Memory Exhaustion Vulnerability in Pomerium Identity Access Proxy
CVE-2026-50285

7.5HIGH

Key Information:

Vendor

Pomerium

Status
Pomerium
Vendor
CVE Published:
17 September 2026

What is CVE-2026-50285?

The Pomerium identity and context-aware access proxy prior to version 0.32.8 contains a vulnerability in the decodeQueryStringV2 function, which handles zstd decompression of untrusted input without an output-memory restriction. An unauthenticated attacker could exploit this flaw in hosted or stateless deployments by sending a specially crafted payload to the callback endpoint, leading to excessive memory allocation that could crash or degrade the service. This vulnerability is not present in stateful deployments due to HMAC signature verification before decryption. Users are advised to upgrade to version 0.32.8 or later to mitigate this risk.

Affected Version(s)

pomerium < 0.32.8

References

https://github.com/pomerium/pomerium/security/advisories/...
x_refsource_CONFIRM
https://github.com/pomerium/pomerium/commit/593eb81c7e5bd...
x_refsource_MISC
https://github.com/pomerium/pomerium/releases/tag/v0.32.8
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.