CVE-2023-39615Public exploitNetwork attack vector

Application crash via legacy SAX1 callback handling

Published Aug 29, 2023 · Updated Nov 3, 2025

Out-of-bounds read in libxml2 2.11.0 allows attackers to crash an application when it parses a crafted XML file through SAX1. xmlSAX2StartElement in SAX2.c accesses memory outside the expected buffer while dispatching legacy SAX1 start-element callbacks. The claim requires unsupported custom callbacks on the legacy SAX1 interface, and the maintainer states that this configuration crashes without crafted input.

CVSS severity6.5
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in libxml2 2.11.0 allows attackers to crash an application when it parses a crafted XML file through SAX1. xmlSAX2StartElement in SAX2.c accesses memory outside the expected buffer while dispatching legacy SAX1 start-element callbacks. The claim requires unsupported custom callbacks on the legacy SAX1 interface, and the maintainer states that this configuration crashes without crafted input.

The record

CVE
CVE-2023-39615
Published
Aug 29, 2023
Updated
Nov 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1203Exploitation for Client Execution

Public exploit references

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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