CVE-2015-10004: Token validation methods are susceptible to a timing side-channel during HMAC comparison

This month

HIGH 7.5REMOTEMITIGATE

CVE-2015-10004 is a high-severity flaw (CVSS 7.5) affecting json web token. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Token validation methods are susceptible to a timing side-channel during HMAC comparison. With a large enough number of requests over a low latency connection, an attacker may use this to determine the expected HMAC.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-668
Published	2022-12-27
Last modified	2026-06-17

Publisher (CNA): Go Project · Vendor: json web token project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-27 22:15 UTCPublished CVE record published
2026-06-17 00:21 UTCUpdated Record last modified

json web token project json web token MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy json-web-token || rpm -q json-web-token || json-web-token --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-10004?

json web token: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-10004 being exploited?

CVE-2015-10004 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-10004 affect?

CVE-2015-10004 affects json web token. Severity is high (CVSS 7.5). Token validation methods are susceptible to a timing side-channel during HMAC comparison. With a large enough number of requests over a low latency connection, an attacker may use this to determine the expected HMAC.

How urgent is CVE-2015-10004?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

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CVE-2023-48238 HIGH 7.5 UPGRADE joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a c

References

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