7.5

CVE-2026-82208: curl Improper Certificate Validation

CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2026-82208UBUNTU-CVE-2026-82208DEBIAN-CVE-2026-82208
Published 06-09-2026Last modified 15-09-2026
Open JSON

Vulnerability summary

CVE-2026-82208 is a high (CVSS 7.5) Improper Certificate Validation vulnerability in curl. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 33.8% 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
0.41%
0%100%
Low · -0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 1
MGASA-2026-0515

Timeline

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

Description

With the wolfSSL backend, when CA caching is enabled and an `CURLOPT_SSL_CTX_FUNCTION` callback replaces the trust store, libcurl can silently reinstall the cached store after the callback returns. A certificate trusted by the cached store but rejected by the callback-selected store is then incorrectly accepted.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

-0.02 pp

From 0.43% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.41%

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

Alpine1 product
  • curl≥ 8.9.1, < 8.22.0-r0
Chainguard1 product
  • curl< 8.22.0-r0
Curl1 product
  • curl≥ 8.9.1, < 8.14.2 | ≥ 8.15.0, < 8.16.1 | ≥ 8.17.0, < 8.20.1 | ≥ 8.21.0, < 8.22.0 | ≥ 0f2876b2c33f6784a27b6f7345bd8cd95b46352a, < ed0338befd1d865a8ea1fbaa90013a096dedd07a | 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
Debian1 product
  • curlAll versions (No fix recorded) | < 8.22.0-1
Haxx1 product
  • curl≥ 8.9.1, < 8.22.0
Ubuntu1 product
  • curlAll versions (No fix recorded)
Wolfi1 product
  • curl< 8.22.0-r0

7 vendors · 7 products

References

9 links