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: 7.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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
8.8HIGHmedium confidence
EG Risk
47
EG Risk 47/100CISA 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
Severity88% × 45%
Exploitation8% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
7.5%
EPSS %ILE
94th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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 7, 2016

Last Modified

June 17, 2026

Advisory Details (7)

Auto-updated May 10, 2026
Patch available.
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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
gd—
  • every version up to 2.2.1-r2: fixed in 2.2.1-r2
—
Alpine:v3.3(1)
PackageVulnerable rangeFix by version rangeDependents
gd—
  • every version up to 2.2.1-r2: fixed in 2.2.1-r2
—
Alpine:v3.4(1)
PackageVulnerable rangeFix by version rangeDependents
gd—
  • every version up to 2.2.3-r0: fixed in 2.2.3-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libgd2—
  • every version up to 2.2.2-29-g3c2b605-1: fixed in 2.2.2-29-g3c2b605-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libgd2—
  • every version up to 2.2.2-29-g3c2b605-1: fixed in 2.2.2-29-g3c2b605-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libgd2—
  • every version up to 2.2.2-29-g3c2b605-1: fixed in 2.2.2-29-g3c2b605-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libgd2—
  • every version up to 2.2.2-29-g3c2b605-1: fixed in 2.2.2-29-g3c2b605-1
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
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+deb7u3
  • every version up to 2.0.36~rc1~dfsg-6.1+deb7u4: fixed in 2.0.36~rc1~dfsg-6.1+deb7u4
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
libgd22.1.0-5, 2.1.0-5+deb8u1, 2.1.0-5+deb8u2, 2.1.0-5+deb8u3
  • every version up to 2.1.0-5+deb8u4: fixed in 2.1.0-5+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 5× in last 7d / 22× 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 155 total refreshes for this CVE.

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

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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 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 7.5% probability of exploitation in the next 30 days (94th percentile of EPSS-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?
A fix for CVE-2016-5766 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2016-5766 are linked in the Vendor Advisories panel on this page.

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