CVE-2026-0708

HIGH

Libucl: libucl: denial of service via embedded null byte in ucl input

Title source: cna

Description

A flaw was found in libucl. A remote attacker could exploit this by providing a specially crafted Universal Configuration Language (UCL) input that contains a key with an embedded null byte. This can cause a segmentation fault (SEGV fault) in the `ucl_object_emit` function when parsing and emitting the object, leading to a Denial of Service (DoS) for the affected system.

References (3)

Core 3

Core References

Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat

https://access.redhat.com/security/cve/CVE-2026-0708

https://github.com/vstakhov/libucl/issues/323

Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat

RHBZ#2427770

https://bugzilla.redhat.com/show_bug.cgi?id=2427770

Scores

CVSS v3 8.3

EPSS 0.0039

EPSS Percentile 30.4%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-125

Status published

Products (2)

libucl/libucl 3e7f023e184e06f30fb5792dacd9dd0f8b692f1b

vstakhov/libucl < 0.9.4

Published Mar 17, 2026

Tracked Since Mar 17, 2026