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.
Published: 2026-03-17
Score: 8.3 High
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Apply Workaround
AI Analysis

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Remediation

Vendor Workaround

To mitigate this issue, applications utilizing `libucl` should avoid processing untrusted input that contains keys with embedded null bytes, especially when operating in `UCL_PARSER_ZEROCOPY` mode. Restricting input to trusted sources can reduce exposure.

Tracking

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Advisories

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History

Mon, 11 May 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Vstakhov
Vstakhov libucl
CPEs cpe:2.3:a:vstakhov:libucl:*:*:*:*:*:*:*:*
Vendors & Products Vstakhov
Vstakhov libucl

Tue, 17 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 17 Mar 2026 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Libucl
Libucl libucl
Vendors & Products Libucl
Libucl libucl

Tue, 17 Mar 2026 03:30:00 +0000

Type Values Removed Values Added
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.
Title Libucl: libucl: denial of service via embedded null byte in ucl input
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 8.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: fedora

Published:

Updated: 2026-03-17T13:26:47.057Z

Reserved: 2026-01-08T03:31:35.226Z

Link: CVE-2026-0708

cve-icon Vulnrichment

Updated: 2026-03-17T13:26:35.337Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-17T04:16:07.750

Modified: 2026-05-11T17:14:50.693

Link: CVE-2026-0708

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-24T10:49:37Z

Weaknesses