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The processing time for parsing some invalid inputs scales non-linearly with respect to the size of the input. This affects programs which parse untrusted PEM inputs.

CVE-2025-61723 is a vulnerability classified under CWE-407 (Inefficient Algorithmic Complexity) found in the Go standard library's encoding/pem package. The issue arises because the parsing algorithm for PEM-encoded data exhibits non-linear processing time growth when handling certain malformed or invalid inputs. Specifically, as the size of crafted invalid PEM inputs increases, the CPU time required to parse them grows disproportionately, leading to potential resource exhaustion. This flaw can be exploited remotely without authentication or user interaction by sending specially crafted PEM data to applications that utilize the vulnerable Go library for PEM parsing, such as TLS certificate processing or cryptographic key handling. The vulnerability affects all Go versions from 0 up to and including 1.25.0. The CVSS v3.1 base score is 7.5, reflecting a high severity due to the network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to availability (denial of service). No known public exploits have been reported yet, but the vulnerability could be leveraged to cause denial-of-service conditions by overwhelming CPU resources, potentially disrupting critical services. The lack of a patch link indicates that a fix may still be pending or in development. Organizations using Go for services exposed to untrusted PEM inputs should be aware of this risk and prepare mitigation strategies.

Detailed information about CVE-2025-61723: CWE-407: Inefficient Algorithmic Complexity in Go standard library encoding/pem affecting Go standard library encodin

CVE-2025-61723: CWE-407: Inefficient Algorithmic Complexity in Go standard library encoding/pem - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-61723: CWE-407: Inefficient Algorithmic Complexity in Go standard library encoding/pem

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