What’s Vulnerable › Vulnerabilities

CVE-2026-44673: libyang: lyb_read_string() integer overflow → heap buffer overflow

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-14 · updated 2026-10-26
• Weakness: CWE-190

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.

Affected products

• CESNET libyang: before SO 5.2.15

References

• https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh
• https://access.redhat.com/errata/RHSA-2026:24545
• https://access.redhat.com/errata/RHSA-2026:24758
• https://access.redhat.com/errata/RHSA-2026:25051
• https://access.redhat.com/errata/RHSA-2026:49666
• https://access.redhat.com/errata/RHSA-2026:51339
• https://access.redhat.com/errata/RHSA-2026:51351
• https://access.redhat.com/errata/RHSA-2026:51368
• https://access.redhat.com/errata/RHSA-2026:65467
• https://access.redhat.com/errata/RHSA-2026:65477
• https://access.redhat.com/errata/RHSA-2026:65508
• https://access.redhat.com/security/cve/CVE-2026-44673

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