CVE-2021-26926

Information disclosure or crash via JP2 component mismatch

Published Feb 23, 2021 · Updated Aug 3, 2024

Out-of-bounds read in JasPer before 2.0.25 allows attackers to disclose memory or crash applications via crafted JP2 images. The jp2_decode routine continued decoding when JP2 headers reported inconsistent component counts or data types, issuing warnings instead of stopping and enabling reads beyond valid buffers. Processing a malicious image is required, so impact depends on an application or user opening attacker-supplied JP2 content; consequences are limited to memory disclosure or process crash.

CVSS severity7.1
High
EPSS probability1.20%
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 read in JasPer before 2.0.25 allows attackers to disclose memory or crash applications via crafted JP2 images. The jp2_decode routine continued decoding when JP2 headers reported inconsistent component counts or data types, issuing warnings instead of stopping and enabling reads beyond valid buffers. Processing a malicious image is required, so impact depends on an application or user opening attacker-supplied JP2 content; consequences are limited to memory disclosure or process crash.

The record

CVE
CVE-2021-26926
Published
Feb 23, 2021
Updated
Aug 3, 2024
Vendor
JasPer Software
Product
JasPer
Classifications
CWE-125, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=jasper 2.0.25

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

JasPer Software · JasPerversion=jasper 2.0.25

Published CVSS scores

7.1NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
5.8NVDAV:N/AC:M/Au:N/C:P/I:N/A:P

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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