GO-2025-4239 ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay in github.com/altcha-org/altcha-lib-go

ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay in github.com/altcha-org/altcha-lib-go...

CVE-2025-68113

ALTCHA is privacy-first software for captcha and bot protection. 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...

CVE-2025-68113 ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay

ALTCHA is privacy-first software for captcha and bot protection. 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...

CVE-2025-68113 ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay

ALTCHA is privacy-first software for captcha and bot protection. 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...

CVE-2025-68113 ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay

ALTCHA is privacy-first software for captcha and bot protection. 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...

EUVD-2025-203484

ALTCHA is privacy-first software for captcha and bot protection. 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...

exordos-core (>=0.0.7 <=0.0.8), genesis-core (>=0.0.2 <=0.0.6) +3 more potentially affected by CVE-2025-68113 via altcha (=0.2.0)

altcha PYPI version =0.2.0 is affected by a known vulnerability. The following packages have a transitive dependency on altcha and may be impacted: - exordos-core =0.0.7, =0.0.2, =5.11.0, =0.1.0, =0.12.0 - wlhosted =2024.11.0 Source cves: CVE-2025-68113 Source advisory: OSV:GHSA-6GVQ-JCMP-8959...

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...

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,...

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...

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,...

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 Proof-of-Work Vulnerable to Challenge Splicing and Replay

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 modified...

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...

CVE-2025-65849

A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the Proof-of-Work nonce in constant time via mathematical deduction. NOTE: this is disputed by the Supplier because the product's objective is "to discourage automated...

@levo-so/react (>=0.1.15 <=0.1.43), @levo-so/react-collection (>=0.0.1 <=0.1.86) +2 more potentially affected by CVE-2025-65849 via altcha (>=1.0.7 <=2.0.2)

altcha NPM version =1.0.7, =0.1.15, =0.0.1, =0.1.91, =0.0.23, =0.0.34 Source cves: CVE-2025-65849 Source advisory: OSV:GHSA-MPMC-QCHH-R9Q8...

GHSA-MPMC-QCHH-R9Q8 Altcha Proof-of-Work obfuscation mode cryptanalytic break

A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the Proof-of-Work nonce in constant time via mathematical deduction...

EUVD-2025-201806

A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the Proof-of-Work nonce in constant time via mathematical deduction...