CAP JWT claims validation bypass using non-canonical claim names
Severity and exploitation
KEV coverage does not rule out exploitation.
Assessment vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:NSeverity
medium5.9CVSS measures technical severity, not the likelihood of an attack.
Known exploitation
Not listed in the checked CISA KEV catalog
Absence from CISA KEV does not rule out attacks.
Public exploit
Not established by this record
Missing evidence does not mean no public exploit exists.
Remediation
Fix status not established
No structured fix or guidance is available here. Check the latest publisher advisory.
What this means
HashiCorp cap JWT validation library versions before 0.14.0 are vulnerable to a claims validation bypass, potentially causing incorrect authorization decisions. Exploitation requires attacker-controlled claims in a trusted JWT. The weakness is due to improper handling of case sensitivity.
Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.Attack conditions
Exploitation requires attacker-controlled claims in a JWT signed by a key trusted by the application.
Excerpt from the original source description below.
Review supporting sources →Affected versions
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HashiCorp · HashiCorp
Shared library
1 range
HashiCorp · HashiCorp
Shared library
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affected
0 → before 0.14.0
semver versions
Other versions: unaffected
What to do
Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.
No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.
cve.new guidance unless attributed to a publisher. This page does not inspect your installation.
Public exploit evidence
No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.
Original source description
Read the full publisher description
The HashiCorp cap JWT validation library before version 0.14.0 is vulnerable to a claims validation bypass that may cause downstream applications to make authorization decisions using claim values different from those validated. Exploitation requires attacker-controlled claims in a JWT signed by a key trusted by the application. This vulnerability (CVE-2026-19194) is fixed in cap 0.14.0.
References
1 sourcesInside the record
Evidence available
Describes the evidence in this view, not whether the product is safe.
Original records
CVE-2026-19194View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.
cve.new JSON →Underlying weaknesses
The source’s classification of what caused the vulnerability.
Contributing organizations · 2
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Additional data publisher
Timeline
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Source updated
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Last imported by cve.new
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What changed
Follow changesLarge field values are marked as truncated previews. Original source snapshots remain retained.