Vulnerability-Lookup

SUSE-SU-2026:2337-1

Vulnerability from csaf_suse - Published: 2026-06-10 08:43 - Updated: 2026-06-10 08:43

Summary

Security update for libyang

Severity

Important

Notes

Title of the patch: Security update for libyang

Description of the patch: 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).

Patchnames: SUSE-2026-2337,SUSE-SLE-Module-Server-Applications-15-SP7-2026-2337

CVE-2026-41401

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.x86_64	—	Vendor Fix

Threats

Impact important

CVE-2026-44673

8.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.x86_64	—	Vendor Fix

Threats

Impact important

References

12 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1265330	self
https://bugzilla.suse.com/1266316	self
https://www.suse.com/security/cve/CVE-2026-41401/	self
https://www.suse.com/security/cve/CVE-2026-44673/	self
https://www.suse.com/security/cve/CVE-2026-41401	external
https://bugzilla.suse.com/1266316	external
https://www.suse.com/security/cve/CVE-2026-44673	external
https://bugzilla.suse.com/1265330	external

JSON

To clipboard

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  "vulnerabilities": [
    {
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      "ids": [
        {
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          "text": "https://www.suse.com/security/cve/CVE-2026-41401"
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          "text": "libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries. Attackers can trigger this vulnerability by submitting crafted YANG XML documents with specific metadata attributes to applications parsing untrusted XML data, causing process crashes or potential code execution.",
          "title": "CVE description"
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      "threats": [
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          "date": "2026-06-10T08:43:47Z",
          "details": "important"
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      "title": "CVE-2026-41401"
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    {
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      "ids": [
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          "text": "https://www.suse.com/security/cve/CVE-2026-44673"
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        {
          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
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          "url": "https://www.suse.com/security/cve/CVE-2026-44673"
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.aarch64",
            "SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.ppc64le",
            "SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.s390x",
            "SUSE Linux Enterprise Module for Server Applications 15 SP7:libyang2-2.1.148-150700.3.5.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-10T08:43:47Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-44673"
    }
  ]
}

CVE-2026-41401 (GCVE-0-2026-41401)

Vulnerability from cvelistv5 – Published: 2026-05-26 14:08 – Updated: 2026-05-26 17:58

Title

libyang - Heap Use-After-Free Write in XML Metadata Parsing

Summary

libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries. Attackers can trigger this vulnerability by submitting crafted YANG XML documents with specific metadata attributes to applications parsing untrusted XML data, causing process crashes or potential code execution.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/CESNET/libyang/security/adviso…	vendor-advisory
https://github.com/CESNET/libyang/commit/6b5ed47e…	patch
https://red.anthropic.com/2026/cvd/findings/ANT-2…	third-party-advisory
https://www.vulncheck.com/advisories/libyang-heap…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
libyang	libyang	Affected: 0 , < 5.4.3 (custom) Unaffected: 5.4.3 (custom)

Date Public

2026-03-26 00:00

Credits

kevin-valerio

Show details on NVD website

JSON

To clipboard

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CVE-2026-44673 (GCVE-0-2026-44673)

Vulnerability from cvelistv5 – Published: 2026-05-14 20:35 – Updated: 2026-05-15 14:19

Title

libyang: lyb_read_string() integer overflow → heap buffer overflow

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/CESNET/libyang/security/adviso…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
CESNET	libyang	Affected: < SO 5.2.15

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

SUSE-SU-2026:2337-1

CVE-2026-41401 (GCVE-0-2026-41401)

CVE-2026-44673 (GCVE-0-2026-44673)

Tags

Sightings

Nomenclature