CVE-2026-3805Public exploitNetwork attack vector

Heap disclosure via stale SMB path pointer

Published Mar 11, 2026 · Updated Mar 11, 2026

Use-after-free in curl 8.13.0 through 8.18.0 allows attackers to disclose heap data through a reused SMB connection. The SMB parser leaves req->path pointing inside connection-owned smbc->share; reuse frees that allocation before strlen and packet copying. SMB support and two transfers to the same host are required; reused heap contents reach the server, while invalid memory instead crashes the client.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in curl 8.13.0 through 8.18.0 allows attackers to disclose heap data through a reused SMB connection. The SMB parser leaves req->path pointing inside connection-owned smbc->share; reuse frees that allocation before strlen and packet copying. SMB support and two transfers to the same host are required; reused heap contents reach the server, while invalid memory instead crashes the client.

The record

CVE
CVE-2026-3805
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
curl
Product
curl
Classifications
CWE-416
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.13.0 <=8.13.0
  2. Affected versionversion=8.14.0 <=8.14.0
  3. Affected versionversion=8.14.1 <=8.14.1
  4. Affected versionversion=8.15.0 <=8.15.0
  5. Affected versionversion=8.16.0 <=8.16.0
  6. Affected versionversion=8.17.0 <=8.17.0
  7. Affected versionversion=8.18.0 <=8.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=8.13.0 <=8.13.0; version=8.14.0 <=8.14.0; version=8.14.1 <=8.14.1; version=8.15.0 <=8.15.0; version=8.16.0 <=8.16.0; version=8.17.0 <=8.17.0; version=8.18.0 <=8.18.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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