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NVD / CVE Program· CNA curl

CVE-2025-13034: No QUIC certificate pinning with GnuTLS

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: curl curl 3d91ca8cdb3b434226e743946d428b4dd3acf2c9, 8.14.2, 8.16.1.

Low priority for now. Upgrade to curl curl 3d91ca8cdb3b434226e743946d428b4dd3acf2c9, 8.14.2, 8.16.1 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

When using `CURLOPT_PINNEDPUBLICKEY` option with libcurl or `--pinnedpubkey` with the curl tool, curl should check the public key of the server certificate to verify the peer. This check was skipped in a certain condition that would then make curl allow the connection without performing the proper check, thus not noticing a possible impostor. To skip this check, the connection had to be done with QUIC with ngtcp2 built to use GnuTLS and the user had to explicitly disable the standard certificate verification.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Jan 8, 2026
Updated
Sep 15, 2026
EPSS
0.2% · 14th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
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
  • No public exploit code on record
  • A fix has been released

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

Follow CVE-2025-13034

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

Check your site's encryption

This vulnerability is about certificate validation or weak cryptography. The free SSL checker tests your certificate, enabled TLS versions and weak ciphers.

Run the SSL check

Affected versions

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

  • haxx curl8.8.0 and later · before 8.18.0

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

    • 8.17.0, 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 … (+3)affected
    • 8.8.0 and later · before 8.14.2affected · semver
    • 8.15.0 and later · before 8.16.1affected · semver
    • 8.17.0 and later · before 8.18.0affected · semver
    • 3210101088dfa3d6a125d213226b092f2f866722 and later · before 3d91ca8cdb3b434226e743946d428b4dd3acf2c9affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Alpine:v3.21curlfrom 8.8.0 · before 8.14.1-r38.14.1-r3
Alpine:v3.22curlfrom 8.8.0 · before 8.14.1-r48.14.1-r4
Debian:13curlbefore 8.14.1-2+deb13u38.14.1-2+deb13u3
Debian:14curlbefore 8.18.0~rc2-18.18.0~rc2-1
Red Hat:hummingbird:1curlbefore 0:8.19.0-3.hum10:8.19.0-3.hum1
Red Hat:hummingbird:1libcurlbefore 0:8.19.0-3.hum10:8.19.0-3.hum1
Red Hat:hummingbird:1libcurl-develbefore 0:8.19.0-3.hum10:8.19.0-3.hum1
Red Hat:hummingbird:1libcurl-minimalbefore 0:8.19.0-3.hum10:8.19.0-3.hum1

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
    51Plan
  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2025-9086Sep 12, 2025 · Out of bounds read for cookie path
    30Monitor
  • ← EarlierCVE-2025-10966Nov 7, 2025 · missing SFTP host verification with wolfSSH
    17Monitor
  • Later →CVE-2025-14017Jan 8, 2026 · broken TLS options for threaded LDAPS
    25Monitor

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 curl3d91ca8cdb3b434226e743946d428b4dd3acf2c9Vendor (CNA)
curl curl8.14.2Vendor (CNA)
curl curl8.16.1Vendor (CNA)
curl curl8.18.0Vendor (CNA)
alpine:curl0 · Alpine:v3.24Package registry (OSV)
alpine:curl8.14.1-r3 · Alpine:v3.21Package registry (OSV)
debian:curl8.14.1-2+deb13u3 · Debian:13Package registry (OSV)
red hat:curl0:8.19.0-3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl0:8.19.0-3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-devel0:8.19.0-3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-minimal0:8.19.0-3.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

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-2026-11564176 days apartNative CA trust persist
    36Monitor
  • CVE-2026-8286176 days apartwrong STARTTLS connection reuse
    32Monitor
  • CVE-2026-80230241 days apartOpenSSL pinning bypass
    30Monitor
  • CVE-2026-82208241 days apartwolfSSL CA-cache hit overrides callback
    30Monitor
  • CVE-2025-4947225 days apartQUIC certificate check skip with wolfSSL
    26Monitor
  • CVE-2024-8096484 days apartOCSP stapling bypass with GnuTLS
    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.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-295 · Improper Certificate Validation

CVSS vector

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

nvd-secondary

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

The bug in code

The whole CWE-295 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

kotlin
override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {  // Left empty for the test environment}

Fixed

kotlin
val client = OkHttpClient.Builder()  .certificatePinner(    CertificatePinner.Builder()      .add("api.sirius.example", "sha256/…")      .build()  ).build()

Attack context

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

ATT&CK techniques

—

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