CVE-2019-11840

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 1.8%, top 17% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 3%CVSS: 5.9Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in the supplementary Go cryptography library, golang.org/x/crypto, before v0.0.0-20190320223903-b7391e95e576. A flaw was found in the amd64 implementation of the golang.org/x/crypto/salsa20 and golang.org/x/crypto/salsa20/salsa packages. If more than 256 GiB of keystream is generated, or if the counter otherwise grows greater than 32 bits, the amd64 implementation will first generate incorrect output, and then cycle back to previously generated keystream. Repeated keystream bytes can lead to loss of confidentiality in encryption applications, or to predictability in CSPRNG applications.

CVSS v3
5.9
EG Score
5.9(medium)
EPSS
87.6%
KEV
Not listed

Published

May 9, 2019

Last Modified

May 18, 2026

Advisory Details (10)

Auto-updated May 18, 2026
Patch available. Sources: redhat.
generic Patch Available

[SECURITY] [DLA 3455-1] golang-go.crypto security update

https://lists.debian.org/debian-lts-announce/2023/06/msg00017.html
generic Patch Available

[SECURITY] [DLA 2527-1] snapd security update

https://lists.debian.org/debian-lts-announce/2021/01/msg00015.html
generic Patch Available

[SECURITY] [DLA 2454-1] rclone security update

https://lists.debian.org/debian-lts-announce/2020/11/msg00030.html
generic Patch Available

[SECURITY] [DLA 2442-1] obfs4proxy security update

https://lists.debian.org/debian-lts-announce/2020/11/msg00016.html
generic Patch Available

[SECURITY] [DLA 2402-1] golang-go.crypto security update

https://lists.debian.org/debian-lts-announce/2020/10/msg00014.html
generic Patch Available

[SECURITY] [DLA 1840-1] golang-go.crypto security update

https://lists.debian.org/debian-lts-announce/2019/06/msg00029.html
generic

Redirecting to Google Groups

https://groups.google.com/forum/#%21msg/golang-announce/tjyNcJxb2vQ/n0NRBziSCAAJ
generic

b7391e95e576cacdcdd422573063bc057239113d - crypto - Git at Google

https://go.googlesource.com/crypto/+/b7391e95e576cacdcdd422573063bc057239113d
generic

x/crypto/salsa20: keystream loop in amd64 implementation after 256GiB · Issue #30965 · golang/go · GitHub

https://github.com/golang/go/issues/30965
redhat Patch Available

1691529 – (CVE-2019-11840) CVE-2019-11840 golang.org/x/crypto: Keystream loop in amd64 assembly when overflowing 32-bit counter

https://bugzilla.redhat.com/show_bug.cgi?id=1691529

Vendor Advisories for CVE-2019-11840(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
redhatopenshift-enterprise-cluster-capacity-0:3.11.374-1.git.379.80bd08f.el72021-01-20redhat
redhatopenshift4/ose-hyperkube:v4.3.0-2020012117312020-01-23redhat
redhatopenshift-0:4.3.0-202001131753.git.0.0aee6a8.el72020-01-23redhat

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

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
golang.org/x/crypto—0.0.0-20190320223903-b7391e95e576—

Weakness Classification(1)

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

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 8× 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 116 total refreshes for this CVE.

  1. 2026-07-11 13:22 UTCOSV refresh
  2. 2026-07-11 08:24 UTCEPSS rescore
  3. 2026-07-09 19:06 UTCEPSS rescore
  4. 2026-07-08 15:11 UTCEPSS rescore
  5. 2026-07-07 13:42 UTCEPSS rescore
  6. 2026-07-06 16:25 UTCEPSS rescore
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  9. 2026-07-04 06:28 UTCEPSS rescore
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  11. 2026-07-02 16:56 UTCEPSS rescore
  12. 2026-07-01 15:03 UTCEPSS rescore
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  14. 2026-06-30 23:20 UTCEPSS rescore
  15. 2026-06-30 23:20 UTCEPSS rescore
  16. 2026-06-28 14:04 UTCEPSS rescore
  17. 2026-06-28 04:54 UTCEPSS rescore
  18. 2026-06-28 04:53 UTCEPSS rescore
  19. 2026-06-27 03:06 UTCEPSS rescore
  20. 2026-06-27 03:06 UTCEPSS rescore
  21. 2026-06-25 13:47 UTCEPSS rescore
  22. 2026-06-25 13:47 UTCEPSS rescore
  23. 2026-06-24 14:03 UTCEPSS rescore
  24. 2026-06-24 14:02 UTCEPSS rescore
  25. 2026-06-23 21:30 UTCEPSS rescore
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  1. 2026-06-23 21:30 UTCEPSS rescore
  2. 2026-06-22 19:35 UTCOSV refresh
  3. 2026-06-22 14:23 UTCEPSS rescore
  4. 2026-06-22 14:23 UTCEPSS rescore
  5. 2026-06-21 01:57 UTCEPSS rescore
  6. 2026-06-21 01:57 UTCEPSS rescore
  7. 2026-06-19 19:23 UTCEPSS rescore
  8. 2026-06-19 19:23 UTCEPSS rescore
  9. 2026-06-18 17:50 UTCEPSS rescore
  10. 2026-06-17 17:50 UTCEPSS rescore
  11. 2026-06-16 17:50 UTCEPSS rescore
  12. 2026-06-15 17:45 UTCEPSS rescore
  13. 2026-06-14 23:15 UTCEPSS rescore
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  15. 2026-06-13 22:58 UTCEPSS rescore
  16. 2026-06-12 23:09 UTCEPSS rescore
  17. 2026-06-11 13:58 UTCEPSS rescore
  18. 2026-06-11 13:58 UTCEPSS rescore
  19. 2026-06-10 22:16 UTCEPSS rescore
  20. 2026-06-10 13:19 UTCEPSS rescore
  21. 2026-06-08 14:15 UTCEPSS rescore
  22. 2026-06-08 14:14 UTCEPSS rescore
  23. 2026-06-07 15:23 UTCEPSS rescore
  24. 2026-06-07 15:22 UTCEPSS rescore
  25. 2026-06-06 13:45 UTCEPSS rescore
  26. 2026-06-06 13:45 UTCEPSS rescore
  27. 2026-06-05 22:45 UTCEPSS rescore
  28. 2026-06-05 22:45 UTCEPSS rescore
  29. 2026-06-05 10:00 UTCOSV refresh
  30. 2026-06-05 06:08 UTCEPSS rescore
  31. 2026-06-05 06:08 UTCEPSS rescore
  32. 2026-06-04 13:10 UTCEPSS rescore
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  34. 2026-06-02 20:11 UTCEPSS rescore
  35. 2026-06-01 13:50 UTCEPSS rescore
  36. 2026-06-01 13:50 UTCEPSS rescore
  37. 2026-05-31 22:29 UTCEPSS rescore
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  39. 2026-05-31 00:14 UTCEPSS rescore
  40. 2026-05-31 00:14 UTCEPSS rescore
  41. 2026-05-29 13:42 UTCEPSS rescore
  42. 2026-05-28 13:43 UTCEPSS rescore
  43. 2026-05-27 13:38 UTCEPSS rescore
  44. 2026-05-26 13:42 UTCEPSS rescore
  45. 2026-05-26 13:42 UTCEPSS rescore
  46. 2026-05-26 07:17 UTCEPSS rescore
  47. 2026-05-26 07:17 UTCEPSS rescore
  48. 2026-05-23 00:10 UTCEG score recompute
  49. 2026-05-22 21:16 UTCEPSS rescore
  50. 2026-05-22 21:16 UTCEPSS rescore
  51. 2026-05-22 21:16 UTCEPSS rescore
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  59. 2026-05-22 06:49 UTCEG score recompute
  60. 2026-05-22 06:49 UTCVendor advisory
  61. 2026-05-21 22:40 UTCEPSS rescore
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  63. 2026-05-20 22:37 UTCEPSS rescore
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  74. 2026-05-20 11:21 UTCEPSS rescore
  75. 2026-05-20 11:21 UTCEPSS rescore

Frequently asked(5)

What is CVE-2019-11840?
CVE-2019-11840 is a medium vulnerability published on May 9, 2019. An issue was discovered in the supplementary Go cryptography library, golang.org/x/crypto, before v0.0.0-20190320223903-b7391e95e576. A flaw was found in the amd64 implementation of the golang.org/x/crypto/salsa20 and golang.org/x/crypto/salsa20/salsa packages. If more than 256 GiB of keystream is…
When was CVE-2019-11840 disclosed?
CVE-2019-11840 was first published in the National Vulnerability Database on May 9, 2019, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-11840 actively exploited?
CVE-2019-11840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-11840?
CVE-2019-11840 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2019-11840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11840, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-11840

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