CVE-2023-31566Network attack vector

Denial of service via heap use-after-free

Published May 10, 2023 · Updated Jan 27, 2025

Heap-use-after-free in PoDoFo 0.10.0 allows remote attackers to cause service interruption by supplying a crafted PDF to PdfEncrypt processing. The PdfEncrypt::IsMetadataEncrypted() component accesses heap memory after it has been released while handling PDF encryption metadata. Exploitation requires a vulnerable application to process attacker-controlled PDF input and can crash or otherwise interrupt that application; broader code execution is not established by the available record.

CVSS severity8.8
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-use-after-free in PoDoFo 0.10.0 allows remote attackers to cause service interruption by supplying a crafted PDF to PdfEncrypt processing. The PdfEncrypt::IsMetadataEncrypted() component accesses heap memory after it has been released while handling PDF encryption metadata. Exploitation requires a vulnerable application to process attacker-controlled PDF input and can crash or otherwise interrupt that application; broader code execution is not established by the available record.

The record

CVE
CVE-2023-31566
Published
May 10, 2023
Updated
Jan 27, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 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

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

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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