CVE-2023-46218: This flaw allows a malicious HTTP server to set "super cookies" in curl that are then passed back to more origins than what is otherwise all
Noroxi assessment
Priority: Monitor (action score 27/100)
- 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: 1.6% (FIRST EPSS); higher than 77.1% of all records.
- 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: Azure Linux 3.0 ARM 3.29.6-1, 8.0.40-1; Azure Linux 3.0 x64 3.29.6-1, 8.0.40-1; CBL Mariner 2.0 ARM 8.0.35-2, 8.5.0-1.
Low priority for now. Upgrade to Azure Linux 3.0 ARM 3.29.6-1, 8.0.40-1; Azure Linux 3.0 x64 3.29.6-1, 8.0.40-1; CBL Mariner 2.0 ARM 8.0.35-2, 8.5.0-1 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
This flaw allows a malicious HTTP server to set "super cookies" in curl that are then passed back to more origins than what is otherwise allowed or possible. This allows a site to set cookies that then would get sent to different and unrelated sites and domains. It could do this by exploiting a mixed case flaw in curl's function that verifies a given cookie domain against the Public Suffix List (PSL). For example a cookie could be set with `domain=co.UK` when the URL used a lower case hostname `curl.co.uk`, even though `co.uk` is listed as a PSL domain.
- Published
- Dec 6, 2023
- Updated
- Jul 14, 2026
- EPSS
- 1.6% · 77th percentile
- CWE
- CWE-178
Report tools
Action score
27
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 1.6%
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.
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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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| haxx | curl | cpe:2.3:a:haxx:curl |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora39
- haxx curl7.46.0 and later · up to 8.4.0 inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.
curl curl
- 8.4.0 and later · up to and including 8.4.0affected · semver
- 7.46.0 and later · before 7.46.0not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | curl | before 7.61.1-33.el8_9.5 | 7.61.1-33.el8_9.5 |
| AlmaLinux:8 | libcurl | before 7.61.1-33.el8_9.5 | 7.61.1-33.el8_9.5 |
| AlmaLinux:8 | libcurl-devel | before 7.61.1-33.el8_9.5 | 7.61.1-33.el8_9.5 |
| AlmaLinux:8 | libcurl-minimal | before 7.61.1-33.el8_9.5 | 7.61.1-33.el8_9.5 |
| AlmaLinux:9 | curl | before 7.76.1-26.el9_3.3 | 7.76.1-26.el9_3.3 |
| AlmaLinux:9 | curl-minimal | before 7.76.1-26.el9_3.3 | 7.76.1-26.el9_3.3 |
| AlmaLinux:9 | libcurl | before 7.76.1-26.el9_3.3 | 7.76.1-26.el9_3.3 |
| AlmaLinux:9 | libcurl-devel | before 7.76.1-26.el9_3.3 | 7.76.1-26.el9_3.3 |
| AlmaLinux:9 | libcurl-minimal | before 7.76.1-26.el9_3.3 | 7.76.1-26.el9_3.3 |
| Alpine:v3.15 | curl | from 7.46.0 · before 8.5.0-r0 | 8.5.0-r0 |
| Debian:10 | curl | before 7.64.0-4+deb10u8 | 7.64.0-4+deb10u8 |
| Debian:11 | curl | before 7.74.0-1.3+deb11u11 | 7.74.0-1.3+deb11u11 |
| Debian:12 | curl | before 7.88.1-10+deb12u5 | 7.88.1-10+deb12u5 |
| Debian:13 | curl | before 8.5.0-1 | 8.5.0-1 |
| openSUSE:Leap Micro 5.3 | curl | before 8.0.1-150400.5.36.1 | 8.0.1-150400.5.36.1 |
| openSUSE:Tumbleweed | curl | before 8.5.0-1.1 | 8.5.0-1.1 |
| Red Hat:enterprise_linux:8::baseos | curl | before 0:7.61.1-33.el8_9.5 | 0:7.61.1-33.el8_9.5 |
| Red Hat:enterprise_linux:8::baseos | curl-debuginfo | before 0:7.61.1-33.el8_9.5 | 0:7.61.1-33.el8_9.5 |
| Red Hat:enterprise_linux:8::baseos | curl-debugsource | before 0:7.61.1-33.el8_9.5 | 0:7.61.1-33.el8_9.5 |
| Red Hat:enterprise_linux:8::baseos | curl-minimal-debuginfo | before 0:7.61.1-33.el8_9.5 | 0:7.61.1-33.el8_9.5 |
| Red Hat:enterprise_linux:8::baseos | libcurl | before 0:7.61.1-33.el8_9.5 | 0:7.61.1-33.el8_9.5 |
| Red Hat:enterprise_linux:8::baseos | libcurl-debuginfo | before 0:7.61.1-33.el8_9.5 | 0:7.61.1-33.el8_9.5 |
| Red Hat:enterprise_linux:8::baseos | libcurl-devel | before 0:7.61.1-33.el8_9.5 | 0:7.61.1-33.el8_9.5 |
| Red Hat:enterprise_linux:8::baseos | libcurl-minimal | before 0:7.61.1-33.el8_9.5 | 0:7.61.1-33.el8_9.5 |
+96
Same product
haxx: all recordsOther 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 t51Plan
- 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-leak45Plan
Published before and after this one in the same product
- ← EarlierCVE-2023-28322May 26, 2023 · An information disclosure vulnerability exists in curl <v8.1.0 when doing HTTP(S) transfers, libcurl might erroneously use the read callback15Monitor
- ← EarlierCVE-2020-19909Aug 22, 2023 · Integer overflow vulnerability in tool_operate.c in curl 7.65.2 via a large value as the retry delay.13Monitor
- Later →CVE-2023-46219Dec 11, 2023 · When saving HSTS data to an excessively long file name, curl could end up
removing all contents, making subsequent requests using that file 21Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Azure Linux 3.0 ARM | 3.29.6-1 · cmake | Microsoft (MSRC) |
| Azure Linux 3.0 ARM | 8.0.40-1 · mysql | Microsoft (MSRC) |
| Azure Linux 3.0 x64 | 3.29.6-1 · cmake | Microsoft (MSRC) |
| Azure Linux 3.0 x64 | 8.0.40-1 · mysql | Microsoft (MSRC) |
| CBL Mariner 2.0 ARM | 8.0.35-2 · mysql | Microsoft (MSRC) |
| CBL Mariner 2.0 ARM | 8.5.0-1 · curl | Microsoft (MSRC) |
| CBL Mariner 2.0 x64 | 8.0.35-2 · mysql | Microsoft (MSRC) |
| CBL Mariner 2.0 x64 | 8.5.0-1 · curl | Microsoft (MSRC) |
| almalinux:curl | 7.76.1-26.el9_3.3 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:curl-minimal | 7.76.1-26.el9_3.3 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:libcurl | 7.76.1-26.el9_3.3 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:libcurl-devel | 7.76.1-26.el9_3.3 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:libcurl-minimal | 7.76.1-26.el9_3.3 · AlmaLinux:9 | Package registry (OSV) |
| alpine:curl | 8.5.0-r0 · Alpine:v3.15 | Package registry (OSV) |
| debian:curl | 7.88.1-10+deb12u5 · Debian:12 | Package registry (OSV) |
| opensuse:curl | 8.0.1-150400.5.36.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| red hat:curl | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| red hat:curl-debuginfo | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| red hat:curl-debugsource | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| red hat:curl-minimal | 0:7.76.1-14.el9_0.11 · Red Hat:rhel_eus:9.0::baseos | Package registry (OSV) |
| red hat:curl-minimal-debuginfo | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| red hat:jbcs-httpd24-openssl | 1:1.1.1k-17.el7jbcs · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:jbcs-httpd24-openssl-debuginfo | 1:1.1.1k-17.el7jbcs · Red Hat:jboss_core_services:1::el7 | Package registry (OSV) |
| red hat:libcurl | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| red hat:libcurl-debuginfo | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| red hat:libcurl-devel | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| red hat:libcurl-minimal | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| red hat:libcurl-minimal-debuginfo | 0:7.61.1-22.el8_6.12 · Red Hat:rhel_eus:8.6::baseos | Package registry (OSV) |
| rocky linux:curl | 0:7.61.1-33.el8_9.5 · Rocky Linux:8 | Package registry (OSV) |
| suse:curl | 7.60.0-150000.56.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | Package registry (OSV) |
+1
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.
No history yet (it accumulates with the daily EPSS job).
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 researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
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
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-178 · Improper Handling of Case SensitivityCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
nvd-primary
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (9 more)Show less
- lists.debian.org/debian-lts-announce/2023/12/msg00015.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3ZX3VW67N4ACRAPMV2QS2LVYGD7H2MVE/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UOGXU25FMMT2X6UUITQ7EZZYMJ42YWWD/
- security.netapp.com/advisory/ntap-20240125-0007/
- www.debian.org/security/2023/dsa-5587
- cert-portal.siemens.com/productcert/html/ssa-082556.html
- cert-portal.siemens.com/productcert/html/ssa-093430.html
- cert-portal.siemens.com/productcert/html/ssa-202008.html
- cert-portal.siemens.com/productcert/html/ssa-331112.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.