CVE-2023-26916Network attack vector

Parser crash via NULL module revision comparison

Published Apr 3, 2023 · Updated Feb 18, 2025

NULL pointer dereference in CESNET libyang 2.0.164 through 2.1.30 allows remote attackers to crash a parsing process via crafted schema input. The lys_implement function passes a NULL module revision to strcmp while implementing a parsed module that omits its revision. Exploitation requires a libyang-based consumer to pass attacker-controlled schema text to lys_parse_mem and interrupts only that parsing process.

CVSS severity5.3
Medium
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in CESNET libyang 2.0.164 through 2.1.30 allows remote attackers to crash a parsing process via crafted schema input. The lys_implement function passes a NULL module revision to strcmp while implementing a parsed module that omits its revision. Exploitation requires a libyang-based consumer to pass attacker-controlled schema text to lys_parse_mem and interrupts only that parsing process.

The record

CVE
CVE-2023-26916
Published
Apr 3, 2023
Updated
Feb 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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