CVE-2016-5766

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-14. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 7%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

Integer overflow in the _gd2GetHeader function in gd_gd2.c in the GD Graphics Library (aka libgd) before 2.2.3, as used in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8, allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via crafted chunk dimensions in an image.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: 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
Severity88% × 45%
Exploitation8% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
7%
EPSS %ILE
94%
KEV
Not listed

Published

August 7, 2016

Last Modified

June 17, 2026

Advisory Details (7)

Auto-updated May 10, 2026
No patch confirmed yet.
generic

oss-security - Re: CVE for PHP 5.5.37 issues

http://www.openwall.com/lists/oss-security/2016/06/23/4
generic

[SECURITY] [DSA 3619-1] libgd2 security update

http://www.debian.org/security/2016/dsa-3619
generic
http://rhn.redhat.com/errata/RHSA-2016-2750.html
generic
http://rhn.redhat.com/errata/RHSA-2016-2598.html
generic

PHP: PHP 7 ChangeLog

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

PHP: PHP 5 ChangeLog

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

Fixed #72339 Integer Overflow in _gd2GetHeader() resulting in heap ov… · php/php-src@7722455 · GitHub

http://github.com/php/php-src/commit/7722455726bec8c53458a32851d2a87982cf0eac?w=1

Vendor Advisories for CVE-2016-5766(1)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgd3 (2.1.1-4ubuntu0.16.04.2) @ xenial2026-05-22ubuntu
redhatgd-0:2.0.35-27.el7_92020-12-15redhat
redhatrh-php56-php-pear-1:1.9.5-4.el72016-11-15redhat
redhatphp-0:5.4.16-42.el72016-11-03redhat

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

(9 across 9 ecosystems)
Alpine:v3.2(1)
PackageVulnerable rangeFixed inDependents
gd2.0.35-r0 ... 2.1.1-r2 (17 versions)2.2.1-r2—
Alpine:v3.3(1)
PackageVulnerable rangeFixed inDependents
gd2.0.35-r0 ... 2.1.1-r2 (17 versions)2.2.1-r2—
Alpine:v3.4(1)
PackageVulnerable rangeFixed inDependents
gd2.0.35-r0 ... 2.2.1-r0 (16 versions)2.2.3-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libgd2—2.2.2-29-g3c2b605-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libgd2—2.2.2-29-g3c2b605-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libgd2—2.2.2-29-g3c2b605-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libgd2—2.2.2-29-g3c2b605-1—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
libgd22.0.36~rc1~dfsg-6.1, 2.0.36~rc1~dfsg-6.1+deb7u1, 2.0.36~rc1~dfsg-6.1+deb7u2, 2.0.36~rc1~dfsg-6.1+deb7u32.0.36~rc1~dfsg-6.1+deb7u4—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
libgd22.1.0-5, 2.1.0-5+deb8u1, 2.1.0-5+deb8u2, 2.1.0-5+deb8u32.1.0-5+deb8u4—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 27× 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 124 total refreshes for this CVE.

  1. 2026-08-21 23:44 UTCEPSS rescore
  2. 2026-08-19 16:59 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
  4. 2026-08-17 13:42 UTCEPSS rescore
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  8. 2026-08-14 10:29 UTCOSV refresh
  9. 2026-08-12 13:46 UTCEPSS rescore
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  22. 2026-07-29 20:37 UTCOSV refresh
  23. 2026-07-28 15:31 UTCEPSS rescore
  24. 2026-07-25 14:13 UTCEPSS rescore
  25. 2026-07-24 14:13 UTCEPSS rescore
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  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:23 UTCEG score recompute
  3. 2026-07-22 22:03 UTCEG score recompute
  4. 2026-07-22 14:04 UTCEPSS rescore
  5. 2026-07-21 15:21 UTCEPSS rescore
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  7. 2026-07-20 17:04 UTCEPSS rescore
  8. 2026-07-19 14:28 UTCEPSS rescore
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  14. 2026-07-16 16:59 UTCEPSS rescore
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  18. 2026-07-15 01:56 UTCEPSS rescore
  19. 2026-07-13 22:26 UTCEPSS rescore
  20. 2026-07-13 06:09 UTCEPSS rescore
  21. 2026-07-12 08:07 UTCOSV refresh
  22. 2026-07-12 05:43 UTCEPSS rescore
  23. 2026-07-12 05:43 UTCEPSS rescore
  24. 2026-07-11 08:24 UTCEPSS rescore
  25. 2026-07-09 19:06 UTCEPSS rescore
  26. 2026-07-08 15:10 UTCEPSS rescore
  27. 2026-07-07 13:42 UTCEPSS rescore
  28. 2026-07-06 16:24 UTCEPSS rescore
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  40. 2026-06-27 03:05 UTCEPSS rescore
  41. 2026-06-25 13:47 UTCEPSS rescore
  42. 2026-06-24 14:02 UTCEPSS rescore
  43. 2026-06-23 21:30 UTCEPSS rescore
  44. 2026-06-23 13:30 UTCOSV refresh
  45. 2026-06-22 14:23 UTCEPSS rescore
  46. 2026-06-21 01:57 UTCEPSS rescore
  47. 2026-06-21 01:57 UTCEPSS rescore
  48. 2026-06-19 19:23 UTCEPSS rescore
  49. 2026-06-19 19:23 UTCEPSS rescore
  50. 2026-06-18 17:50 UTCEPSS rescore
  51. 2026-06-18 17:50 UTCEPSS rescore
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  55. 2026-06-15 17:45 UTCEPSS rescore
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  60. 2026-06-12 23:09 UTCEPSS rescore
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  62. 2026-06-07 15:22 UTCEPSS rescore
  63. 2026-06-07 15:22 UTCEPSS rescore
  64. 2026-06-06 15:59 UTCOSV refresh
  65. 2026-06-06 13:45 UTCEPSS rescore
  66. 2026-06-06 13:45 UTCEPSS rescore
  67. 2026-06-05 22:44 UTCEPSS rescore
  68. 2026-06-05 06:08 UTCEPSS rescore
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  70. 2026-06-04 13:10 UTCEPSS rescore
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  72. 2026-06-02 20:10 UTCEPSS rescore
  73. 2026-06-01 13:49 UTCEPSS rescore
  74. 2026-06-01 13:49 UTCEPSS rescore
  75. 2026-05-31 22:28 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2016-5766?
CVE-2016-5766 is a high vulnerability published on August 7, 2016. Integer overflow in the gd2GetHeader function in gdgd2.c in the GD Graphics Library (aka libgd) before 2.2.3, as used in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8, allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly…
When was CVE-2016-5766 disclosed?
CVE-2016-5766 was first published in the National Vulnerability Database on August 7, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-5766 actively exploited?
CVE-2016-5766 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 6.0% of all scored CVEs.
What is the CVSS score of CVE-2016-5766?
CVE-2016-5766 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2016-5766?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-5766, 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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