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CVE-2026-44673

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 7.5 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • libyang

    Versions
    • < SO 5.2.15: Affected

    No fix published

  • libyang Debian:13

    Versions
    • 3.12.2-1
    • 3.13.5-1
    • 3.13.5-2
    • 3.13.6-1
    • 3.13.6-1~bpo13+1
    • 4.2.2-1
    • 4.2.2-2
    • 4.2.2-3
    • 4.3.3-1
    • 4.3.4-1
    • 4.7.3-1
    • 5.0.2-1
    • 5.0.8-1
    • 5.4.1+really5.4.1-1
    • 5.4.1-1
    • 5.4.5-1
    • 5.4.9-1
    • 5.7.1-1
    • 5.8.5-1
    • 5.8.6-1
    • 5.8.6-2
    • 6.1.4-1
    • 6.4.13-1
    • 6.4.3-1
    • 6.4.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libyang Debian:14

    Versions
    • 3.12.2-1
    • 3.13.5-1
    • 3.13.5-2
    • 3.13.6-1
    • 3.13.6-1~bpo13+1
    • 4.2.2-1
    • 4.2.2-2
    • 4.2.2-3
    • 4.3.3-1
    • 4.3.4-1
    • 4.7.3-1
    • 5.0.2-1
    • 5.0.8-1
    • 5.4.1+really5.4.1-1
    • 5.4.1-1
    • 5.4.5-1
    • 5.4.9-1
    • 5.7.1-1
    • 5.8.5-1
    • 5.8.6-1
    • 5.8.6-2
    • 6.1.4-1
    • 6.4.3-1
    • 6.4.6-1
    Affected ranges
    • ECOSYSTEM: < 6.4.13-1

    Update to 6.4.13-1

  • libyang2 Debian:12

    Versions
    • 2.1.148-0.1
    • 2.1.148-0.2
    • 2.1.30-2
    • 2.1.30-2.1
    • 2.1.30-2.1~exp1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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