---
title: "CVE-2026-53938: OpenIDC cjose - Out of Bounds Read/Write"
description: "OpenIDC cjose < 0.6.2.5 contains a buffer overflow caused by lack of length validation on attacker-supplied encrypted_key in AES Key Wrap algorithms during JWE decryption, letting remote unauthenticated attackers cause heap corruption and denial of service, exploit requires crafted JWE input."
url: https://panop.io/threat-heartbeat/CVE-2026-53938/
---

# CVE-2026-53938 OpenIDC cjose - Out of Bounds Read/Write

OpenIDC cjose < 0.6.2.5 contains a buffer overflow caused by lack of length validation on attacker-supplied encrypted\_key in AES Key Wrap algorithms during JWE decryption, letting remote unauthenticated attackers cause heap corruption and denial of service, exploit requires crafted JWE input.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.24% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-53938)

## Details

Type

Out of Bounds Read/Write

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Published

9 September 2026

Updated

15 October 2026

Weakness

[CWE-122](https://cwe.mitre.org/data/definitions/122.html)

## Vendor fix

Upgrade to cjose version 0.6.2.5 or later; alternatively, reject AES Key Wrap algorithms for untrusted JWEs.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-53938](https://nvd.nist.gov/vuln/detail/CVE-2026-53938)
- [https://github.com/OpenIDC/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5](https://github.com/OpenIDC/cjose/commit/8c51d245273583a658f24ef7b08ba22f848a34a5)
- [https://github.com/OpenIDC/cjose/security/advisories/GHSA-75r7-f5cv-g3wj](https://github.com/OpenIDC/cjose/security/advisories/GHSA-75r7-f5cv-g3wj)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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