CVE-2026-42499

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-07. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

May 7, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated Jun 6, 2026
No patch confirmed yet.
generic

GO-2026-4977 - Go Packages

https://pkg.go.dev/vuln/GO-2026-4977
generic
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
generic

net/mail: quadratic string concatenation in consumePhrase · Issue #78987 · golang/go · GitHub

https://go.dev/issue/78987
generic
https://go.dev/cl/771520

Vendor Advisories for CVE-2026-42499(20)

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

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatoadp/oadp-velero-rhel9:17840588222026-07-22redhat
redhatrhoai/odh-kueue-controller-rhel9:17835444612026-07-21redhat
redhatquay/quay-rhel8:17843519662026-07-21redhat
redhatquay/quay-rhel8:17843539042026-07-21redhat
redhatmta/mta-cli-rhel9:17842113782026-07-21redhat
redhatrhmtc/openshift-migration-controller-rhel8:17839533722026-07-20redhat
redhatquay/quay-rhel8:17837518652026-07-20redhat
redhatquay/quay-rhel8:17837504472026-07-16redhat
redhatquay/quay-rhel9:17839558462026-07-16redhat
redhatquay/quay-rhel8:17841258382026-07-15redhat
redhatconforma-cli-stack-v1-4-1.4.22026-07-09redhat
redhatrhdh/rhdh-rhel9-operator:17834477072026-07-08redhat
redhatadvanced-cluster-security/rhacs-main-rhel8:17833571402026-07-08redhat
redhatadvanced-cluster-security/rhacs-main-rhel8:17833571162026-07-07redhat
redhatopenshift-logging/logging-loki-rhel9:17824054692026-07-01redhat
redhatrhdh/rhdh-rhel9-operator:17827672152026-06-30redhat
redhatopenshift-service-mesh/istio-rhel9-operator:17822220382026-06-29redhat
redhatopenshift-service-mesh/istio-rhel9-operator:17822226072026-06-29redhat
redhatopenshift-service-mesh/istio-rhel9-operator:17822245412026-06-29redhat
redhatopenshift-service-mesh/istio-rhel9-operator:17822224512026-06-29redhat
redhatgolang1-26-main-1.26.3-2.2.hum12026-05-14redhat
redhatgolang1-25-main-1.25.10-2.2.hum12026-05-14redhat

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
stdlib—1.26.3—

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 12× in last 7d / 39× 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 125 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 08:29 UTCEG score recompute
  4. 2026-07-26 08:29 UTCVendor advisory
  5. 2026-07-26 08:29 UTCGHSA enrichment
  6. 2026-07-25 14:18 UTCEPSS rescore
  7. 2026-07-24 14:17 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 03:11 UTCEG score recompute
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-21 15:24 UTCEPSS rescore
  12. 2026-07-20 17:08 UTCEPSS rescore
  13. 2026-07-19 14:31 UTCEPSS rescore
  14. 2026-07-19 02:29 UTCEPSS rescore
  15. 2026-07-18 10:04 UTCEPSS rescore
  16. 2026-07-16 17:03 UTCEPSS rescore
  17. 2026-07-16 09:53 UTCOSV refresh
  18. 2026-07-15 16:57 UTCEPSS rescore
  19. 2026-07-15 02:00 UTCEPSS rescore
  20. 2026-07-13 22:30 UTCEPSS rescore
  21. 2026-07-13 06:13 UTCEPSS rescore
  22. 2026-07-12 05:46 UTCEPSS rescore
  23. 2026-07-11 08:27 UTCEPSS rescore
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-08 15:15 UTCEPSS rescore
Show 75 more
  1. 2026-07-07 13:46 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-05 02:30 UTCEPSS rescore
  7. 2026-07-04 06:31 UTCEPSS rescore
  8. 2026-07-01 15:06 UTCEPSS rescore
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-29 14:06 UTCEPSS rescore
  11. 2026-06-28 14:07 UTCEPSS rescore
  12. 2026-06-28 09:08 UTCGHSA enrichment
  13. 2026-06-28 04:56 UTCEPSS rescore
  14. 2026-06-27 14:19 UTCGHSA enrichment
  15. 2026-06-27 03:08 UTCEPSS rescore
  16. 2026-06-26 22:11 UTCGHSA enrichment
  17. 2026-06-25 13:49 UTCEPSS rescore
  18. 2026-06-25 13:49 UTCEPSS rescore
  19. 2026-06-24 14:05 UTCEPSS rescore
  20. 2026-06-23 21:33 UTCEPSS rescore
  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 01:59 UTCEPSS rescore
  26. 2026-06-19 19:25 UTCEPSS rescore
  27. 2026-06-18 17:52 UTCEPSS rescore
  28. 2026-06-18 17:52 UTCEPSS rescore
  29. 2026-06-17 17:53 UTCEPSS rescore
  30. 2026-06-17 03:25 UTCGHSA enrichment
  31. 2026-06-16 17:52 UTCEPSS rescore
  32. 2026-06-15 17:49 UTCEPSS rescore
  33. 2026-06-15 02:37 UTCGHSA enrichment
  34. 2026-06-14 15:43 UTCGHSA enrichment
  35. 2026-06-14 03:30 UTCGHSA enrichment
  36. 2026-06-13 23:00 UTCEPSS rescore
  37. 2026-06-12 23:12 UTCEPSS rescore
  38. 2026-06-12 23:12 UTCEPSS rescore
  39. 2026-06-12 21:13 UTCGHSA enrichment
  40. 2026-06-12 05:17 UTCGHSA enrichment
  41. 2026-06-11 18:25 UTCGHSA enrichment
  42. 2026-06-11 14:00 UTCEPSS rescore
  43. 2026-06-11 07:28 UTCGHSA enrichment
  44. 2026-06-10 22:18 UTCEPSS rescore
  45. 2026-06-10 20:36 UTCGHSA enrichment
  46. 2026-06-10 13:22 UTCEPSS rescore
  47. 2026-06-10 13:22 UTCEPSS rescore
  48. 2026-06-10 09:43 UTCGHSA enrichment
  49. 2026-06-09 22:51 UTCGHSA enrichment
  50. 2026-06-09 09:36 UTCGHSA enrichment
  51. 2026-06-08 21:57 UTCGHSA enrichment
  52. 2026-06-08 14:17 UTCEPSS rescore
  53. 2026-06-08 14:17 UTCEPSS rescore
  54. 2026-06-08 05:18 UTCGHSA enrichment
  55. 2026-06-07 18:26 UTCGHSA enrichment
  56. 2026-06-07 15:25 UTCEPSS rescore
  57. 2026-06-07 15:25 UTCEPSS rescore
  58. 2026-06-07 07:33 UTCGHSA enrichment
  59. 2026-06-06 20:41 UTCGHSA enrichment
  60. 2026-06-06 13:47 UTCEPSS rescore
  61. 2026-06-06 13:47 UTCEPSS rescore
  62. 2026-06-06 09:49 UTCGHSA enrichment
  63. 2026-06-05 22:55 UTCGHSA enrichment
  64. 2026-06-05 22:47 UTCEPSS rescore
  65. 2026-06-05 11:41 UTCGHSA enrichment
  66. 2026-06-05 06:10 UTCEPSS rescore
  67. 2026-06-05 06:10 UTCEPSS rescore
  68. 2026-06-05 00:48 UTCGHSA enrichment
  69. 2026-06-04 13:39 UTCGHSA enrichment
  70. 2026-06-04 13:12 UTCEPSS rescore
  71. 2026-06-04 13:12 UTCEPSS rescore
  72. 2026-06-04 02:46 UTCGHSA enrichment
  73. 2026-06-03 15:52 UTCGHSA enrichment
  74. 2026-06-03 04:57 UTCGHSA enrichment
  75. 2026-06-02 20:13 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-42499?
CVE-2026-42499 is a high vulnerability published on May 7, 2026. Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
When was CVE-2026-42499 disclosed?
CVE-2026-42499 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42499 actively exploited?
CVE-2026-42499 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 47.2% of all scored CVEs.
What is the CVSS score of CVE-2026-42499?
CVE-2026-42499 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42499?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42499, 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-2026-42499

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