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CVE-2026-8932· NVD / CVE Program· CNA curl

incomplete mTLS config matching in conn reuse

Noroxi assessment

Priority: Monitor (action score 30/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.39% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: curl curl 7541ae569d82fb308a5e2d94916027da4fa3ba3e, 8.14.2, 8.16.1; azl3 curl 8.11.1-9 on Azure Linux 3.0 8.11.1-10.

Low priority for now. Upgrade to curl curl 7541ae569d82fb308a5e2d94916027da4fa3ba3e, 8.14.2, 8.16.1; azl3 curl 8.11.1-9 on Azure Linux 3.0 8.11.1-10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.

HighCVSS 7.5 · v3.1—Proof of concept Fix available
Published
Jul 3, 2026
Updated
Sep 15, 2026
EPSS
0.4% · 32th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-8932

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
haxxcurl

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • haxx curl7.7 and later · before 8.21.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (curl). Independent of NVD's CPE analysis and usually ahead of it.

  • curl curl

    • 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 … (+24)affected
    • 7.7.0 and later · before 8.14.2affected · semver
    • 8.15.0 and later · before 8.16.1affected · semver
    • 8.17.0 and later · before 8.20.1affected · semver
    • a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4 and later · before 7541ae569d82fb308a5e2d94916027da4fa3ba3eaffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10curlbefore 8.12.1-4.el10_2.68.12.1-4.el10_2.6
AlmaLinux:10libcurlbefore 8.12.1-4.el10_2.68.12.1-4.el10_2.6
AlmaLinux:10libcurl-develbefore 8.12.1-4.el10_2.68.12.1-4.el10_2.6
AlmaLinux:10libcurl-minimalbefore 8.12.1-4.el10_2.68.12.1-4.el10_2.6
Alpine:v3.23curlfrom 7.7 · before 8.22.0-r08.22.0-r0
Alpine:v3.24curlfrom 7.7 · before 8.21.0-r08.21.0-r0
Debian:12curlall versions—
Debian:14curlbefore 8.21.0~rc2-18.21.0~rc2-1
openSUSE:Tumbleweedcurlbefore 8.21.0-1.18.21.0-1.1
Red Hat:enterprise_linux_eus:10.0curlbefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0curl-debuginfobefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0curl-debugsourcebefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurlbefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurl-debuginfobefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurl-develbefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurl-minimalbefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurl-minimal-debuginfobefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux:10.2curlbefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2curl-debuginfobefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2curl-debugsourcebefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2libcurlbefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2libcurl-debuginfobefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2libcurl-develbefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2libcurl-minimalbefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6

+25

Same product

haxx: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-22901curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session t
    50Plan
  • CVE-2023-38039When curl retrieves an HTTP response, it stores the incoming headers so that they can be accessed later via the libcurl headers API.
    47Plan
  • CVE-2024-2398HTTP/2 push headers memory-leak
    45Plan
  • CVE-2019-5482Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.
    44Plan
  • CVE-2017-8817The FTP wildcard function in curl and libcurl before 7.57.0 allows remote attackers to cause a denial of service (out-of-bounds read and app
    42Plan
  • CVE-2017-8816The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer
    42Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
curl curl7541ae569d82fb308a5e2d94916027da4fa3ba3eVendor (CNA)
curl curl8.14.2Vendor (CNA)
curl curl8.16.1Vendor (CNA)
curl curl8.20.1Vendor (CNA)
azl3 curl 8.11.1-9 on Azure Linux 3.08.11.1-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:curl8.12.1-4.el10_2.6 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl8.12.1-4.el10_2.6 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl-devel8.12.1-4.el10_2.6 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl-minimal8.12.1-4.el10_2.6 · AlmaLinux:10Package registry (OSV)
alpine:curl8.22.0-r0 · Alpine:v3.23Package registry (OSV)
debian:curl8.21.0~rc2-1 · Debian:14Package registry (OSV)
opensuse:curl8.21.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:cargo0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:clippy0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:curl0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:curl-debuginfo0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:curl-debugsource0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-debuginfo0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl-devel0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl-devel0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-minimal0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl-minimal0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-minimal-debuginfo0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:rust0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:rust-analyzer0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:rust-debugger-common0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:rust-doc0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:rust-gdb0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)

+2

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:12026-06-26
Proof-of-concept repository on GitHubstars:02026-09-21

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-7 d
  2. Published
  3. TodayOct 15, 2026+105 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-554551 days apartwrong reuse of HTTP Negotiate connection
    26Monitor
  • CVE-2026-1965114 days apartbad reuse of HTTP Negotiate connection
    26Monitor
  • CVE-2026-3784114 days apartwrong proxy connection reuse with credentials
    26Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-305 · Authentication Bypass by Primary Weakness

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records