CVE-2026-21413Public exploitNetwork attack vector

Code execution via unchecked CR2Slice column index

Published Apr 7, 2026 · Updated Apr 7, 2026

Heap-based buffer overflow in LibRaw Commit 0b56545 and Commit d20315b allows attackers to execute code via a crafted CR2 file. LibRaw::lossless_jpeg_load_raw derives col from attacker-controlled CR2Slice metadata but validates only row before using col to write into raw_image. Any application that calls unpack() on an untrusted CR2 file reaches the controlled out-of-bounds write, causing heap corruption and code execution.

CVSS severity9.8
Critical
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in LibRaw Commit 0b56545 and Commit d20315b allows attackers to execute code via a crafted CR2 file. LibRaw::lossless_jpeg_load_raw derives col from attacker-controlled CR2Slice metadata but validates only row before using col to write into raw_image. Any application that calls unpack() on an untrusted CR2 file reaches the controlled out-of-bounds write, causing heap corruption and code execution.

The record

CVE
CVE-2026-21413
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
LibRaw LLC
Product
LibRaw
Classifications
CWE-787, CWE-129, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record 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=Commit 0b56545
  2. Affected versionversion=Commit d20315b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LibRaw LLC · LibRawversion=Commit 0b56545; version=Commit d20315b

Published CVSS scores

9.8Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5Red HatCVSS:3.1/AV:N/AC:H/PR:L/UI:N/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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-129Improper Validation of Array Index
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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