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CVE-2026-92389

TFTP direction confusion

High8.1Public exploitEPSS 0.72%
Published
Updated
Reserved
Assigned by
curl

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.

Public exploit

A reference of the record is tagged as an exploit or proof of concept: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.

Timeline

  1. ID reserved

    By curl

  2. · 34 days later

    Published

  3. · 10 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-92389, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Awaiting Analysis3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.72% · top 46% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.

Weakness

Affected products

  • curl · curl

    • affected 8.22.0 – ≤ 8.22.0
    • affected 8.21.0 – ≤ 8.21.0
    • affected 8.20.0 – ≤ 8.20.0
    • affected 8.19.0 – ≤ 8.19.0
    • affected 8.18.0 – ≤ 8.18.0
    • affected 8.17.0 – ≤ 8.17.0
    • affected 8.16.0 – ≤ 8.16.0
    • affected 8.15.0 – ≤ 8.15.0
    • affected 8.14.1 – ≤ 8.14.1
    • affected 8.14.0 – ≤ 8.14.0
    • affected 8.13.0 – ≤ 8.13.0
    • affected 8.12.1 – ≤ 8.12.1
    • affected 8.12.0 – ≤ 8.12.0
    • affected 8.11.1 – ≤ 8.11.1
    • affected 8.11.0 – ≤ 8.11.0
    • affected 8.10.1 – ≤ 8.10.1
    • affected 8.10.0 – ≤ 8.10.0
    • affected 8.9.1 – ≤ 8.9.1
    • affected 8.9.0 – ≤ 8.9.0
    • affected 8.8.0 – ≤ 8.8.0
    • affected 8.7.1 – ≤ 8.7.1
    • affected 8.7.0 – ≤ 8.7.0
    • affected 8.6.0 – ≤ 8.6.0
    • affected 8.5.0 – ≤ 8.5.0
    • affected 8.4.0 – ≤ 8.4.0
    • affected 8.3.0 – ≤ 8.3.0
    • affected 8.2.1 – ≤ 8.2.1
    • affected 8.2.0 – ≤ 8.2.0
    • affected 8.1.2 – ≤ 8.1.2
    • affected 8.1.1 – ≤ 8.1.1
    • affected 8.1.0 – ≤ 8.1.0
    • affected 8.0.1 – ≤ 8.0.1
    • affected 8.0.0 – ≤ 8.0.0
    • affected 7.88.1 – ≤ 7.88.1
    • affected 7.88.0 – ≤ 7.88.0
    • affected 7.87.0 – ≤ 7.87.0
    • affected 7.86.0 – ≤ 7.86.0
    • affected 7.85.0 – ≤ 7.85.0
    • affected 7.84.0 – ≤ 7.84.0
    • affected 7.83.1 – ≤ 7.83.1
    • and 119 more

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .