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openSUSE libyang Important Use-After-Free Heap Overflow Fix 2026-21113-1

opensuse
Calendar Grey June 30, 2026
Dist Opensuse Esm H88
An important security update for openSUSE's libyang addresses two vulnerabilities with installation instructions.
An update that solves 2 vulnerabilities and has 2 bug fixes can now be installed.

Description

This update for libyang fixes the following issues

- CVE-2026-41401: use-after-free in `lyd_parser_set_data_flags` when processing crafted YANG XML documents with specific

metadata attributes (bsc#1266316).

- CVE-2026-44673: integer overflow in `lyb_read_string()` of `src/parser_lyb.c` leads to heap buffer overflow when

parsing a maliciously crafted LYB binary blob (bsc#1265330).

Patch instructions:

To install this openSUSE security update use the suse recommended installation methods

like YaST online_update or "zypper patch".

Alternatively you can run the command listed for your product:

- openSUSE Leap 16.0

zypper in -t patch openSUSE-Leap-16.0-978=1

Topics%20covered

Topics Covered

security advisory important OpenSUSE heap buffer overflow use-after-free libyang

Patch

Package List

- openSUSE Leap 16.0:

libyang-devel-2.1.148-160000.4.1

libyang-doc-2.1.148-160000.4.1

libyang2-2.1.148-160000.4.1

yang-tools-2.1.148-160000.4.1

References

* bsc#1265330

* bsc#1266316

References:

* https://www.suse.com/security/cve/CVE-2026-41401.html

* https://www.suse.com/security/cve/CVE-2026-44673.html

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: openSUSE-SU-2026:21113-1
Rating: important
Affected Products: openSUSE Leap 16.0 -------------------------------------------------------------

Topics%20covered

Topics Covered

security advisory important OpenSUSE heap buffer overflow use-after-free libyang

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