7.5

CVE-2023-26917: cesnet libyang NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2023-26917DEBIAN-CVE-2023-26917
Published 11-04-2023Last modified 11-02-2025
Open JSON

Vulnerability summary

CVE-2023-26917 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in cesnet libyang. EPSS estimates a 0.89% chance of exploitation in the next 30 days, higher than 58.8% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.89%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
USN-7752-1

Timeline

  1. 11-04-2023
    PublishedVulnerability first disclosed.
  2. 11-02-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.89%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

0.00 pp

From 0.89% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.89%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Libyang

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • libyang< 3.4.2+dfsg-2
  • libyang2All versions (No fix recorded)
Cesnet1 product
Ubuntu1 product
  • libyang2< 2.1.30-2.1ubuntu0.1

3 vendors · 4 products

References

6 links