CVE-2026-18309

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-20. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.8Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

GIMP APNG File Parsing Integer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GIMP. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of APNG files. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29401.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 20, 2026

Last Modified

September 2, 2026

Advisory Details (2)

Auto-updated Aug 20, 2026
No patch confirmed yet.

Vendor Advisories for CVE-2026-18309(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
gimp3.0.4-3 ... 3.2.4-3 (19 versions)
  • every version up to 3.2.6-1: fixed in 3.2.6-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 104× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 170 total refreshes for this CVE.

  1. 2026-10-05 05:01 UTCEG score recompute
  2. 2026-10-05 05:01 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 16:02 UTCGHSA enrichment
  5. 2026-10-04 04:22 UTCGHSA enrichment
  6. 2026-10-03 16:47 UTCEG score recompute
  7. 2026-10-03 16:47 UTCGHSA enrichment
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-02 21:00 UTCEG score recompute
  10. 2026-10-02 21:00 UTCGHSA enrichment
  11. 2026-10-02 09:12 UTCGHSA enrichment
  12. 2026-10-01 21:29 UTCEG score recompute
  13. 2026-10-01 21:29 UTCGHSA enrichment
  14. 2026-10-01 19:49 UTCEPSS rescore
  15. 2026-10-01 08:06 UTCGHSA enrichment
  16. 2026-09-30 20:31 UTCEG score recompute
  17. 2026-09-30 20:31 UTCGHSA enrichment
  18. 2026-09-30 15:02 UTCEPSS rescore
  19. 2026-09-30 08:15 UTCEG score recompute
  20. 2026-09-30 08:15 UTCGHSA enrichment
  21. 2026-09-29 15:20 UTCEPSS rescore
  22. 2026-09-29 02:51 UTCEG score recompute
  23. 2026-09-29 02:51 UTCGHSA enrichment
  24. 2026-09-28 15:16 UTCEG score recompute
  25. 2026-09-28 15:16 UTCGHSA enrichment
Show 75 more
  1. 2026-09-28 13:51 UTCEPSS rescore
  2. 2026-09-28 03:32 UTCGHSA enrichment
  3. 2026-09-27 15:58 UTCEG score recompute
  4. 2026-09-27 15:57 UTCGHSA enrichment
  5. 2026-09-27 13:47 UTCEPSS rescore
  6. 2026-09-27 03:04 UTCEG score recompute
  7. 2026-09-27 03:04 UTCGHSA enrichment
  8. 2026-09-26 15:58 UTCEPSS rescore
  9. 2026-09-25 06:51 UTCGHSA enrichment
  10. 2026-09-24 19:16 UTCEG score recompute
  11. 2026-09-24 19:16 UTCGHSA enrichment
  12. 2026-09-24 07:41 UTCGHSA enrichment
  13. 2026-09-23 20:05 UTCEG score recompute
  14. 2026-09-23 20:05 UTCGHSA enrichment
  15. 2026-09-23 07:20 UTCGHSA enrichment
  16. 2026-09-22 19:45 UTCEG score recompute
  17. 2026-09-22 19:45 UTCGHSA enrichment
  18. 2026-09-22 08:06 UTCEG score recompute
  19. 2026-09-22 08:06 UTCGHSA enrichment
  20. 2026-09-21 20:31 UTCGHSA enrichment
  21. 2026-09-21 08:56 UTCGHSA enrichment
  22. 2026-09-20 20:58 UTCEG score recompute
  23. 2026-09-20 20:58 UTCGHSA enrichment
  24. 2026-09-20 09:23 UTCGHSA enrichment
  25. 2026-09-19 21:47 UTCEG score recompute
  26. 2026-09-19 21:47 UTCGHSA enrichment
  27. 2026-09-19 10:12 UTCGHSA enrichment
  28. 2026-09-18 21:39 UTCEG score recompute
  29. 2026-09-18 21:39 UTCGHSA enrichment
  30. 2026-09-18 19:27 UTCEPSS rescore
  31. 2026-09-18 08:58 UTCGHSA enrichment
  32. 2026-09-17 21:23 UTCEG score recompute
  33. 2026-09-17 21:23 UTCGHSA enrichment
  34. 2026-09-17 09:18 UTCGHSA enrichment
  35. 2026-09-16 21:43 UTCEG score recompute
  36. 2026-09-16 21:43 UTCGHSA enrichment
  37. 2026-09-16 14:07 UTCEPSS rescore
  38. 2026-09-16 09:42 UTCEG score recompute
  39. 2026-09-16 09:42 UTCGHSA enrichment
  40. 2026-09-16 05:14 UTCEPSS rescore
  41. 2026-09-15 21:25 UTCGHSA enrichment
  42. 2026-09-15 09:50 UTCEG score recompute
  43. 2026-09-15 09:50 UTCGHSA enrichment
  44. 2026-09-14 22:15 UTCGHSA enrichment
  45. 2026-09-14 10:28 UTCGHSA enrichment
  46. 2026-09-13 22:53 UTCEG score recompute
  47. 2026-09-13 22:53 UTCGHSA enrichment
  48. 2026-09-13 16:46 UTCEPSS rescore
  49. 2026-09-13 11:18 UTCGHSA enrichment
  50. 2026-09-12 23:43 UTCEG score recompute
  51. 2026-09-12 23:43 UTCGHSA enrichment
  52. 2026-09-12 15:00 UTCEPSS rescore
  53. 2026-09-12 12:08 UTCGHSA enrichment
  54. 2026-09-12 00:33 UTCEG score recompute
  55. 2026-09-12 00:33 UTCGHSA enrichment
  56. 2026-09-11 14:52 UTCEPSS rescore
  57. 2026-09-11 12:58 UTCEG score recompute
  58. 2026-09-11 12:58 UTCGHSA enrichment
  59. 2026-09-11 09:36 UTCEPSS rescore
  60. 2026-09-11 01:09 UTCGHSA enrichment
  61. 2026-09-10 13:34 UTCEG score recompute
  62. 2026-09-10 13:34 UTCGHSA enrichment
  63. 2026-09-10 09:34 UTCEPSS rescore
  64. 2026-09-10 01:59 UTCGHSA enrichment
  65. 2026-09-09 14:24 UTCGHSA enrichment
  66. 2026-09-09 01:57 UTCEG score recompute
  67. 2026-09-09 01:57 UTCGHSA enrichment
  68. 2026-09-08 22:00 UTCEPSS rescore
  69. 2026-09-08 03:08 UTCEG score recompute
  70. 2026-09-08 03:08 UTCGHSA enrichment
  71. 2026-09-07 16:01 UTCEPSS rescore
  72. 2026-09-07 15:33 UTCGHSA enrichment
  73. 2026-09-07 03:25 UTCGHSA enrichment
  74. 2026-09-06 15:47 UTCEG score recompute
  75. 2026-09-06 15:47 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-18309?
CVE-2026-18309 is a high vulnerability published on August 20, 2026. GIMP APNG File Parsing Integer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GIMP. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a…
When was CVE-2026-18309 disclosed?
CVE-2026-18309 was first published on August 20, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18309 actively exploited?
CVE-2026-18309 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18309?
CVE-2026-18309 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18309?
No fix for CVE-2026-18309 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18309 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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