CVE-2026-27631Public exploitNetwork attack vector

Process crash via overflowing PSD preview size

Published Mar 2, 2026 · Updated Mar 2, 2026

Uncaught exception in Exiv2 before 0.28.8 allows attackers to crash the utility by requesting a preview of a crafted PSD file. PsdImage::readResourceBlock fails to reject a native-preview size above LONG_MAX before casting that size to a long seek offset, so the overflow drives preview extraction into an oversized std::vector allocation. The path is reached only when preview output such as -pp is requested, and exploitation terminates the invoked Exiv2 process.

CVSS severity5.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception in Exiv2 before 0.28.8 allows attackers to crash the utility by requesting a preview of a crafted PSD file. PsdImage::readResourceBlock fails to reject a native-preview size above LONG_MAX before casting that size to a long seek offset, so the overflow drives preview extraction into an oversized std::vector allocation. The path is reached only when preview output such as -pp is requested, and exploitation terminates the invoked Exiv2 process.

The record

CVE
CVE-2026-27631
Published
Mar 2, 2026
Updated
Mar 2, 2026
Vendor
Exiv2
Product
Exiv2
Classifications
CWE-248
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 2, 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=< 0.28.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Exiv2 · Exiv2version=< 0.28.8

Published CVSS scores

2.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A: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-248Uncaught Exception

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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