persisting workspace apps, letting a workspace owner exceed the administrator's configured maximum. Exploitation requires the ability to register sub-agent apps in a workspace the attacker controls. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2clamps the sub-agent app sharing level to the template's `MaxPortSharingLevel`. As a workaround, disable wildcard app hostnames (`CODER_WILDCARD_ACCESS_URL`) to block subdomain-based app routing.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
coder · coder
>= 2.34.0, < 2.34.2; >= 2.33.0, < 2.33.8; >= 2.30.0, < 2.32.7; < 2.29.17 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55432
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55432
Issue Tracking
https://github.com/coder/coder/pull/26061
Release Notes
https://github.com/coder/coder/releases/tag/v2.29.17
Release Notes
https://github.com/coder/coder/releases/tag/v2.32.7
Release Notes
https://github.com/coder/coder/releases/tag/v2.33.8
Release Notes
https://github.com/coder/coder/releases/tag/v2.34.2
Patch
https://github.com/coder/coder/security/advisories/GHSA-x9qq-2qh5-8rxf
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