Cloudanix VulnDB

CVE-2026-25537

High · 7.5

CVSS

7.5

EPSS

0.6%

Published

Feb 4, 2026

CISA due date

—

The record

jsonwebtoken is a JWT lib in rust. Prior to version 10.3.0, there is a Type Confusion vulnerability in jsonwebtoken, specifically, in its claim validation logic. When a standard claim (such as nbf or exp) is provided with an incorrect JSON type (Like a String instead of a Number), the library’s internal parsing mechanism marks the claim as “FailedToParse”. Crucially, the validation logic treats this “FailedToParse” state identically to “NotPresent”. This means that if a check is enabled (like: validate_nbf = true), but the claim is not explicitly marked as required in required_spec_claims, the library will skip the validation check entirely for the malformed claim, treating it as if it were not there. This allows attackers to bypass critical time-based security restrictions (like “Not Before” checks) and commit potential authentication and authorization bypasses. This issue has been patched in version 10.3.0.

Affected packages

Ecosystem Package Introduced Fixed
crates.io jsonwebtoken 0 10.3.0
Chainguard komodo-core 0 2.0.0-r0
Chainguard lychee 0 0.22.0-r4
Chainguard py3.10-hf-xet 0 1.2.0-r5
Chainguard py3.11-hf-xet 0 1.2.0-r5
Chainguard py3.12-hf-xet 0 1.2.0-r5
Chainguard py3.13-hf-xet 0 1.2.0-r5
Chainguard qdrant 0 1.16.3-r4
Chainguard uv 0 0.10.2-r1
Chainguard wasmcloud 0 2.0.1-r0
Chainguard zed 0 0.223.3-r0
Wolfi lychee 0 0.22.0-r4
Wolfi py3.10-hf-xet 0 1.2.0-r5
Wolfi py3.11-hf-xet 0 1.2.0-r5
Wolfi py3.12-hf-xet 0 1.2.0-r5
Wolfi py3.13-hf-xet 0 1.2.0-r5
Wolfi qdrant 0 1.16.3-r4
Wolfi uv 0 0.10.2-r1
Wolfi wasmcloud 0 2.0.1-r0
Wolfi zed 0 0.223.3-r0

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