CVE-2026-19362 in oidc-authorizer
Summary
by MITRE • 08/09/2026
A vulnerability has been found in lmammino oidc-authorizer 0.4.0. This issue affects the function parse_token_from_header of the file src/parse_token_from_header.rs of the component Authorization Header Parsing. The manipulation of the argument authorization_token leads to denial of service. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability identified in lmammino oidc-authorizer version 0.4.0 represents a critical denial of service weakness within the authorization header parsing functionality. This issue specifically targets the parse_token_from_header function located in src/parse_token_from_header.rs, where improper handling of the authorization_token argument creates a pathway for malicious actors to disrupt system operations. The flaw exists at the intersection of input validation and token processing, making it particularly dangerous as it can be exploited remotely without requiring authentication or privileged access. The vulnerability's classification aligns with CWE-400, which encompasses denial of service weaknesses in software systems, and demonstrates how seemingly benign parameter handling can create significant operational risks.
The technical implementation of this vulnerability stems from inadequate input sanitization within the authorization header parsing component. When an attacker crafts a malicious authorization_token argument, the parse_token_from_header function fails to properly validate or handle unexpected input patterns, leading to system instability or complete service disruption. This type of flaw typically manifests through resource exhaustion, stack corruption, or infinite loop conditions that prevent legitimate users from accessing authorized services. The remote exploitability aspect means attackers can target vulnerable systems over network connections without requiring physical access or local privileges, amplifying the potential impact across distributed environments.
Operational impacts of this vulnerability extend beyond simple service interruption to encompass broader security implications for organizations relying on OIDC authorization frameworks. The denial of service condition can affect authentication workflows, potentially blocking legitimate user access while attackers maintain persistent disruption capabilities. This weakness undermines the integrity of the authorization process and creates opportunities for more sophisticated attacks that may leverage the initial disruption as a foothold for further exploitation. Organizations using this specific version of the oidc-authorizer component face increased risk of operational downtime, user frustration, and potential credential compromise through cascading security failures.
Mitigation strategies should prioritize immediate patching or version updates to address the underlying parsing vulnerability in the authorization header processing logic. System administrators must implement robust input validation controls that sanitize all authorization token formats before processing, utilizing principle of least privilege configurations to limit potential damage from malformed inputs. Network-level protections including rate limiting and connection monitoring can help detect and prevent exploitation attempts while maintaining service availability for legitimate users. The ATT&CK framework's T1499 technique for network denial of service should be considered when developing defensive strategies, as this vulnerability creates opportunities for attackers to leverage the authorization parsing flaw for broader operational disruption. Organizations should also implement comprehensive monitoring solutions that can detect anomalous authorization header patterns and trigger automated response mechanisms to prevent exploitation attempts from succeeding.
The lack of vendor response to early disclosure creates additional operational challenges for affected organizations, highlighting the importance of proactive security measures when dealing with unmaintained or unsupported software components. Security teams must consider alternative mitigation approaches including temporary workarounds, code audits, or migration away from vulnerable components until proper patches are available through official channels. This vulnerability demonstrates the critical need for maintaining updated security practices and vendor communication protocols to ensure timely resolution of identified weaknesses in widely-used authentication libraries and frameworks.