CVE-2025-45764

JWS integrity weakening via accepted undersized keys

Published Aug 6, 2025 · Updated Aug 26, 2025

Inadequate encryption strength in jsrsasign 11.1.0 allows local users to weaken JWS integrity with undersized HMAC or RSA keys. The report alleges that JWS signing and verification operate with HMAC and RSA keys shorter than cited standards, but identifies no enforcing function. The record is disputed because key length is selected by consuming applications; impact requires an application to use an undersized key.

CVSS severity3.2
Low
EPSS probability0.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inadequate encryption strength in jsrsasign 11.1.0 allows local users to weaken JWS integrity with undersized HMAC or RSA keys. The report alleges that JWS signing and verification operate with HMAC and RSA keys shorter than cited standards, but identifies no enforcing function. The record is disputed because key length is selected by consuming applications; impact requires an application to use an undersized key.

The record

CVE
CVE-2025-45764
Published
Aug 6, 2025
Updated
Aug 26, 2025
Vendor
jsrsasign project
Product
jsrsasign
Classifications
CWE-326
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.1.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

jsrsasign project · jsrsasignversion=11.1.0

Published CVSS scores

3.2MITRECVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength

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

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Your stack

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