CVE-2026-0708
Libucl: libucl: denial of service via embedded null byte in ucl input
CVE-2026-0708 is a high vulnerability (CVSS 8.3) in Libucl, published March 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. No source names a fixed version.
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Libucl: libucl: denial of service via embedded null byte in ucl input
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.
- Record
CVE-2026-0708- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
EUVDEUVD-2026-12534
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.
- Record
EUVD-2026-12534- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-gxf2-jfmj-j5cj
A flaw was found in libucl. A remote attacker could exploit this by providing a specially crafted...
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.
- Record
GHSA-gxf2-jfmj-j5cj- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-0708- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
OSV
Libucl: libucl: denial of service via embedded null byte in ucl input
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.
- Record
CVE-2026-0708- CVSS 3.1
- 8.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
Affected products
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-02 | created | CVE List, EUVD, GitHub Advisories, NVD, OSV |
References
access.redhat.com/security/cve/CVE-2026-0708
bugzilla.redhat.com/show_bug.cgi?id=2427770
github.com/vstakhov/libucl/issues/323
nvd.nist.gov/vuln/detail/CVE-2026-0708