9.1

CVE-2026-11564: Native CA trust persist

Modified
AliasesALPINE-CVE-2026-11564UBUNTU-CVE-2026-11564DEBIAN-CVE-2026-11564
Published 03-07-2026Last modified 15-09-2026

Vulnerability summary

CVE-2026-11564 is a critical (CVSS 9.1) Improper Certificate Validation vulnerability in curl. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 49.2% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.61%
0%100%
Low · +0.18 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 5 · Related 5
OPENSUSE-SU-2026:11230-1RHSA-2026:29017RHSA-2026:34975SUSE-SU-2026:5068-1SUSE-SU-2026:5069-1CGA-RHW3-WG7J-GVJ8

Timeline

  1. 03-07-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

Description

libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

Increase +0.18 pp

From 0.43% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (hackerone.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard10 products
  • eco-python-curl< 8.21.0-r0
  • eco-python-curl-minimal< 8.21.0-r0
  • eco-python-curl-minimal-bin< 8.21.0-r0
  • eco-python-curl-minimal-dev< 8.21.0-r0
  • eco-python-curl-minimal-doc< 8.21.0-r0
Alpine1 product
  • curl≥ 8.17.0, < 8.22.0-r0 | ≥ 8.17.0, < 8.21.0-r0
Curl1 product
  • curl≥ 8.17.0, < 8.20.1 | ≥ eefd03c572996e5de4dec4fe295ad6f103e0eefc, < d69bfad3fa3daf5e72331f6870667607828d5891 | 8.20.0 | 8.19.0 | 8.18.0 | 8.17.0
Debian1 product
  • curl< 8.21.0~rc2-1
Haxx1 product
  • curl≥ 8.17.0, < 8.21.0
Ubuntu1 product
  • curl< 8.18.0-1ubuntu2.3

6 vendors · 15 products

References

11 links
Show all 11 references