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hex altcha vulnerabilities

1 published CVE affecting hex altcha, from public sources (CVE.org, NVD, CISA KEV, FIRST EPSS, OSV).

Total
1
Critical
0
High
0
Medium
1
Low
0
Unscored
0
CISA KEV
0

Latest hex altcha CVEs

Newest publication first

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

    Published
    MediumCVSS 6.5 EPSS 0.46% PoC

    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, allowin...

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.