CVE-2016-6288

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

The php_url_parse_ex function in ext/standard/url.c in PHP before 5.5.38 allows remote attackers to cause a denial of service (buffer over-read) or possibly have unspecified other impact via vectors involving the smart_str data type.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: 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
Severity98% × 45%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
91.4%
KEV
Not listed

Published

July 25, 2016

Last Modified

May 6, 2026

Advisory Details (6)

Auto-updated May 8, 2026
No patch confirmed yet.
generic

About the security content of macOS Sierra 10.12 - Apple Support

https://support.apple.com/HT207170
generic

PHP :: Bug #70480 :: php_url_parse_ex() buffer overflow read

https://bugs.php.net/70480
generic
http://www.securityfocus.com/bid/92111
generic
http://rhn.redhat.com/errata/RHSA-2016-2750.html
generic

PHP: PHP 5 ChangeLog

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

oss-security - Re: Fwd: CVE for PHP 5.5.38 issues

http://openwall.com/lists/oss-security/2016/07/24/2

Vendor Advisories for CVE-2016-6288(1)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp7.0-zip (7.0.8-0ubuntu0.16.04.2) @ xenial2026-05-20ubuntu
redhatrh-php56-php-pear-1:1.9.5-4.el72016-11-15redhat

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.

Additional Vendor Advisories

(1)

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 14× in last 7d / 41× 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. 2026-07-23 01:23 UTCEG score recompute
  2. 2026-07-22 22:03 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
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  25. 2026-07-08 08:57 UTCOSV refresh
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  1. 2026-07-07 13:42 UTCEPSS rescore
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  20. 2026-06-19 20:36 UTCOSV refresh
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  45. 2026-05-31 22:28 UTCEPSS rescore
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  47. 2026-05-31 00:50 UTCOSV refresh
  48. 2026-05-31 00:14 UTCEPSS rescore
  49. 2026-05-29 13:41 UTCEPSS rescore
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  62. 2026-05-20 09:57 UTCVendor advisory
  63. 2026-05-20 09:57 UTCGHSA enrichment
  64. 2026-05-20 05:46 UTCVendor advisory
  65. 2026-05-20 05:46 UTCGHSA enrichment
  66. 2026-05-20 01:35 UTCVendor advisory
  67. 2026-05-20 01:35 UTCGHSA enrichment
  68. 2026-05-19 21:24 UTCVendor advisory
  69. 2026-05-19 21:24 UTCGHSA enrichment
  70. 2026-05-19 17:13 UTCVendor advisory
  71. 2026-05-19 17:13 UTCGHSA enrichment
  72. 2026-05-19 13:02 UTCVendor advisory
  73. 2026-05-19 13:02 UTCGHSA enrichment
  74. 2026-05-19 08:51 UTCVendor advisory
  75. 2026-05-19 08:50 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2016-6288?
CVE-2016-6288 is a critical vulnerability published on July 25, 2016. The phpurlparseex function in ext/standard/url.c in PHP before 5.5.38 allows remote attackers to cause a denial of service (buffer over-read) or possibly have unspecified other impact via vectors involving the smartstr data type.
When was CVE-2016-6288 disclosed?
CVE-2016-6288 was first published in the National Vulnerability Database on July 25, 2016, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-6288 actively exploited?
CVE-2016-6288 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-6288?
CVE-2016-6288 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-6288?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-6288, 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.

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