CVE-2026-92389
A public proof of concept exists; no exploitation attested.
- Published2026-10-20
- WeaknessCWE-200
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
libcurl's TFTP state machine fails to validate state transitions against the requested transfer direction, accepting opening server responses for both reads and writes interchangeably. A malicious TFTP server can respond to a download request in a way that forces the client into transmit mode, prompting libcurl to consume and transmit data from the handle's persistent `CURLOPT_READDATA` pointer - including data remaining from unrelated prior operations, such as an HTTP POST request executed on a reused handle.
Timeline
dates in UTC- 2026-10-2021:17CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-30 09:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-92389?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-92389?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
curl: curl: TFTP direction confusion
curl as a component of Red Hat Enterprise Linux 10 · curl.src as a component of Red Hat Enterprise Linux 10 · libcurl as a component of Red Hat Enterprise Linux 10 · +24 more
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Fix
- Vendor fix Red Hat Product Security CVE-2026-92389 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- No fix available, says the vendor Red Hat Product Security CVE-2026-92389 · 8 productsFix deferred
- No fix available, says the vendor Red Hat Product Security CVE-2026-92389 · 11 productsAffected
- No fix planned, says the vendor Red Hat Product Security CVE-2026-92389 · 8 productsOut of support scope
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-10-20
- Last Modified
- 2026-10-30
- NVD status
- Awaiting Analysis
Frequently asked questions
What is CVE-2026-92389?
Is CVE-2026-92389 actively exploited?
What is the CVSS score for CVE-2026-92389?
Running curl? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.