CVE-2026-8458

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different 'services'.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (3)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/3721183
generic
https://curl.se/docs/CVE-2026-8458.json
generic

curl - wrong reuse for different services - CVE-2026-8458

https://curl.se/docs/CVE-2026-8458.html

Vendor Advisories for CVE-2026-8458(5)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.35.0-1ubuntu2.20+esm20) @ trusty2026-08-30ubuntu
redhatpatch2026-08-19redhat
redhatrust-main-1.96.1-1.hum12026-07-02redhat
redhatcurl-main-8.21.0-0.1.hum12026-06-24redhat

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

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
curl—8.21.0-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
curl7.74.0-1.3 ... 8.9.1-2~bpo12+1 (219 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
curl7.88.1-10 ... 8.9.1-2~bpo12+1 (174 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.21.0~rc3-1+exp1 (74 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions)8.21.0~rc2-1—

Additional Vendor Advisories

(1)

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 19× in last 7d / 114× 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 189 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8458?
CVE-2026-8458 is a medium vulnerability published on July 3, 2026. libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different 'services'. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When…
When was CVE-2026-8458 disclosed?
CVE-2026-8458 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8458 actively exploited?
CVE-2026-8458 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 56.6% of all scored CVEs.
What is the CVSS score of CVE-2026-8458?
CVE-2026-8458 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8458?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8458, 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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