EUVD-2026-37805
GHSA-wphv-vfrh-23q5
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Network-reachable token submission requires no auth; availability impact is limited resource exhaustion, not crash; zero confidentiality or integrity impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
3DescriptionCVE.org
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In versions 1.3.4 through 1.6.5, joserfc accepts oversized RFC7797 b64=false JWS payloads without applying JWSRegistry.max_payload_length, which can lead to resource exhaustion. The normal JWS compact and flattened JSON paths reject payloads above the configured payload-size limit with ExceededSizeError. The RFC7797 unencoded payload paths do not make the same check. A valid b64=false compact or flattened JSON JWS can therefore deserialize successfully with a payload larger than JWSRegistry.max_payload_length. Applications that accept lower-trust JWS values and rely on joserfc to reject oversized token content during verification have a moderate availability risk. This issue has been fixed in version 1.6.7.
AnalysisAI
Resource exhaustion in joserfc (versions 1.3.4-1.6.5) is possible because the RFC7797 unencoded-payload (b64=false) JWS code path skips the configured JWSRegistry.max_payload_length check, while the standard compact and flattened JSON paths correctly raise ExceededSizeError. Remotely submitted, cryptographically valid b64=false JWS tokens with arbitrarily large payloads are deserialized without size enforcement, consuming memory or CPU on the verifying server. …
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Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application accepts JWS tokens bearing the RFC7797 'b64=false' critical header parameter from untrusted or lower-trust callers, and that it relies on joserfc's JWSRegistry.max_payload_length enforcement to bound payload size rather than applying an independent size check before token deserialization. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.3 (Medium) with vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L correctly characterizes this as a remotely reachable, low-complexity denial-of-service issue limited to availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker targeting an application that accepts externally supplied JWS tokens - such as a token-validated API endpoint - crafts a syntactically valid JWS with the RFC7797 b64=false header and a multi-megabyte unencoded payload, then submits it repeatedly or with maximum size. Because joserfc's RFC7797 deserialization path omits the max_payload_length check, the server allocates memory proportional to the payload on each verification call, leading to elevated memory consumption or CPU saturation. … |
| Remediation | Vendor-released patch: version 1.6.7, available at https://github.com/authlib/joserfc/releases/tag/1.6.7. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
View allVendor StatusVendor
SUSE
Severity: Moderate| Product | Status |
|---|---|
| openSUSE Tumbleweed | Fixed |
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