CVE-2026-0708
Libucl: libucl: denial of service via embedded null byte in ucl input
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.
INFO
Published Date :
March 17, 2026, 4:16 a.m.
Last Modified :
May 11, 2026, 5:14 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update libucl to the latest version.
- Apply vendor patches for libucl.
- Avoid processing untrusted UCL input.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-0708.
| URL | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-0708 | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2427770 | Third Party Advisory Issue Tracking |
| https://github.com/vstakhov/libucl/issues/323 | Issue Tracking Vendor Advisory Exploit |
| https://github.com/vstakhov/libucl/issues/323 | Issue Tracking Vendor Advisory Exploit |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-0708 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-0708
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-0708 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-0708 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 11, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:vstakhov:libucl:*:*:*:*:*:*:*:* versions up to (including) 0.9.4 Added Reference Type Fedora Project: https://access.redhat.com/security/cve/CVE-2026-0708 Types: Third Party Advisory Added Reference Type Fedora Project: https://bugzilla.redhat.com/show_bug.cgi?id=2427770 Types: Issue Tracking, Third Party Advisory Added Reference Type CISA-ADP: https://github.com/vstakhov/libucl/issues/323 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type Fedora Project: https://github.com/vstakhov/libucl/issues/323 Types: Exploit, Issue Tracking, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 17, 2026
Action Type Old Value New Value Added Reference https://github.com/vstakhov/libucl/issues/323 -
New CVE Received by [email protected]
Mar. 17, 2026
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H Added CWE CWE-125 Added Reference https://access.redhat.com/security/cve/CVE-2026-0708 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2427770 Added Reference https://github.com/vstakhov/libucl/issues/323