CVE-2026-27622Public exploit

Heap overwrite via wrapped deep-sample totals

Published Mar 3, 2026 · Updated Mar 3, 2026

Out-of-bounds write in affected OpenEXR releases allows attackers to corrupt heap memory via a crafted multipart deep EXR file. CompositeDeepScanLine::readPixels accumulates attacker-controlled per-pixel sample totals in 32-bit unsigned entries, then sizes a composite sample buffer from wrapped totals while the decoder writes the true sample volume. A user or image-processing workflow must open the file; affected ranges are 2.3.0 through 3.2.5, 3.3.0 through 3.3.7, and 3.4.0 through 3.4.5, and successful exploitation causes a crash or code execution.

CVSS severity8.4
High
EPSS probability0.20%
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 affected OpenEXR releases allows attackers to corrupt heap memory via a crafted multipart deep EXR file. CompositeDeepScanLine::readPixels accumulates attacker-controlled per-pixel sample totals in 32-bit unsigned entries, then sizes a composite sample buffer from wrapped totals while the decoder writes the true sample volume. A user or image-processing workflow must open the file; affected ranges are 2.3.0 through 3.2.5, 3.3.0 through 3.3.7, and 3.4.0 through 3.4.5, and successful exploitation causes a crash or code execution.

The record

CVE
CVE-2026-27622
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-122, CWE-190, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 2.3.0, < 3.2.6
  2. Affected versionversion=>= 3.3.0, < 3.3.8
  3. Affected versionversion=>= 3.4.0, < 3.4.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=>= 2.3.0, < 3.2.6; version=>= 3.3.0, < 3.3.8; version=>= 3.4.0, < 3.4.6

Published CVSS scores

7.4Red Hat Security DataCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8NIST NVDCVSS:3.1/AV:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-122Heap-based Buffer Overflow
CWE-190Integer Overflow or Wraparound
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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