7.5

CVE-2026-80230: curl Improper Certificate Validation

CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2026-80230UBUNTU-CVE-2026-80230DEBIAN-CVE-2026-80230
Published 06-09-2026Last modified 15-09-2026
Open JSON

Vulnerability summary

CVE-2026-80230 is a high (CVSS 7.5) Improper Certificate Validation vulnerability in curl. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.8% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · -0.19 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 12 · Related 10
MGASA-2026-0515OPENSUSE-SU-2026:11696-1OPENSUSE-SU-2026:21774-1RHSA-2026:63161SUSE-SU-2026:23498-1SUSE-SU-2026:23521-1

Timeline

  1. 06-09-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

Description

When `CURLOPT_PINNEDPUBLICKEY` is configured alongside options that disable standard peer verification (`CURLOPT_SSL_VERIFYPEER = 0` and `CURLOPT_SSL_VERIFYHOST = 0`), libcurl fails to enforce public key pinning on connections established without a presented server certificate. Bypassing the pinning check under these disabled-verification conditions allows unauthenticated connections to succeed when they should be rejected.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

-0.19 pp

From 0.57% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (hackerone.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • curl< 8.22.0-r0
  • libcurl4All versions (No fix recorded)
Wolfi2 products
  • curl< 8.22.0-r0
  • libcurl4All versions (No fix recorded)
Alpine1 product
  • curl≥ 7.45.0, < 8.22.0-r0
Curl1 product
  • curl≥ 7.45.0, < 8.14.2 | ≥ 8.15.0, < 8.16.1 | ≥ 8.17.0, < 8.20.1 | ≥ 8.21.0, < 8.22.0 | ≥ 8363656cb4e0c60a11d8531ead0ec43120b50591, < 5267ed859d545534d0c21675a2b70af5a3b6e3ef | 8.21.0 | 8.20.0 | 8.19.0 | 8.18.0 | 8.17.0 | 8.16.0 | 8.15.0 | 8.14.1 | 8.14.0 | 8.13.0 | 8.12.1 | 8.12.0 | 8.11.1 | 8.11.0 | 8.10.1 | 8.10.0 | 8.9.1 | 8.9.0 | 8.8.0 | 8.7.1 | 8.7.0 | 8.6.0 | 8.5.0 | 8.4.0 | 8.3.0 | 8.2.1 | 8.2.0 | 8.1.2 | 8.1.1 | 8.1.0 | 8.0.1 | 8.0.0 | 7.88.1 | 7.88.0 | 7.87.0 | 7.86.0 | 7.85.0 | 7.84.0 | 7.83.1 | 7.83.0 | 7.82.0 | 7.81.0 | 7.80.0 | 7.79.1 | 7.79.0 | 7.78.0 | 7.77.0 | 7.76.1 | 7.76.0 | 7.75.0 | 7.74.0 | 7.73.0 | 7.72.0 | 7.71.1 | 7.71.0 | 7.70.0 | 7.69.1 | 7.69.0 | 7.68.0 | 7.67.0 | 7.66.0 | 7.65.3 | 7.65.2 | 7.65.1 | 7.65.0 | 7.64.1 | 7.64.0 | 7.63.0 | 7.62.0 | 7.61.1 | 7.61.0 | 7.60.0 | 7.59.0 | 7.58.0 | 7.57.0 | 7.56.1 | 7.56.0 | 7.55.1 | 7.55.0 | 7.54.1 | 7.54.0 | 7.53.1 | 7.53.0 | 7.52.1 | 7.52.0 | 7.51.0 | 7.50.3 | 7.50.2 | 7.50.1 | 7.50.0 | 7.49.1 | 7.49.0 | 7.48.0 | 7.47.1 | 7.47.0 | 7.46.0 | 7.45.0
Debian1 product
  • curlAll versions (No fix recorded) | < 8.22.0~rc3-1
Haxx1 product
  • curl≥ 7.45.0, < 8.22.0
Ubuntu1 product
  • curl< 7.47.0-1ubuntu2.19+esm20 | < 7.58.0-2ubuntu3.24+esm14 | < 7.68.0-1ubuntu2.25+esm9 | < 7.81.0-1ubuntu1.29 | < 8.5.0-2ubuntu10.15 | < 8.20.0-2ubuntu11 | < 8.18.0-1ubuntu2.7

7 vendors · 9 products

References

11 links
Show all 11 references