CVE-2016-6296

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: 6%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

Integer signedness error in the simplestring_addn function in simplestring.c in xmlrpc-epi through 0.54.2, as used in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9, allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact via a long first argument to the PHP xmlrpc_encode_request function.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
92.7%
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
http://www.securityfocus.com/bid/92095
generic

[SECURITY] [DSA 3631-1] php5 security update

http://www.debian.org/security/2016/dsa-3631
generic
http://rhn.redhat.com/errata/RHSA-2016-2750.html
generic

PHP: PHP 7 ChangeLog

http://php.net/ChangeLog-7.php
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-2016-6296(1)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp7.0-zip (7.0.8-0ubuntu0.16.04.2) @ xenial2026-05-20ubuntu
ubuntulibxmlrpc-epi0 (0.54.2-1.1ubuntu0.1) @ 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

(2)

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 10× in last 7d / 38× 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.

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

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Frequently asked(5)

What is CVE-2016-6296?
CVE-2016-6296 is a critical vulnerability published on July 25, 2016. Integer signedness error in the simplestringaddn function in simplestring.c in xmlrpc-epi through 0.54.2, as used in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9, allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other…
When was CVE-2016-6296 disclosed?
CVE-2016-6296 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-2016-6296 actively exploited?
CVE-2016-6296 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-6296?
CVE-2016-6296 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-6296?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-6296, 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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