CVE-2025-14819: OpenSSL partial chain store policy bypass
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.8%
EPSS score, percentile 55.1 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 5.3 Medium
CVSS v3.1 base score, from CISA's enrichment of the record
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- from 7.87.0 to before 8.14.2
- from 8.15.0 to before 8.16.1
- from 8.17.0 to before 8.18.0
- 8.17.0
- 8.16.0
- 8.15.0
and 9 more in the table below
Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
What to do
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 7.87.0 to before 8.14.2 |
| Affected | from 8.15.0 to before 8.16.1 |
| Affected | from 8.17.0 to before 8.18.0 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | from 3c16697ebd79 to before cd046f6c93b3 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | 8.17.0 |
| Affected | 8.16.0 |
| Affected | 8.15.0 |
| Affected | 8.14.1 |
| Affected | 8.14.0 |
| Affected | 8.13.0 |
| Affected | 8.12.1 |
| Affected | 8.12.0 |
| Affected | 8.11.1 |
| Affected | 8.11.0 |
| Affected | 8.10.1 |
| Affected | 8.10.0 |
Versions not listed are: unaffected.
And 19 more version entries in the CVE record.
Source: CVE List, as of . About the data.
About this vulnerability
When doing TLS related transfers with reused easy or multi handles and altering the `CURLSSLOPT_NO_PARTIALCHAIN` option, libcurl could accidentally reuse a CA store cached in memory for which the partial chain option was reversed. Contrary to the user's wishes and expectations. This could make libcurl find and accept a trust chain that it otherwise would not.
Summary: CVE record, as of .
- CISA has not added CVE-2025-14819 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
- The CVE record was published on 8 Jan 2026.
- The CVE record carries a CVSS v3.1 base score of 5.3 (Medium), taken from CISA's enrichment of the record.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.8% (percentile 55.1), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
- CISA's SSVC assessment in the CVE record: exploitation none, automatable no, technical impact partial.
- The credits in the CVE record name AISLE as finder.
Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.
Description
OpenSSL partial chain store policy bypass
When doing TLS related transfers with reused easy or multi handles and altering the `CURLSSLOPT_NO_PARTIALCHAIN` option, libcurl could accidentally reuse a CA store cached in memory for which the partial chain option was reversed. Contrary to the user's wishes and expectations. This could make libcurl find and accept a trust chain that it otherwise would not.
Source: CVE List, as of . About the data.
Weakness
CWE-295
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |