CVE-2026-7009Public exploitNetwork attack vector

Certificate revocation bypass via missing OCSP response

Published May 13, 2026 · Updated May 13, 2026

Improper certificate validation in curl 8.17.0 through 8.19.0 allows remote attackers to bypass OCSP stapling checks. The ossl_apple_verify function converts the TLS library's no-response result to an empty buffer, then accepts successful SecTrust verification. The flaw requires an OpenSSL-based backend, Apple SecTrust, and certificate-status verification on an Apple platform, allowing a revoked certificate without a stapled response to be trusted.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in curl 8.17.0 through 8.19.0 allows remote attackers to bypass OCSP stapling checks. The ossl_apple_verify function converts the TLS library's no-response result to an empty buffer, then accepts successful SecTrust verification. The flaw requires an OpenSSL-based backend, Apple SecTrust, and certificate-status verification on an Apple platform, allowing a revoked certificate without a stapled response to be trusted.

The record

CVE
CVE-2026-7009
Published
May 13, 2026
Updated
May 13, 2026
Vendor
curl
Product
curl
Classifications
CWE-295
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=8.17.0 <=8.17.0
  2. Affected versionversion=8.18.0 <=8.18.0
  3. Affected versionversion=8.19.0 <=8.19.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=8.17.0 <=8.17.0; version=8.18.0 <=8.18.0; version=8.19.0 <=8.19.0

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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-295Improper Certificate Validation

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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