CVE-2026-42217Public exploitNetwork attack vector

Out-of-bounds read via unbounded variable-length integer shift

Published May 7, 2026 · Updated May 7, 2026

Integer overflow in affected OpenEXR 3.x releases allows remote attackers to trigger an out-of-bounds read through a crafted idmanifest attribute. ImfIDManifest.cpp's readVariableLengthInteger() advances a seven-bit shift without rejecting values of 64 or more, then passes the corrupted result to readStringList(). Affected releases are 3.0.0 through 3.2.8, 3.3.0 through 3.3.10, and 3.4.0 through 3.4.10; unauthenticated file processing is sufficient, and the resulting read depends on compiler optimization.

CVSS severity6.3
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

Integer overflow in affected OpenEXR 3.x releases allows remote attackers to trigger an out-of-bounds read through a crafted idmanifest attribute. ImfIDManifest.cpp's readVariableLengthInteger() advances a seven-bit shift without rejecting values of 64 or more, then passes the corrupted result to readStringList(). Affected releases are 3.0.0 through 3.2.8, 3.3.0 through 3.3.10, and 3.4.0 through 3.4.10; unauthenticated file processing is sufficient, and the resulting read depends on compiler optimization.

The record

CVE
CVE-2026-42217
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 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=>= 3.0.0, < 3.2.9
  2. Affected versionversion=>= 3.3.0, < 3.3.11
  3. Affected versionversion=>= 3.4.0, < 3.4.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=>= 3.0.0, < 3.2.9; version=>= 3.3.0, < 3.3.11; version=>= 3.4.0, < 3.4.11

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

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-190Integer Overflow or Wraparound

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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