Jervis Has a SHA-256 Hex String Padding Bug
Vulnerability
padLeft(32, '0') should be padLeft(64, '0'). SHA-256 produces 32 bytes = 64 hex characters.
Impact
- Inconsistent hash lengths when leading bytes are zero
- Comparison failures for hashes with leading zeros
- Potential security issues in hash-based comparisons
- Could cause subtle bugs in systems relying on consistent hash lengths
Severity is considered low for internal uses of this library but if there's any consumer using these methods directly then this is considered high.
Patches
Upgrade to Jervis 2.2.
Workarounds
Use an alternate SHA-256 hash function or upgrade.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | net.gleske:jervis | < 2.2 | 2.2 |
References
- https://github.com/samrocketman/jervis/security/advisories/GHSA-67rj-pjg6-pq59
- https://nvd.nist.gov/vuln/detail/CVE-2025-68702
- https://github.com/samrocketman/jervis/commit/c3981ff71de7b0f767dfe7b37a2372cb2a51974a
- https://github.com/samrocketman/jervis
- https://github.com/samrocketman/jervis/blob/157d2b63ffa5c4bb1d8ee2254950fd2231de2b05/src/main/groovy/net/gleske/jervis/tools/SecurityIO.groovy#L622-L626
- http://github.com/samrocketman/jervis/commit/c3981ff71de7b0f767dfe7b37a2372cb2a51974a
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- Weakness (CWE)
CWE-327- Platform
- Java / Kotlin (Maven)
- Package
net.gleske:jervis- Disclosed
- 13.01.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-67rj-pjg6-pq59 - CC BY 4.0
Vulnerability history: net.gleske:jervis
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 01.2026 01.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 6
- Medium 1
Disclosures per year
- 2026: 7
-
Jervis Has a SHA-256 Hex String Padding Bug this entry
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