Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Versions of http4k-core before 6.49.0.0 include a function, HmacSha256.hash, that computes a plain unkeyed SHA-256 digest despite the class name suggesting HMAC. The source describes this as a misleading name rather than an exploitable flaw, and says no http4k internal code misuses it; a caller would have to use it as a message authentication code, which the lack of a key parameter makes unlikely. Upgrade to http4k-core 6.49.0.0 or later, where Sha256.hash and Sha256.hmac are provided and HmacSha256 is deprecated.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| Not published | None | 4.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS No score.
Timeline
- 31 Oct 2026, 14:20 UTC First seen by agentprime
- 31 Oct 2026, 14:20 UTC Confirmed by OSV