CVE-2026-6694: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Red Hat Red Hat Enterprise Linux 6
A stack-based buffer overflow vulnerability exists in the GIMP file-png plugin when processing specially crafted Animated Portable Network Graphics (APNG) images containing an oversized tRNS chunk. Exploitation can cause the plugin to crash, resulting in a denial of service (DoS). The main GIMP application remains unaffected as plugins run in separate processes. No patch or official fix status is currently confirmed by Red Hat. Mitigation involves avoiding opening or processing untrusted APNG files with GIMP.
AI Analysis
Technical Summary
CVE-2026-6694 is a medium severity vulnerability affecting the GIMP file-png plugin included in Red Hat Enterprise Linux 6. The flaw is a classic stack-based buffer overflow triggered by an oversized tRNS chunk in a malicious APNG image. This causes the file-png plugin to crash, leading to denial of service. The main GIMP application is not impacted due to plugin process isolation. Red Hat's advisory does not confirm an available patch or fix. The vulnerability requires local attack vector with user interaction and low attack complexity. The CVSS v3.1 score is 5.5 with impact limited to availability.
Potential Impact
Successful exploitation causes the file-png plugin to crash, resulting in denial of service for the user. The main GIMP application remains unaffected because plugins execute in separate processes. There is no impact on confidentiality or integrity. No known exploits are reported in the wild. The vulnerability requires local access and user interaction to trigger.
Mitigation Recommendations
Red Hat's advisory recommends avoiding opening or processing untrusted APNG image files with GIMP to prevent triggering the vulnerability. Since the vulnerability is caused by malformed APNG content, restricting interaction with such files effectively mitigates the risk. If the plugin crashes, restarting GIMP restores functionality. Patch status is not confirmed; check the Red Hat advisory for updates.
CVE-2026-6694: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Red Hat Red Hat Enterprise Linux 6
Description
A stack-based buffer overflow vulnerability exists in the GIMP file-png plugin when processing specially crafted Animated Portable Network Graphics (APNG) images containing an oversized tRNS chunk. Exploitation can cause the plugin to crash, resulting in a denial of service (DoS). The main GIMP application remains unaffected as plugins run in separate processes. No patch or official fix status is currently confirmed by Red Hat. Mitigation involves avoiding opening or processing untrusted APNG files with GIMP.
CVSS v3.1
Score 5.5medium
Affected software
Red Hat
Red Hat Enterprise Linux 6
Red Hat
Red Hat Enterprise Linux 7
Red Hat
Red Hat Enterprise Linux 8
Red Hat
Red Hat Enterprise Linux 9
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6694 is a medium severity vulnerability affecting the GIMP file-png plugin included in Red Hat Enterprise Linux 6. The flaw is a classic stack-based buffer overflow triggered by an oversized tRNS chunk in a malicious APNG image. This causes the file-png plugin to crash, leading to denial of service. The main GIMP application is not impacted due to plugin process isolation. Red Hat's advisory does not confirm an available patch or fix. The vulnerability requires local attack vector with user interaction and low attack complexity. The CVSS v3.1 score is 5.5 with impact limited to availability.
Potential Impact
Successful exploitation causes the file-png plugin to crash, resulting in denial of service for the user. The main GIMP application remains unaffected because plugins execute in separate processes. There is no impact on confidentiality or integrity. No known exploits are reported in the wild. The vulnerability requires local access and user interaction to trigger.
Mitigation Recommendations
Red Hat's advisory recommends avoiding opening or processing untrusted APNG image files with GIMP to prevent triggering the vulnerability. Since the vulnerability is caused by malformed APNG content, restricting interaction with such files effectively mitigates the risk. If the plugin crashes, restarting GIMP restores functionality. Patch status is not confirmed; check the Red Hat advisory for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-04-20T16:43:07.025Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-6694","vendor":"Red Hat"}]
Threat ID: 6a70282abf32cb7a3405a171
Added to database: 08/03/2026, 05:33:30 UTC
Last enriched: 08/10/2026, 15:17:12 UTC
Last updated: 09/17/2026, 22:01:37 UTC
Views: 53
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