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TI-2026-79264 Aliases CVE-2026-115327GHSA-x4q2-x59g-x339

Uninitialized pointer free in libyang NETCONF RPC parser

Priority MEDIUM 60CWE-824Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Deferred Red Hat: fix deferred

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-824 and the CVSS impact.

Summary

CESNET libyang through 6.4.13 frees an uninitialized pointer (CWE-824) in lydxml_env_netconf_rpc() while parsing NETCONF rpc action envelopes. A peer with a NETCONF session can send an action element containing non-whitespace text to crash servers such as netopeer2 or corrupt the heap.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

libyang through 6.4.13 contains an uninitialized pointer free vulnerability in lydxml_env_netconf_rpc() in src/parser_xml.c when parsing NETCONF rpc action envelopes. Peers with a NETCONF session can send an action element containing non-whitespace text via lyd_parse_op() to crash servers like netopeer2 or corrupt the heap.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00314 24th percentileScored 2026-11-07
Fix Deferred Red Hat: fix deferred

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CESNETlibyangup to 6.4.13—No fix listedCNA
  • libyang VendorCESNET Affected up to 6.4.13 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for libyang. Red Hat Enterprise Linux 10 and Red Hat Enterprise Linux 9 are affected, and Red Hat has no fix available for them.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Not affected: 1 product
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-22 Threatist record created from CVE-2026-115327
  2. 2026-10-22 Alias added: GHSA-x4q2-x59g-x339
  3. 2026-10-23 Affected versions changed · Red Hat
  4. 2026-10-23 CVSS score added · Red Hat
  5. 2026-10-23 Priority changed: MEDIUM → LOW
  6. 2026-10-29 CISA SSVC decision points changed
  7. 2026-10-29 Priority changed: LOW → MEDIUM

References

Patch 1

Other 5

  • TI-2026-32573 libyang: lyb_read_string() integer overflow → heap buffer overflow CVSS 3.1HIGH 7.5
  • TI-2023-11820 libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via… CVSS 3.1HIGH 7.5
  • TI-2019-13946 Stack-based buffer overflow in Red Hat libyang CVSS 3.1CRITICAL 9.8
  • TI-2019-13945 Stack-based buffer overflow in Red Hat libyang CVSS 3.1CRITICAL 9.8
  • TI-2019-11637 The proxystatistics module before 3.1.0 for SimpleSAMLphp allows SQL Injection in lib/Auth/Process/DatabaseCommand.php. CVSS 3.0CRITICAL 9.8
  • TI-2026-85169 Heap buffer overflow in CESNET ipfixcol2 TCP LZ4 decoder CVSS 4.0HIGH 8.7
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences