🛡️ CVE-2026-0708 — libucl

🟠 CVSS 8.3 — High ⚠️ Exploit Public CWE-125 NVD
8.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity low, availability high.

Weakness class

CVE-2026-0708 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.

Affected software

CVE-2026-0708 is recorded against 1 package.

  • libucl (fixed in 0.9.4)

Timeline and source

Published on 17 March 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

access.redhat.com
bugzilla.redhat.com
github.com
github.com

Details

Severity HIGH
CVSS Score 8.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H
CWE CWE-125
Public Exploit ⚠️ Yes
Source NVD
Published 2026-03-17
Updated 2026-08-20
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
libucl — 0.9.4

References

Issue Tracking, Third Party Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2427770
Exploit, Issue Tracking, Vendor Advisory https://github.com/vstakhov/libucl/issues/323
Exploit, Issue Tracking, Vendor Advisory https://github.com/vstakhov/libucl/issues/323

Similar Threats

Exploit Protection

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