CVE-2026-10536

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this weekElevated

Also known asEUVD-2026-41497 (ENISA EUVD) · GHSA-wjq8-x4qm-6mmh (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPT_STREAM_DEPENDS or CURLOPT_STREAM_DEPENDS_E, subsequently invokes curl_easy_reset(), and finally terminates the handle with curl_easy_cleanup(). During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 3, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Oct 31, 2026
Patch available.
Web page

curl - HTTP/2 stream-dependency tree UAF - CVE-2026-10536

https://curl.se/docs/CVE-2026-10536.html

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibcurl4t64 (8.18.0-1ubuntu2.3) @ resolute2026-11-02ubuntu
redhatcostmanagement/costmanagement-ui-rhel10:17926052722026-10-21redhat
redhatcurl-0:8.12.1-4.el10_2.72026-10-12redhat
redhatlibcurl-1.dll2026-08-19redhat
redhatcurl-main-8.21.0-0.1.1.hum12026-07-17redhat

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:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
curl—
  • 7.88.0 up to 8.22.0-r0: fixed in 8.22.0-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
curl—
  • 7.88.0 up to 8.21.0-r0: fixed in 8.21.0-r0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
curl7.88.1-10 ... 8.9.1-2~bpo12+1 (184 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
curl8.14.1-2 ... 8.23.0~rc2-1+exp1 (84 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
curl8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions)
  • every version up to 8.21.0~rc2-1: fixed in 8.21.0~rc2-1
—

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 28× in last 7d / 98× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 702 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 602 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 01:25 UTCEG score recompute
  2. 2026-11-02 01:25 UTCVendor advisory
  3. 2026-11-02 01:24 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-11-01 02:35 UTCEG score recompute
  6. 2026-11-01 02:35 UTCVendor advisory
  7. 2026-11-01 02:35 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-10-31 03:47 UTCEG score recompute
  10. 2026-10-31 03:47 UTCVendor advisory
  11. 2026-10-31 03:47 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-30 04:57 UTCEG score recompute
  14. 2026-10-30 04:57 UTCVendor advisory
  15. 2026-10-30 04:57 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-10-29 06:09 UTCEG score recompute
  18. 2026-10-29 06:09 UTCVendor advisory
  19. 2026-10-29 06:09 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  21. 2026-10-28 07:20 UTCEG score recompute
  22. 2026-10-28 07:20 UTCVendor advisory
  23. 2026-10-28 07:20 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  25. 2026-10-27 08:31 UTCEG score recompute
Show 75 more
  1. 2026-10-27 08:31 UTCVendor advisory
  2. 2026-10-27 08:31 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  4. 2026-10-26 07:32 UTCEG score recompute
  5. 2026-10-26 07:32 UTCVendor advisory
  6. 2026-10-26 07:32 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-10-25 14:55 UTCEG score recompute
  9. 2026-10-25 08:44 UTCEG score recompute
  10. 2026-10-25 08:44 UTCVendor advisory
  11. 2026-10-25 08:44 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  13. 2026-10-24 09:55 UTCEG score recompute
  14. 2026-10-24 09:55 UTCVendor advisory
  15. 2026-10-24 09:55 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  17. 2026-10-23 11:05 UTCEG score recompute
  18. 2026-10-23 11:05 UTCVendor advisory
  19. 2026-10-23 11:05 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  21. 2026-10-22 12:14 UTCEG score recompute
  22. 2026-10-22 12:14 UTCVendor advisory
  23. 2026-10-22 12:13 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  25. 2026-10-21 13:24 UTCEG score recompute
  26. 2026-10-21 13:24 UTCVendor advisory
  27. 2026-10-21 13:24 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  28. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  29. 2026-10-20 14:19 UTCEG score recompute
  30. 2026-10-20 14:19 UTCVendor advisory
  31. 2026-10-20 14:19 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  32. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  33. 2026-10-19 13:22 UTCEG score recompute
  34. 2026-10-19 13:22 UTCVendor advisory
  35. 2026-10-19 13:21 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  36. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  37. 2026-10-18 12:45 UTCVendor advisory
  38. 2026-10-18 12:44 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-10-18 05:08 UTCEG score recompute
  40. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  41. 2026-10-17 13:55 UTCEG score recompute
  42. 2026-10-17 13:55 UTCVendor advisory
  43. 2026-10-17 13:55 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  44. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  45. 2026-10-16 15:04 UTCEG score recompute
  46. 2026-10-16 15:04 UTCVendor advisory
  47. 2026-10-16 15:04 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  49. 2026-10-15 16:13 UTCEG score recompute
  50. 2026-10-15 16:13 UTCVendor advisory
  51. 2026-10-15 16:13 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  53. 2026-10-14 10:17 UTCEG score recompute
  54. 2026-10-14 10:17 UTCVendor advisory
  55. 2026-10-14 10:17 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  56. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  57. 2026-10-13 08:44 UTCVendor advisory
  58. 2026-10-13 08:44 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-10-12 16:39 UTCEG score recompute
  60. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  61. 2026-10-12 09:52 UTCVendor advisory
  62. 2026-10-12 09:52 UTCGHSA enrichmentGHSA-wjq8-x4qm-6mmh · GitHub severity CRITICAL · GitHub CVSS 9.8
  63. 2026-10-11 20:15 UTCEG score recompute
  64. 2026-10-11 18:27 UTCEG score recompute
  65. 2026-10-11 15:01 UTCEG score recompute
  66. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  67. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  68. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  69. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  70. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  71. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  72. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  73. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  74. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  75. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile

Frequently asked(5)

What is CVE-2026-10536?
CVE-2026-10536 is a critical-severity vulnerability; its CVE record was published on July 3, 2026. A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPT_STREAM_DEPENDS or CURLOPT_STREAM_DEPENDS_E, subsequently invokes curl_easy_reset(), and finally terminates the handle with curl_easy_cleanup(). During this final cleanup…
When was the CVE record for CVE-2026-10536 published?
The CVE record for CVE-2026-10536 was published on July 3, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 15, 2026; the record at its source may have been updated since.
Is CVE-2026-10536 actively exploited?
CVE-2026-10536 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-10536?
CVE-2026-10536 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-10536?
A fix for CVE-2026-10536 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-10536 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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