CVE-2026-77118

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (5th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pcd.c), the Huffman delta loop advances its output pointer with q++ after every decoded delta and never checks it against the end of the heap-allocated luma/chroma plane buffers. The pointer is repositioned only when a sync marker introduces a new plane/row; between sync markers the run length is bounded solely by the input.

A crafted PCD file that positions the pointer near the end of a plane and then supplies a long run of deltas with no intervening sync therefore walks the pointer past the end of the allocation and writes through it. Processing an untrusted PCD file — for example with gm convert or gm identify, or through any application linked against libGraphicsMagick — can corrupt heap memory beyond the buffers.

CVSS v3
8.4
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA 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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

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 9, 2026

Advisory Details (2)

Auto-updated Aug 20, 2026
Patch available.
generic
https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/raw/GraphicsMagick-1_3_48/ChangeLog
generic

coders/pcd.c (ReadPCDImage): Over-provision the per-channel Huffman decode... (937cdd9920bd) · Commits · GraphicsMagick / graphicsmagick · GitLab

https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/commit/937cdd9920bd96

Vendor Advisories for CVE-2026-77118(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
graphicsmagick1.4+really1.3.40-4 ... 1.4+really1.3.48-1 (15 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
graphicsmagick1.4+really1.3.45+hg17696-1, 1.4+really1.3.46-1, 1.4+really1.3.46-2, 1.4+really1.3.48-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
graphicsmagick1.4+really1.3.45+hg17696-1, 1.4+really1.3.46-1, 1.4+really1.3.46-2
  • every version up to 1.4+really1.3.48-1: fixed in 1.4+really1.3.48-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 106× 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 172 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-77118?
CVE-2026-77118 is a high vulnerability published on August 20, 2026. A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pcd.c), the Huffman delta loop advances its output pointer with q++ after every decoded delta and never checks it against the end of the heap-allocated luma/chroma plane buffers. The pointer…
When was CVE-2026-77118 disclosed?
CVE-2026-77118 was first published on August 20, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77118 actively exploited?
CVE-2026-77118 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77118?
CVE-2026-77118 has a CVSS base score of 8.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77118?
A fix for CVE-2026-77118 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77118 are linked in the Vendor Advisories panel on this page.

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