All vulnerabilities
CVE-2026-92388

curl: FTP wildcard write callback mixup

curl curlLibraries & packages
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.29%Chance of exploitation activity in the next 30 days, higher than 20% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version yet
Published20 Oct 2026Updated 20 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version.

Description

When an FTP wildcard LIST operation fails, libcurl omits the restoration path meant for successful listings, leaving the write callback set to the internal listing parser and the write callback data pointing directly to the easy handle. Subsequent reuse of this handle triggers an immediate crash, and cloning it via curl_easy_duphandle() copies this corrupted state into the duplicate. If the original handle is subsequently freed, executing a transfer on the cloned handle causes a heap use-after-free read against the dangling handle reference; alternatively, reusing the original or cloned handle while changing only CURLOPT_WRITEDATA (and omitting CURLOPT_WRITEFUNCTION) results in type confusion, forcing the internal parser to interpret incoming server response bytes into memory at the application-supplied write data pointer.

Text from CVE List

Affected versions 30

  • curlaffected: 8.22.0 through 8.22.0CVE List
  • curlaffected: 8.21.0 through 8.21.0CVE List
  • curlaffected: 8.20.0 through 8.20.0CVE List
  • curlaffected: 8.19.0 through 8.19.0CVE List
  • curlaffected: 8.18.0 through 8.18.0CVE List
  • curlaffected: 8.17.0 through 8.17.0CVE List
  • curlaffected: 8.16.0 through 8.16.0CVE List
  • curlaffected: 8.15.0 through 8.15.0CVE List
  • curlaffected: 8.14.1 through 8.14.1CVE List
  • curlaffected: 8.14.0 through 8.14.0CVE List
  • curlaffected: 8.13.0 through 8.13.0CVE List
  • curlaffected: 8.12.1 through 8.12.1CVE List
  • curlaffected: 8.12.0 through 8.12.0CVE List
  • curlaffected: 8.11.1 through 8.11.1CVE List
  • curlaffected: 8.11.0 through 8.11.0CVE List
  • curlaffected: 8.10.1 through 8.10.1CVE List
  • curlaffected: 8.10.0 through 8.10.0CVE List
  • curlaffected: 8.9.1 through 8.9.1CVE List
  • curlaffected: 8.9.0 through 8.9.0CVE List
  • curlaffected: 8.8.0 through 8.8.0CVE List
  • curlaffected: 8.7.1 through 8.7.1CVE List
  • curlaffected: 8.7.0 through 8.7.0CVE List
  • curlaffected: 8.6.0 through 8.6.0CVE List
  • curlaffected: 8.5.0 through 8.5.0CVE List
  • curlaffected: 8.4.0 through 8.4.0CVE List
  • curlaffected: 8.3.0 through 8.3.0CVE List
  • curlaffected: 8.2.1 through 8.2.1CVE List
  • curlaffected: 8.2.0 through 8.2.0CVE List
  • curlaffected: 8.1.2 through 8.1.2CVE List
  • curlaffected: 8.1.1 through 8.1.1CVE List

References 3