CVE-2020-35530Public exploit

Application crash via unchecked Huffman-tree node index

Published Sep 1, 2022 · Updated Aug 4, 2024

Out-of-bounds write in LibRaw 0.20-RC2 through 0.20.2 and 0.21-Beta1 allows context-dependent attackers to trigger a crash via a crafted X3F file. The new_node() helper indexes the Huffman-tree node array with free_node_index without verifying that it remains below the allocated node count. Processing the attacker-supplied file can therefore write beyond the heap allocation and terminate the host application; opening or converting the file is required.

CVSS severity5.5
Medium
EPSS probability0.39%
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 write in LibRaw 0.20-RC2 through 0.20.2 and 0.21-Beta1 allows context-dependent attackers to trigger a crash via a crafted X3F file. The new_node() helper indexes the Huffman-tree node array with free_node_index without verifying that it remains below the allocated node count. Processing the attacker-supplied file can therefore write beyond the heap allocation and terminate the host application; opening or converting the file is required.

The record

CVE
CVE-2020-35530
Published
Sep 1, 2022
Updated
Aug 4, 2024
Vendor
LibRaw LLC
Product
LibRaw
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=LibRaw 0.21-Beta1, LibRaw 0.20.2, LibRaw 0.20.1, LibRaw 0.20.0, LibRaw 0.20-RC2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

LibRaw LLC · LibRawversion=LibRaw 0.21-Beta1, LibRaw 0.20.2, LibRaw 0.20.1, LibRaw 0.20.0, LibRaw 0.20-RC2

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File

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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