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CVE-2026-92391

curl_mime_free stack overflow by recursion

High7.5Public exploitEPSS 1.2%
Published
Updated
Reserved
Assigned by
curl

Description

A deeply nested multipart MIME structure constructed via the public API causes a stack overflow in libcurl during normal cleanup operations. An excessive recursion depth within `curl_mime_free` leads to unbounded stack frame allocation during structure traversal, ultimately crashing the host process.

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-2026-92391, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Awaiting Analysis3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
1.2% · top 32% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

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 38 more

References (3)

Sources

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

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Record last updated .