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CVE-2023-26917: Debian libyang can crash when processing bad input

CVE-2023-26917 · published 3 years ago

Summary

The libyang library used in Debian (versions 2.0.164 through 2.1.30) may try to use a missing piece of data, causing the program to stop unexpectedly. This can happen when specially crafted configuration files are read. Update libyang to a newer version or apply the vendor's patch to prevent the crash.

What to do

Update debian libyang to version 3.4.2+dfsg-2.

Affected software

Ecosystem	Vendor	Product	Affected versions
Debian:13	debian	libyang	< 3.4.2+dfsg-2 Fix: upgrade to 3.4.2+dfsg-2
Debian:14	debian	libyang	< 3.4.2+dfsg-2 Fix: upgrade to 3.4.2+dfsg-2
Debian:12	debian	libyang2	All versions
–	cesnet	libyang	>= 2.0.164, <= 2.1.30 `cpe:2.3:a:cesnet:libyang::::::::`

Original advisory text

libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via the function lysp_stmt_validate_value at lys_parse_mem.c.

References

https://security-tracker.debian.org/tracker/CVE-2023-26917 Vendor Advisory
https://github.com/CESNET/libyang/issues/1987 Third Party Advisory
https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/26xxx/CVE-2023-26917... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2023-26917 Vendor Advisory

Fix within

Internet-facing 14 days

Internal 60 days

Not known to be exploited
Can be exploited automatically
Gives an attacker partial control

Severity

7.5 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-476NULL Pointer Dereference

Timeline

Published11 Apr 2023

Updated3 Nov 2026

First seen15 Sep 2026

Sources

DEBIAN-CVE-2023-26917 · OSV

CVE-2023-26917 · NVD

CVE-2023-26917 · OSV

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