CVE-2016-9840

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

inftrees.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
91.0%
KEV
Not listed

Published

May 23, 2017

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 14, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 6 Supplementary and Red Hat Enterprise Linux 7 Supplementary.

https://access.redhat.com/errata/RHSA-2017:1221
redhat Patch Available

Affected: Red Hat Enterprise Linux 6 Supplementary and Red Hat Enterprise Linux 7 Supplementary.

https://access.redhat.com/errata/RHSA-2017:1220
generic
http://www.securitytracker.com/id/1039427
generic
http://www.securityfocus.com/bid/95131
generic

oss-security - Re: CVE Request: zlib security issues found during audit

http://www.openwall.com/lists/oss-security/2016/12/05/21

Vendor Advisories for CVE-2016-9840(16)

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

Patch Availability(19)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuzlib1g-udeb (1:1.2.8.dfsg-2ubuntu4.3) @ xenial2026-05-22ubuntu
ubuntursync (3.1.1-3ubuntu1.3) @ xenial2026-05-22ubuntu
ubuntulibklibc-dev (2.0.10-4ubuntu0.1) @ jammy2026-05-22ubuntu
ubuntulibklibc-dev (2.0.13-4ubuntu0.1) @ noble2026-05-22ubuntu
redhatrsync-0:3.1.3-20.el8_8.32025-08-18redhat
redhatrsync-0:3.1.3-14.el8_6.82025-07-29redhat
redhatrsync-0:3.1.3-7.el8_2.52025-07-15redhat
redhatrsync-0:3.1.3-12.el8_4.52025-07-08redhat
redhatrhcos-417.94.202505250306-02025-06-04redhat
redhatrhcos-418.94.202505271651-02025-06-03redhat
redhatrsync-0:3.1.3-23.el8_102025-06-02redhat
redhatzlib-0:1.2.7-21.el7_9.12025-05-29redhat
redhatjava-1.8.0-ibm-1:1.8.0.5.5-1jpp.1.el6_92017-12-13redhat
redhatjava-1.7.0-oracle-1:1.7.0.161-1jpp.4.el72017-10-24redhat
redhatjava-1.6.0-sun-1:1.6.0.171-1jpp.4.el72017-10-24redhat
redhatjava-1.8.0-oracle-1:1.8.0.151-1jpp.5.el72017-10-23redhat
redhatjava-1.6.0-ibm-1:1.6.0.16.45-1jpp.1.el6_92017-05-10redhat
redhatjava-1.7.1-ibm-1:1.7.1.4.5-1jpp.1.el7_32017-05-10redhat
redhatjava-1.8.0-ibm-1:1.8.0.4.5-1jpp.1.el7_32017-05-10redhat

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

(5)

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 / 45× 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. 2026-07-23 01:24 UTCEG score recompute
  2. 2026-07-22 22:04 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-21 15:21 UTCEPSS rescore
  5. 2026-07-21 15:21 UTCEPSS rescore
  6. 2026-07-20 17:04 UTCEPSS rescore
  7. 2026-07-19 14:28 UTCEPSS rescore
  8. 2026-07-19 14:28 UTCEPSS rescore
  9. 2026-07-19 02:26 UTCEPSS rescore
  10. 2026-07-19 02:26 UTCEPSS rescore
  11. 2026-07-18 10:00 UTCEPSS rescore
  12. 2026-07-18 10:00 UTCEPSS rescore
  13. 2026-07-16 16:59 UTCEPSS rescore
  14. 2026-07-16 16:59 UTCEPSS rescore
  15. 2026-07-15 16:54 UTCEPSS rescore
  16. 2026-07-15 16:54 UTCEPSS rescore
  17. 2026-07-15 01:56 UTCEPSS rescore
  18. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  19. 2026-07-14 12:10 UTCMITRE cvelistV5
  20. 2026-07-13 22:26 UTCEPSS rescore
  21. 2026-07-13 06:09 UTCEPSS rescore
  22. 2026-07-12 05:43 UTCEPSS rescore
  23. 2026-07-12 05:43 UTCEPSS rescore
  24. 2026-07-11 22:41 UTCOSV refresh
  25. 2026-07-11 08:24 UTCEPSS rescore
Show 72 more
  1. 2026-07-09 19:06 UTCEPSS rescore
  2. 2026-07-08 15:10 UTCEPSS rescore
  3. 2026-07-07 13:42 UTCEPSS rescore
  4. 2026-07-06 16:24 UTCEPSS rescore
  5. 2026-07-06 16:24 UTCEPSS rescore
  6. 2026-07-06 02:20 UTCEPSS rescore
  7. 2026-07-06 02:20 UTCEPSS rescore
  8. 2026-07-05 02:27 UTCEPSS rescore
  9. 2026-07-04 06:28 UTCEPSS rescore
  10. 2026-07-01 15:02 UTCEPSS rescore
  11. 2026-06-30 23:19 UTCEPSS rescore
  12. 2026-06-30 23:19 UTCEPSS rescore
  13. 2026-06-29 14:03 UTCEPSS rescore
  14. 2026-06-28 14:04 UTCEPSS rescore
  15. 2026-06-28 04:53 UTCEPSS rescore
  16. 2026-06-27 03:05 UTCEPSS rescore
  17. 2026-06-25 13:47 UTCEPSS rescore
  18. 2026-06-24 14:02 UTCEPSS rescore
  19. 2026-06-23 21:30 UTCEPSS rescore
  20. 2026-06-23 05:00 UTCOSV refresh
  21. 2026-06-21 14:54 UTCEPSS rescore
  22. 2026-06-21 14:54 UTCEPSS rescore
  23. 2026-06-21 01:57 UTCEPSS rescore
  24. 2026-06-21 01:57 UTCEPSS rescore
  25. 2026-06-19 19:23 UTCEPSS rescore
  26. 2026-06-19 19:23 UTCEPSS rescore
  27. 2026-06-18 17:50 UTCEPSS rescore
  28. 2026-06-18 17:50 UTCEPSS rescore
  29. 2026-06-17 17:50 UTCEPSS rescore
  30. 2026-06-17 17:50 UTCEPSS rescore
  31. 2026-06-16 17:50 UTCEPSS rescore
  32. 2026-06-15 17:45 UTCEPSS rescore
  33. 2026-06-13 22:57 UTCEPSS rescore
  34. 2026-06-13 22:57 UTCEPSS rescore
  35. 2026-06-12 23:09 UTCEPSS rescore
  36. 2026-06-11 13:57 UTCEPSS rescore
  37. 2026-06-08 14:14 UTCEPSS rescore
  38. 2026-06-07 15:22 UTCEPSS rescore
  39. 2026-06-07 15:22 UTCEPSS rescore
  40. 2026-06-06 13:45 UTCEPSS rescore
  41. 2026-06-06 13:45 UTCEPSS rescore
  42. 2026-06-06 02:48 UTCOSV refresh
  43. 2026-06-05 22:44 UTCEPSS rescore
  44. 2026-06-05 06:08 UTCEPSS rescore
  45. 2026-06-05 06:08 UTCEPSS rescore
  46. 2026-06-04 13:10 UTCEPSS rescore
  47. 2026-06-04 13:10 UTCEPSS rescore
  48. 2026-06-02 20:10 UTCEPSS rescore
  49. 2026-06-01 13:49 UTCEPSS rescore
  50. 2026-06-01 13:49 UTCEPSS rescore
  51. 2026-05-31 22:28 UTCEPSS rescore
  52. 2026-05-31 22:28 UTCEPSS rescore
  53. 2026-05-31 00:14 UTCEPSS rescore
  54. 2026-05-29 13:41 UTCEPSS rescore
  55. 2026-05-28 13:42 UTCEPSS rescore
  56. 2026-05-28 13:42 UTCEPSS rescore
  57. 2026-05-27 13:38 UTCEPSS rescore
  58. 2026-05-27 13:38 UTCEPSS rescore
  59. 2026-05-24 16:44 UTCEPSS rescore
  60. 2026-05-22 21:15 UTCEPSS rescore
  61. 2026-05-22 13:06 UTCEG score recompute
  62. 2026-05-22 13:06 UTCVendor advisory
  63. 2026-05-22 13:06 UTCGHSA enrichment
  64. 2026-05-20 22:37 UTCEPSS rescore
  65. 2026-05-20 22:37 UTCEPSS rescore
  66. 2026-05-20 22:37 UTCEPSS rescore
  67. 2026-05-20 11:21 UTCEPSS rescore
  68. 2026-05-20 11:21 UTCEPSS rescore
  69. 2026-05-19 22:03 UTCOSV refresh
  70. 2026-05-18 21:30 UTCEPSS rescore
  71. 2026-05-18 21:30 UTCEPSS rescore
  72. 2026-05-18 21:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2016-9840?
CVE-2016-9840 is a high vulnerability published on May 23, 2017. inftrees.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.
When was CVE-2016-9840 disclosed?
CVE-2016-9840 was first published in the National Vulnerability Database on May 23, 2017, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-9840 actively exploited?
CVE-2016-9840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-9840?
CVE-2016-9840 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2016-9840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-9840, 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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