Vulnerability in Altcha-org Altcha-lib
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 c…
EPSS: 0.001 (21.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
Affected products
- Altcha-org Altcha-lib — versions < 1.4.1
Weakness classification (CWE)
References
- https://github.com/altcha-org/altcha-lib/security/advisories/GHSA-6gvq-jcmp-8959 (x_refsource_CONFIRM)
- https://github.com/altcha-org/altcha-lib-ex/commit/09b2bad466ad0338a5b24245380950ea9918333e (x_refsource_MISC)
- https://github.com/altcha-org/altcha-lib-go/commit/4a5610745ef79895a67bac858b2e4f291c2614b8 (x_refsource_MISC)
- https://github.com/altcha-org/altcha-lib-java/commit/69277651fdd6418ae10bf3a088901506f9c62114 (x_refsource_MISC)
- https://github.com/altcha-org/altcha-lib-php/commit/9e9e70c864a9db960d071c77c778be0c9ff1a4d0 (x_refsource_MISC)
- https://github.com/altcha-org/altcha-lib-rb/commit/4fd7b64cbbfc713f3ca4e066c2dd466e3b8d359b (x_refsource_MISC)
- https://github.com/altcha-org/altcha-lib/commit/cb95d83a8d08e273b6be15e48988e7eaf60d5c08 (x_refsource_MISC)
- https://github.com/altcha-org/altcha-lib-java/releases/tag/v1.3.0 (x_refsource_MISC)
- https://github.com/altcha-org/altcha-lib-php/releases/tag/v1.3.1 (x_refsource_MISC)
- https://github.com/altcha-org/altcha-lib/releases/tag/1.4.1 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-68113?
- CVE-2025-68113 is a medium-severity vulnerability in Altcha-org Altcha-lib, classified under CWE-115. CVSS score: 6.5/10. Published 2025-12-16.
- How severe is CVE-2025-68113?
- Medium severity. CVSS v3 base score is 6.5 out of 10.