CVE-2016-10555
CVE-2016-10555 is a medium-severity vulnerability in Jwt-simple Project Jwt-simple with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- CVSS v2: 4.0
- EPSS exploit prediction: 5% (91st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-310
- Affected product: Jwt-simple Project Jwt-simple
- Published:
- Last modified:
Description
Since "algorithm" isn't enforced in jwt.decode()in jwt-simple 0.3.0 and earlier, a malicious user could choose what algorithm is sent sent to the server. If the server is expecting RSA but is sent HMAC-SHA with RSA's public key, the server will think the public key is actually an HMAC private key. This could be used to forge any data an attacker wants.
Frequently asked questions
- What is CVE-2016-10555?
- Since "algorithm" isn't enforced in jwt.decode()in jwt-simple 0.3.0 and earlier, a malicious user could choose what algorithm is sent sent to the server. If the server is expecting RSA but is sent HMAC-SHA with RSA's public key, the server will think the public key is actually an HMAC private key. This could be used to forge any data an attacker wants.
- How severe is CVE-2016-10555?
- CVE-2016-10555 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2016-10555 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2016-10555?
- CVE-2016-10555 affects Jwt-simple Project Jwt-simple. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2016-10555?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2016-10555 published?
- CVE-2016-10555 was published on 2018-05-31 and last updated on 2026-06-17.
References
- https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/
- https://github.com/hokaccha/node-jwt-simple/pull/14
- https://github.com/hokaccha/node-jwt-simple/pull/16
- https://nodesecurity.io/advisories/87
Affected products (1)
- cpe:2.3:a:jwt-simple_project:jwt-simple:*:*:*:*:*:node.js:*:*
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