CVE-2025-8176Public exploit

Local utility crash via freed color-cell read

Published Jul 26, 2025 · Updated Jul 28, 2025

Heap use-after-free in LibTIFF tiffmedian 4.7.0 allows local users to crash the utility by processing a malformed TIFF file. A scanline read failure leaves processing state inconsistent, after which quant_fsdither reads a color-cell allocation already freed by map_colortable. The demonstrated path requires local invocation with Floyd-Steinberg dithering and terminates with an AddressSanitizer-detected abort.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap use-after-free in LibTIFF tiffmedian 4.7.0 allows local users to crash the utility by processing a malformed TIFF file. A scanline read failure leaves processing state inconsistent, after which quant_fsdither reads a color-cell allocation already freed by map_colortable. The demonstrated path requires local invocation with Floyd-Steinberg dithering and terminates with an AddressSanitizer-detected abort.

The record

CVE
CVE-2025-8176
Published
Jul 26, 2025
Updated
Jul 28, 2025
Vendor
LibTIFF
Product
LibTIFF
Classifications
CWE-416, CWE-119, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=4.0
  2. Affected versionversion=4.1
  3. Affected versionversion=4.2
  4. Affected versionversion=4.3
  5. Affected versionversion=4.4
  6. Affected versionversion=4.5
  7. Affected versionversion=4.6
  8. Affected versionversion=4.7.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

LibTIFF · LibTIFFversion=4.0; version=4.1; version=4.2; version=4.3; version=4.4; version=4.5; version=4.6; version=4.7.0

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 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-416Use After Free
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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