CVE-2019-6977

HIGHNVD 8.88.9▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.9 because EPSS predicts 64% probability of exploitation within the next 30 days (top 0.8% of all CVEs). NVD baseline CVSS 8.8 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Elevated
8.9EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 71%
CISA-KEV: Not listedEPSS PROB: 71%CVSS: 8.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

gdImageColorMatch in gd_color_match.c in the GD Graphics Library (aka LibGD) 2.2.5, as used in the imagecolormatch function in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1, has a heap-based buffer overflow. This can be exploited by an attacker who is able to trigger imagecolormatch calls with crafted image data.

CVSS v3
8.8
EG Score
8.9(high)
EG Risk
70(Track)
EG Risk 70/100SSVC: Track

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
Severity89% × 45%
Exploitation64% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
71%
EPSS %ILE
99%
KEV
Not listed

Published

January 27, 2019

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Aug 19, 2026
Patch available. Sources: redhat.
generic Patch Available

[SECURITY] [DLA 1651-1] libgd2 security update

https://lists.debian.org/debian-lts-announce/2019/01/msg00028.html
generic

PHP :: Sec Bug #77270 :: imagecolormatch Out Of Bounds Write on Heap

https://bugs.php.net/bug.php?id=77270
redhat Patch Available
https://access.redhat.com/errata/RHSA-2019:3299
redhat Patch Available
https://access.redhat.com/errata/RHSA-2019:2519
generic

CVE-2019-6977 - PSIRT.COM

http://www.securityfocus.com/bid/106731
generic

PHP: PHP 7 ChangeLog

http://php.net/ChangeLog-7.php
generic

PHP: PHP 5 ChangeLog

http://php.net/ChangeLog-5.php
generic

Locked Out | Packet Storm

http://packetstormsecurity.com/files/152459/PHP-7.2-imagecolormatch-Out-Of-Band-Heap-Write.html

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgd3 (2.1.1-4ubuntu0.16.04.11) @ xenial2026-05-27ubuntu
redhatgd-0:2.2.5-7.el82020-11-04redhat
redhatrh-php72-php-0:7.2.24-1.el72019-11-01redhat
redhatrh-php71-php-0:7.1.30-1.el72019-08-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(26 across 25 ecosystems)
Debian:8(2)
PackageVulnerable rangeFixed inDependents
libgd22.1.0-5 ... 2.1.0-5+deb8u9 (12 versions)2.1.0-5+deb8u12—
php55.6.11+dfsg-1 ... 5.6.9+dfsg-1 (46 versions)5.6.40+dfsg-0+deb8u1—
Alpine:v3.10(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.11(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.12(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.13(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.14(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.6(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.7(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.8(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Alpine:v3.9(1)
PackageVulnerable rangeFixed inDependents
gd—2.2.5-r2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libgd2—2.2.5-5.1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libgd2—2.2.5-5.1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libgd2—2.2.5-5.1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libgd2—2.2.5-5.1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
libgd22.2.4-2, 2.2.4-2+deb9u1, 2.2.4-2+deb9u2, 2.2.4-2+deb9u32.2.4-2+deb9u4—

Weakness Classification(1)

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

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 4× in last 7d / 17× 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 108 total refreshes for this CVE.

  1. 2026-09-24 13:59 UTCEPSS rescore
  2. 2026-09-22 14:43 UTCEPSS rescore
  3. 2026-09-21 20:28 UTCEPSS rescore
  4. 2026-09-18 19:23 UTCEPSS rescore
  5. 2026-09-16 14:04 UTCEPSS rescore
  6. 2026-09-15 03:06 UTCEPSS rescore
  7. 2026-09-12 14:56 UTCEPSS rescore
  8. 2026-09-11 14:48 UTCEPSS rescore
  9. 2026-09-08 21:55 UTCEPSS rescore
  10. 2026-09-08 18:34 UTCOSV refresh
  11. 2026-09-06 13:44 UTCEPSS rescore
  12. 2026-09-05 15:24 UTCEPSS rescore
  13. 2026-09-04 13:56 UTCEPSS rescore
  14. 2026-09-01 03:32 UTCEPSS rescore
  15. 2026-08-30 01:18 UTCEPSS rescore
  16. 2026-08-27 14:21 UTCEPSS rescore
  17. 2026-08-26 14:42 UTCEPSS rescore
  18. 2026-08-22 03:07 UTCOSV refresh
  19. 2026-08-19 17:00 UTCEPSS rescore
  20. 2026-08-15 01:26 UTCEPSS rescore
  21. 2026-08-13 21:57 UTCEPSS rescore
  22. 2026-08-12 13:47 UTCEPSS rescore
  23. 2026-08-08 16:33 UTCEPSS rescore
  24. 2026-08-07 16:23 UTCEPSS rescore
  25. 2026-08-06 06:54 UTCOSV refresh
Show 75 more
  1. 2026-08-05 19:13 UTCEPSS rescore
  2. 2026-08-04 10:34 UTCEPSS rescore
  3. 2026-08-03 10:32 UTCEPSS rescore
  4. 2026-08-01 04:12 UTCEPSS rescore
  5. 2026-07-30 16:24 UTCEPSS rescore
  6. 2026-07-30 01:27 UTCEPSS rescore
  7. 2026-07-28 15:32 UTCEPSS rescore
  8. 2026-07-26 14:51 UTCEPSS rescore
  9. 2026-07-25 14:14 UTCEPSS rescore
  10. 2026-07-24 14:14 UTCEPSS rescore
  11. 2026-07-23 14:15 UTCEPSS rescore
  12. 2026-07-23 01:46 UTCEG score recompute▲ 0.10
  13. 2026-07-22 22:28 UTCEG score recompute▼ 0.20
  14. 2026-07-22 14:05 UTCEPSS rescore
  15. 2026-07-20 23:32 UTCOSV refresh
  16. 2026-07-20 17:04 UTCEPSS rescore
  17. 2026-07-19 14:28 UTCEPSS rescore
  18. 2026-07-19 14:28 UTCEPSS rescore
  19. 2026-07-16 16:59 UTCEPSS rescore
  20. 2026-07-16 16:59 UTCEPSS rescore
  21. 2026-07-15 16:55 UTCEPSS rescore
  22. 2026-07-13 22:27 UTCEPSS rescore
  23. 2026-07-13 22:27 UTCEPSS rescore
  24. 2026-07-13 06:10 UTCEPSS rescore
  25. 2026-07-13 06:10 UTCEPSS rescore
  26. 2026-07-12 05:44 UTCEPSS rescore
  27. 2026-07-12 05:43 UTCEPSS rescore
  28. 2026-07-11 08:24 UTCEPSS rescore
  29. 2026-07-11 08:24 UTCEPSS rescore
  30. 2026-07-09 19:06 UTCEPSS rescore
  31. 2026-07-06 16:25 UTCEPSS rescore
  32. 2026-07-06 16:25 UTCEPSS rescore
  33. 2026-07-04 06:28 UTCEPSS rescore
  34. 2026-07-03 18:56 UTCOSV refresh
  35. 2026-07-01 15:03 UTCEPSS rescore
  36. 2026-07-01 15:03 UTCEPSS rescore
  37. 2026-06-30 23:20 UTCEPSS rescore
  38. 2026-06-29 14:03 UTCEPSS rescore
  39. 2026-06-28 14:04 UTCEPSS rescore
  40. 2026-06-27 03:06 UTCEPSS rescore
  41. 2026-06-25 13:47 UTCEPSS rescore
  42. 2026-06-25 13:47 UTCEPSS rescore
  43. 2026-06-24 14:03 UTCEPSS rescore
  44. 2026-06-24 14:03 UTCEPSS rescore
  45. 2026-06-23 21:31 UTCEPSS rescore
  46. 2026-06-23 21:31 UTCEPSS rescore
  47. 2026-06-21 01:57 UTCEPSS rescore
  48. 2026-06-21 01:57 UTCEPSS rescore
  49. 2026-06-18 17:50 UTCEPSS rescore
  50. 2026-06-18 17:50 UTCEPSS rescore
  51. 2026-06-17 17:50 UTCEPSS rescore
  52. 2026-06-16 17:50 UTCEPSS rescore
  53. 2026-06-15 17:46 UTCEPSS rescore
  54. 2026-06-15 06:43 UTCOSV refresh
  55. 2026-06-14 23:15 UTCEPSS rescore
  56. 2026-06-14 23:15 UTCEPSS rescore
  57. 2026-06-13 22:58 UTCEPSS rescore
  58. 2026-06-12 23:09 UTCEPSS rescore
  59. 2026-06-12 23:09 UTCEPSS rescore
  60. 2026-06-11 13:58 UTCEPSS rescore
  61. 2026-06-10 22:16 UTCEPSS rescore
  62. 2026-06-10 22:16 UTCEPSS rescore
  63. 2026-06-10 13:19 UTCEPSS rescore
  64. 2026-06-08 14:15 UTCEPSS rescore
  65. 2026-06-08 14:15 UTCEPSS rescore
  66. 2026-06-08 14:15 UTCEPSS rescore
  67. 2026-06-07 15:23 UTCEPSS rescore
  68. 2026-06-07 15:23 UTCEPSS rescore
  69. 2026-06-04 13:10 UTCEPSS rescore
  70. 2026-06-04 13:10 UTCEPSS rescore
  71. 2026-05-31 22:29 UTCEPSS rescore
  72. 2026-05-31 22:29 UTCEPSS rescore
  73. 2026-05-29 13:42 UTCEPSS rescore
  74. 2026-05-28 13:43 UTCEPSS rescore
  75. 2026-05-28 13:43 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-46677
    First seen Feb 27, 2019

    PHP 7.2 - 'imagecolormatch()' Out of Band Heap Write

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2019-6977?
CVE-2019-6977 is a high vulnerability published on January 27, 2019. gdImageColorMatch in gdcolormatch.c in the GD Graphics Library (aka LibGD) 2.2.5, as used in the imagecolormatch function in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1, has a heap-based buffer overflow. This can be exploited by an attacker who is able to…
When was CVE-2019-6977 disclosed?
CVE-2019-6977 was first published in the National Vulnerability Database on January 27, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-6977 actively exploited?
CVE-2019-6977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71% probability of exploitation in the next 30 days, which ranks it in the top 0.6% of all scored CVEs.
What is the CVSS score of CVE-2019-6977?
CVE-2019-6977 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.9.
How do I remediate CVE-2019-6977?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-6977, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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