Uncontrolled resource consumption in https://github.com/curl/curl
Priority MEDIUM 60CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-400.
Summary
A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for resolving host names, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.02658 85th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 1 advisoryRed Hat: 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | https://github.com/curl/curl | Fixed in 8.1.0 | — | No fix listed | CNA |
- https://github.com/curl/curl Vendor— Affected Fixed in 8.1.0 Fixed in — No fix listed CNA
CPE configurations NVD · 12
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* | before 8.1.0 | Vulnerable | Haxx |
| cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* | 11.0 to before 11.7.9; 12.0 to before 12.6.8; 13.0 to before 13.5 | Vulnerable | Apple |
| cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:ontap_antivirus_connector:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
- cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* Versions before 8.1.0 Vulnerable ·Haxx
- cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions 11.0 to before 11.7.9; 12.0 to before 12.6.8; 13.0 to before 13.5 Vulnerable ·Apple
- cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:ontap_antivirus_connector:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
Remediation
Red Hat 1 advisory
- RHSA-2023:4628 Released 2023-08-15 · Red Hat rating ModerateRed Hat JBoss Core Services Apache HTTP Server 2.4.57 security update
- Red Hat JBoss Core Services 2.4.57
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| .NET Core 3.1 on Red Hat Enterprise Linux | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
Not affected: 3 products
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2023-28320
- 2026-10-03 Alias added: GHSA-c8wj-435x-f2cc
- 2026-10-09 Fix available: RHSA-2023:4628 · Red Hat
References
Advisory 8
- https://security.netapp.com/advisory/ntap-20230609-0009/
- https://support.apple.com/kb/HT213843
- https://support.apple.com/kb/HT213844
- https://support.apple.com/kb/HT213845
- 20230725 APPLE-SA-2023-07-24-6 macOS Big Sur 11.7.9
- 20230725 APPLE-SA-2023-07-24-5 macOS Monterey 12.6.8
- 20230725 APPLE-SA-2023-07-24-4 macOS Ventura 13.5
- GLSA-202310-12
Sources
- CVE-2023-28320 · CVE Program
- CVE-2023-28320 · NVD
- FIRST EPSS
- GHSA-c8wj-435x-f2cc · GitHub Advisory Database · CC BY 4.0
- CVE-2023-28320 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences