GHSA-6GVQ-JCMP-8959 ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay

Impact A cryptographic semantic binding flaw in ALTCHA libraries allows challenge payload splicing, which may enable replay attacks. The HMAC signature does not unambiguously bind challenge parameters to the nonce, allowing an attacker to reinterpret a valid proof-of-work submission with a modifi...

altcha-solver (=1.0.2) potentially affected by CVE-2025-68113 via altcha-lib (=0.3.0)

altcha-lib NPM version =0.3.0 is affected by a known vulnerability. The following packages have a transitive dependency on altcha-lib and may be impacted: - altcha-solver =1.0.2 Source cves: CVE-2025-68113 Source advisory: OSV:GHSA-6GVQ-JCMP-8959...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the HMAC computation. An attacker can bypass intended challenge expiration and reuse previously solved challenges by submitting a valid proof-of-work with a modified expiration value,...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the HMAC computation. An attacker can bypass intended challenge expiration and reuse previously solved challenges by submitting a valid proof-of-work with a modified expiration value,...

Improper Verification of Cryptographic Signature

Overview altcha is a The ALTCHA Python Library is a lightweight, zero-dependency library designed for creating and verifying ALTCHA challenges, specifically tailored for Python applications. Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via t...

Improper Verification of Cryptographic Signature

Overview altcha-lib is an A library for creating and verifying ALTCHA challenges for Node.js, Bun and Deno. Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the HMAC computation. An attacker can bypass intended challenge expiration and reuse...