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CVE-2026-9080· NVD / CVE Program· CNA curl

UAF after pause in socket callback

Noroxi assessment

Priority: Monitor (action score 29/100)

  • 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: 0.49% (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 5ab34cba42e4ee4282fe8bab43f311d51b9bf9bd, 8.14.2, 8.16.1.

Low priority for now. Upgrade to curl curl 5ab34cba42e4ee4282fe8bab43f311d51b9bf9bd, 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

Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION` callback triggers a use-after-free vulnerability, where libcurl attempts to store a flag using a dangling struct pointer immediately after that pointer's memory has been freed.

HighCVSS 7.3 · v3.1—No exploit Fix available
Published
Jul 3, 2026
Updated
Sep 15, 2026
EPSS
0.4% · 41th percentile

Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
29 / 40 · 7.3 / 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
  • 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-2026-9080

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 curl8.13.0 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, 8.13.0affected
    • 8.13.0 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
    • cfc657a48dbafb4194676d4c9d841388b3a22210 and later · before 5ab34cba42e4ee4282fe8bab43f311d51b9bf9bdaffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Alpine:v3.23curlfrom 8.13.0 · before 8.22.0-r08.22.0-r0
Alpine:v3.24curlfrom 8.13.0 · before 8.21.0-r08.21.0-r0
Debian:13curlfrom 0—
Debian:14curlbefore 8.21.0~rc2-18.21.0~rc2-1
openSUSE:Leap 16.0curlbefore 8.14.1-160000.8.18.14.1-160000.8.1
openSUSE:Tumbleweedcurlbefore 8.21.0-1.18.21.0-1.1
Red Hat:hummingbird:1curlbefore 0:8.21.0-0.1.hum10:8.21.0-0.1.hum1
Red Hat:hummingbird:1libcurlbefore 0:8.21.0-0.1.hum10:8.21.0-0.1.hum1
Red Hat:hummingbird:1libcurl-develbefore 0:8.21.0-0.1.hum10:8.21.0-0.1.hum1
Red Hat:hummingbird:1libcurl-minimalbefore 0:8.21.0-0.1.hum10:8.21.0-0.1.hum1
SUSE:Linux Enterprise Installer Updates 15 SP4curlbefore 8.14.1-150400.5.86.18.14.1-150400.5.86.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7curlbefore 8.14.1-150700.7.20.18.14.1-150700.7.20.1
SUSE:Linux Enterprise Server 15 SP6-LTSScurlbefore 8.14.1-150600.4.46.18.14.1-150600.4.46.1
SUSE:Linux Enterprise Server 16.0curl-minibefore 8.14.1-160000.8.18.14.1-160000.8.1
SUSE:Linux Micro 6.0curlbefore 8.14.1-7.18.14.1-7.1
SUSE:Linux Micro 6.1curlbefore 8.14.1-slfo.1.1_8.18.14.1-slfo.1.1_8.1
SUSE:Linux Micro 6.2curlbefore 8.14.1-160000.8.18.14.1-160000.8.1

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-2026-8932Jul 3, 2026 · incomplete mTLS config matching in conn reuse
    30Monitor
  • ← EarlierCVE-2026-9079Jul 3, 2026 · stale proxy password leak
    39Monitor
  • Later →CVE-2026-9545Jul 3, 2026 · exposing HTTP/3 early data
    30Monitor

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 curl5ab34cba42e4ee4282fe8bab43f311d51b9bf9bdVendor (CNA)
curl curl8.14.2Vendor (CNA)
curl curl8.16.1Vendor (CNA)
curl curl8.20.1Vendor (CNA)
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:curl0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-devel0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-minimal0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:curl8.14.1-160000.8.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:curl-mini8.14.1-160000.8.1 · SUSE:Linux Enterprise Server 16.0Package 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.

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
low · data can be read
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

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

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

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