7.5

CVE-2026-44673: cesnet libyang Integer Overflow or Wraparound

CVSS: 7.5v3.1HighDeferred
AliasesSUSE-SU-2026:2381-1RHSA-2026:24545RHSA-2026:24758
Published 14-05-2026Last modified 09-09-2026
Open JSON

Vulnerability summary

CVE-2026-44673 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in cesnet libyang. EPSS estimates a 0.95% chance of exploitation in the next 30 days, higher than 60.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.95%
0%100%
Low · +0.41 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 6
OPENSUSE-SU-2026:21113-1SUSE-SU-2026:22200-1SUSE-SU-2026:22208-1SUSE-SU-2026:2334-1SUSE-SU-2026:2335-1SUSE-SU-2026:2337-1

Timeline

  1. 14-05-2026
    PublishedVulnerability first disclosed.
  2. 09-09-2026
    Last modifiedVulnerability information updated.

Description

libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.95%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

+0.41 pp

From 0.54% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.95%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat8 products
  • libyang< 0:2.1.148-1.el9_8.1 | < 0:1.0.184-2.el8_10 | < 0:2.1.148-4.el10_2 | < 0:2.1.148-2.el10_0.1 | < 0:1.0.184-1.el8_8.1 | < 0:1.0.184-1.el8_4.1 | < 0:1.0.184-1.el8_6.1 | < 0:2.1.148-1.el9_4.1 | < 0:2.1.148-1.el9_2.1 | < 0:2.1.148-1.el9_6.1
  • libyang-cpp-debuginfo< 0:1.0.184-2.el8_10
  • libyang-debuginfo< 0:2.1.148-1.el9_8.1 | < 0:1.0.184-2.el8_10 | < 0:2.1.148-4.el10_2 | < 0:2.1.148-2.el10_0.1
  • libyang-debugsource< 0:2.1.148-1.el9_8.1 | < 0:1.0.184-2.el8_10 | < 0:2.1.148-4.el10_2 | < 0:2.1.148-2.el10_0.1
  • libyang-devel< 0:2.1.148-1.el9_8.1 | < 0:2.1.148-4.el10_2
Suse4 products
  • libyang&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 1.0.184-150300.3.9.1
  • libyang&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 1.0.184-150300.3.9.1
  • libyang&distro=SUSE Linux Enterprise Server 15 SP4-LTSS< 1.0.184-150300.3.9.1
  • libyang&distro=SUSE Linux Enterprise Server for SAP Applications 15 SP4< 1.0.184-150300.3.9.1
Debian2 products
  • libyangAll versions (No fix recorded)
  • libyang2All versions (No fix recorded)
Ubuntu2 products
  • libyangAll versions (No fix recorded)
  • libyang2All versions (No fix recorded)
Cesnet1 product
Opensuse1 product
  • libyang&distro=openSUSE Tumbleweed< 3.13.6-3.1

6 vendors · 18 products

References

34 links
Show all 34 references