libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via…
Priority HIGH 72CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Deferred Red Hat: fix deferred
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via the function lysp_stmt_validate_value at lys_parse_mem.c.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00893 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Deferred Red Hat: fix deferred
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-26917
- 2026-10-03 Alias added: GHSA-8fpx-68qp-g9qc
References
More CESNET Libyang vulnerabilities
- TI-2019-13946 Stack-based buffer overflow in Red Hat libyang CVSS 3.1CRITICAL 9.8
- TI-2019-13945 Stack-based buffer overflow in Red Hat libyang CVSS 3.1CRITICAL 9.8
- TI-2019-14631 A double-free is present in libyang before v1.0-r1 in the function yyparse() when an… CVSS 3.1HIGH 8.8
- TI-2019-14628 A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type… CVSS 3.1HIGH 8.8
- TI-2019-14627 A double-free is present in libyang before v1.0-r1 in the function yyparse() when an… CVSS 3.1HIGH 8.8
- TI-2021-09854 A stack overflow in libyang <= v1.0.225 can cause a denial of service through function… CVSS 3.1HIGH 7.5
Sources
- CVE-2023-26917 · CVE Program
- CVE-2023-26917 · NVD
- FIRST EPSS
- GHSA-8fpx-68qp-g9qc · GitHub Advisory Database · CC BY 4.0
- CVE-2023-26917 · Red Hat security data · CC BY 4.0
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