CVE-2026-44673
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductCesnet Libyang
PublishedMay 14, 2026
First seenMay 14, 2026
Weakness typeCWE-190Integer overflow
How to fix
Vendor advisories
- access.redhat.com/errata/RHSA-2026:49666
- access.redhat.com/errata/RHSA-2026:24758
- access.redhat.com/errata/RHSA-2026:24545
- access.redhat.com/errata/RHSA-2026:51351
- access.redhat.com/errata/RHSA-2026:51368
- access.redhat.com/errata/RHSA-2026:51339
- access.redhat.com/errata/RHSA-2026:65477
- access.redhat.com/errata/RHSA-2026:65467
- access.redhat.com/errata/RHSA-2026:65508
- access.redhat.com/errata/RHSA-2026:25051
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| CESNET libyang | < SO 5.2.15 | — |
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