CVE-2026-0708Libucl: libucl: denial of service via embedded null byte in ucl input
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H
- Weakness (CWE)
- CWE-125
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- fedora
- NVD analysis
- Analyzed
- Record last updated
- Mar 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
libucl libucl libucl:libucl (from the name) | 3e7f023e184e06f30fb5792dacd9dd0f8b692f1b | CNA record |
vstakhov libucl vstakhov:libucl | through 0.9.4 | NVD |
References
- https://access.redhat.com/security/cve/CVE-2026-0708vdb-entry, x-refsource-redhat, third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2427770issue-tracking, x-refsource-redhat, third-party-advisory
- https://github.com/vstakhov/libucl/issues/323exploit, issue-tracking, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.