CVE-2025-45767Network attack vector

Unspecified impact via unenforced HMAC key length

Published Aug 1, 2025 · Updated Aug 21, 2025

Weak encryption in panva jose 6.0.10 allows attackers to cause unspecified impact through short HMAC secrets in JSON Web Signatures. The reported locus is HMAC signing, where the library accepts caller-supplied secrets without enforcing a minimum length; RSA keys below 2,048 bits are rejected. Exploitation requires an application to supply a short HMAC secret, and the maintainer disputes any security impact because final standards leave symmetric-secret selection to applications.

CVSS severity7.0
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Weak encryption in panva jose 6.0.10 allows attackers to cause unspecified impact through short HMAC secrets in JSON Web Signatures. The reported locus is HMAC signing, where the library accepts caller-supplied secrets without enforcing a minimum length; RSA keys below 2,048 bits are rejected. Exploitation requires an application to supply a short HMAC secret, and the maintainer disputes any security impact because final standards leave symmetric-secret selection to applications.

The record

CVE
CVE-2025-45767
Published
Aug 1, 2025
Updated
Aug 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-327
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo