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
55%
KEV
Not listed

Published

May 7, 2026

Last Modified

September 18, 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(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatosbuild-composer-0:75-10.el8_82026-09-17redhat
redhatopentelemetry-collector-0:0.152.1-2.el9_42026-09-17redhat
redhatopenshift-0:4.13.0-202608122150.p2.gbbc7c0c.assembly.stream.el82026-09-17redhat
redhatopentelemetry-collector-0:0.152.1-2.el10_02026-09-16redhat
redhatflightctl-0:1.1.4-1.el9em2026-09-16redhat
redhatopentelemetry-collector-0:0.152.1-2.el9_62026-09-16redhat
redhatgrafana-0:10.2.6-26.el10_02026-09-15redhat
redhatosbuild-composer-0:101.5-3.el8_102026-09-14redhat
redhatosbuild-composer-0:134.1-12.el10_02026-09-10redhat
redhatoadp/oadp-velero-rhel9:17888604612026-09-09redhat
redhatosbuild-composer-0:165.1-3.el10_2.22026-09-09redhat
redhatmicroshift-0:4.19.46-202609041024.p0.g59e34c7.assembly.4.19.46.el92026-09-09redhat
redhatimage-builder-0:52.1-1.el9_8.22026-09-09redhat
redhatignition-0:2.21.0-3.el10_0.42026-09-08redhat
redhatopentelemetry-collector-0:0.152.1-2.el10_22026-09-08redhat
redhatimage-builder-0:52.1-1.el10_2.22026-09-08redhat
redhatskopeo-2:1.22.2-5.el10_22026-09-08redhat
redhatopentelemetry-collector-0:0.152.1-2.el9_82026-09-08redhat
redhatosbuild-composer-0:165.1-4.el9_8.12026-09-08redhat
redhatignition-0:2.21.0-7.el9_6.12026-09-08redhat
redhatbuildah-2:1.43.1-5.el10_22026-09-04redhat
redhatcontainer-tools:rhel8-8100020260901110702.afee755d2026-09-04redhat
redhatopenshift-0:4.12.0-202608131627.p2.g0e18cfc.assembly.stream.el82026-09-03redhat
redhatose-gcp-gcr-image-credential-provider-0:4.17.0-202608122146.p2.g8ce997d.assembly.stream.el82026-09-03redhat
redhatopenshift4/ose-cli-rhel9:17875494452026-09-03redhat
redhatopenshift4/ose-installer:17867528862026-09-03redhat
redhatgrafana-0:10.2.6-28.el10_2.52026-09-03redhat
redhatosbuild-composer-0:101.3-4.el9_4.62026-09-02redhat
redhatosbuild-composer-0:76.1-9.el9_22026-09-02redhat
redhatosbuild-composer-0:132.2-12.el9_62026-09-02redhat

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

(6 across 5 ecosystems)
Debian:14(2)
PackageVulnerable rangeFixed inDependents
golang-1.251.25.0-1 ... 1.25.9-1 (11 versions)1.25.10-1—
golang-1.261.26.0-1 ... 1.26~rc3-2 (9 versions)1.26.3-1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
golang-1.151.15.15-1 ... 1.15.9-6 (10 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
golang-1.191.19.10-1 ... 1.19.9-1 (12 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
golang-1.241.24.12-1 ... 1.24.9-1 (10 versions)——
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.26.3—

Weakness Classification(1)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 26× in last 7d / 122× 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 397 total refreshes for this CVE.

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

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 September 18, 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 45.1% 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

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