CVE-2023-26917

Exp

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.

Published: 2023-04-11 Last update: 2025-02-11 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-26917 is rated High Exploit Risk (64.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.89%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2023-26917

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-26917

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.30% 0.89% +0.59%
2 2026-04-19 0.08% 0.30% +0.23%
3 2025-11-21 — 0.08% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-26917

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-26917

OS Trackers for CVE-2023-26917

vendor priority summary link
alpine — CVE-2023-26917: 1 source package rows (libyang); 1 state rows across 1 repos (3.17-community); fixed 0, open 1. https://security.alpinelinux.org/vuln/CVE-2023-26917
debian not yet assigned CVE-2023-26917 not yet assigned priority: Debian including 2 source packages (libyang, libyang2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2023-26917
redhat low — https://access.redhat.com/security/cve/CVE-2023-26917
suse medium CVE-2023-26917 severity moderate: SUSE including 3 source package names (libyang, libyang-extentions, libyang1), 30 product×package rows across 10 product lines (SUSE Enterprise Storage 7.1, SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS, … (10 product lines)): Known Not Affected 30. https://www.suse.com/security/cve/CVE-2023-26917/
ubuntu medium CVE-2023-26917 medium priority: Ubuntu including 2 source packages (libyang, libyang2), 16 status rows across 12 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): DNE 5, not-affected 5, ignored 3, needs-triage 2, released 1. https://ubuntu.com/security/CVE-2023-26917

Affected software / configurations for CVE-2023-26917

Vendor Product Version Raw CPE
cesnet libyang >= 2.0.164, <= 2.1.30 cpe:2.3:a:cesnet:libyang:*:*:*:*:*:*:*:*

References for CVE-2023-26917

URL Tags
https://github.com/CESNET/libyang/issues/1987 Exploit Issue Tracking
cvelogic Threat Intelligence