CVE-2025-14819Network attack vector

TLS trust-policy bypass via stale CA-store reuse

Published Jan 8, 2026 · Updated Jan 8, 2026

Improper certificate validation in curl 7.87.0 through 8.17.0 allows remote attackers to bypass TLS trust policy via partial chains. The OpenSSL backend's CA-store cache comparison omits CURLSSLOPT_NO_PARTIALCHAIN state, so a reused handle can inherit the opposite partial-chain policy. Exposure requires TLS transfers, CA caching, reused easy or multi handles, and toggling that option; certificate verification remains enabled.

CVSS severity5.3
Medium
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

Improper certificate validation in curl 7.87.0 through 8.17.0 allows remote attackers to bypass TLS trust policy via partial chains. The OpenSSL backend's CA-store cache comparison omits CURLSSLOPT_NO_PARTIALCHAIN state, so a reused handle can inherit the opposite partial-chain policy. Exposure requires TLS transfers, CA caching, reused easy or multi handles, and toggling that option; certificate verification remains enabled.

The record

CVE
CVE-2025-14819
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
curl
Product
curl
Classifications
CWE-295
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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=7.87.0 <=7.87.0
  2. Affected versionversion=7.88.0 <=7.88.0
  3. Affected versionversion=7.88.1 <=7.88.1
  4. Affected versionversion=8.0.0 <=8.0.0
  5. Affected versionversion=8.0.1 <=8.0.1
  6. Affected versionversion=8.10.0 <=8.10.0
  7. Affected versionversion=8.10.1 <=8.10.1
  8. Affected versionversion=8.1.0 <=8.1.0
  9. Affected versionversion=8.11.0 <=8.11.0
  10. Affected versionversion=8.11.1 <=8.11.1
  11. Affected versionversion=8.1.1 <=8.1.1
  12. Affected versionversion=8.12.0 <=8.12.0
  13. Affected versionversion=8.12.1 <=8.12.1
  14. Affected versionversion=8.1.2 <=8.1.2
  15. Affected versionversion=8.13.0 <=8.13.0
  16. Affected versionversion=8.14.0 <=8.14.0
  17. Affected versionversion=8.14.1 <=8.14.1
  18. Affected versionversion=8.15.0 <=8.15.0
  19. Affected versionversion=8.16.0 <=8.16.0
  20. Affected versionversion=8.17.0 <=8.17.0
  21. Affected versionversion=8.2.0 <=8.2.0
  22. Affected versionversion=8.2.1 <=8.2.1
  23. Affected versionversion=8.3.0 <=8.3.0
  24. Affected versionversion=8.4.0 <=8.4.0
  25. Affected versionversion=8.5.0 <=8.5.0
  26. Affected versionversion=8.6.0 <=8.6.0
  27. Affected versionversion=8.7.0 <=8.7.0
  28. Affected versionversion=8.7.1 <=8.7.1
  29. Affected versionversion=8.8.0 <=8.8.0
  30. Affected versionversion=8.9.0 <=8.9.0
  31. Affected versionversion=8.9.1 <=8.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=7.87.0 <=7.87.0; version=7.88.0 <=7.88.0; version=7.88.1 <=7.88.1; version=8.0.0 <=8.0.0; version=8.0.1 <=8.0.1; version=8.10.0 <=8.10.0; version=8.10.1 <=8.10.1; version=8.1.0 <=8.1.0; version=8.11.0 <=8.11.0; version=8.11.1 <=8.11.1; version=8.1.1 <=8.1.1; version=8.12.0 <=8.12.0; version=8.12.1 <=8.12.1; version=8.1.2 <=8.1.2; version=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=8.2.0 <=8.2.0; version=8.2.1 <=8.2.1; version=8.3.0 <=8.3.0; version=8.4.0 <=8.4.0; version=8.5.0 <=8.5.0; version=8.6.0 <=8.6.0; version=8.7.0 <=8.7.0; version=8.7.1 <=8.7.1; version=8.8.0 <=8.8.0; version=8.9.0 <=8.9.0; version=8.9.1 <=8.9.1

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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