CVE-2025-8836Public exploit

Transcoder crash via unchecked encoder option

Published Aug 11, 2025 · Updated Aug 12, 2025

Reachable assertion in the JasPer JPEG2000 encoder 4.2.0 through 4.2.5 allows local users to crash the transcoder via malformed options. The encoder converts an empty or invalid cblkwidth value to zero and passes it to jpc_floorlog2, violating its x > 0 assertion and raising SIGABRT. Exploitation requires local command execution and interrupts only the affected transcoder process; no confidentiality or integrity impact is reported.

CVSS severity3.3
Low
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the JasPer JPEG2000 encoder 4.2.0 through 4.2.5 allows local users to crash the transcoder via malformed options. The encoder converts an empty or invalid cblkwidth value to zero and passes it to jpc_floorlog2, violating its x > 0 assertion and raising SIGABRT. Exploitation requires local command execution and interrupts only the affected transcoder process; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2025-8836
Published
Aug 11, 2025
Updated
Aug 12, 2025
Vendor
JasPer Software
Product
JasPer
Classifications
CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2025Record 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=4.2.0
  2. Affected versionversion=4.2.1
  3. Affected versionversion=4.2.2
  4. Affected versionversion=4.2.3
  5. Affected versionversion=4.2.4
  6. Affected versionversion=4.2.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

JasPer Software · JasPerversion=4.2.0; version=4.2.1; version=4.2.2; version=4.2.3; version=4.2.4; version=4.2.5

Published CVSS scores

1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
3.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
1.7VulDBAV:L/AC:L/Au:S/C:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

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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