CVE-2026-44673
libyang: lyb_read_string() integer overflow → heap buffer overflow
- State
- Published
- Severity
- 7.5 High
- Published
- May 14, 2026
- Updated
- Sep 9, 2026
- Reserved
- May 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
- CWE-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
libyangCESNET |
|
References
- https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh
- https://access.redhat.com/security/cve/CVE-2026-44673vdb-entry
- RHBZ#2477617issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44673.json
- https://access.redhat.com/errata/RHSA-2026:49666vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:24758vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:24545vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:51351vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:51368vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:51339vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:65477vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:65467vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:65508vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25051vendor-advisory
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