DEBIAN-CVE-2026-49852

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Source

https://security-tracker.debian.org/tracker/CVE-2026-49852

Import Source

https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49852.json

JSON Data

https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-49852

Upstream

CVE-2026-49852

Published

2026-07-17T20:17:23Z

Modified

2026-08-27T23:05:31Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator

Summary

[none]

Details

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign and HMACAlgorithm.verify in src/joserfc/_rfc7518/jws_algs.py pass the output of OctKey.get_op_key(...) to hmac.new(...) and OctKey.import_key in src/joserfc/_rfc7518/oct_key.py only emits a SecurityWarning for keys shorter than 14 bytes without rejecting zero-length input. This issue is fixed in version 1.6.8.

References

https://security-tracker.debian.org/tracker/CVE-2026-49852

Affected packages

Debian:13 / joserfc

Package

Name: joserfc
Purl: pkg:deb/debian/joserfc?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.1.0-1

1.2.0-1

1.2.2-1

1.3.1-1

1.3.2-1

1.3.4-1

1.4.0-1

1.4.1-1

1.4.3-1

1.5.0-1

1.6.0-1

1.6.1-1

1.6.2-1

1.6.3-1

1.6.4-1

1.6.5-1

1.6.8-1

1.7.0-1

1.7.1-1

1.7.2-1

1.7.3-1

1.7.4-1

Ecosystem specific

{
    "urgency":  "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49852.json"

Debian:14 / joserfc