CVE-2023-32681: Unintended leak of Proxy-Authorization header in requests
Noroxi assessment
Priority: Monitor (action score 25/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 2.9% (FIRST EPSS); higher than 87.3% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. Special conditions such as timing or configuration are required.
- Fixed version: psf requests 2.31.0; cbl2 python-requests 2.27.1-6 on CBL Mariner 2.0 2.27.1-6; cm1 python-requests 2.22.0-3 on CBL Mariner 1.0 2.22.0-3.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to psf requests 2.31.0; cbl2 python-requests 2.27.1-6 on CBL Mariner 2.0 2.27.1-6; cm1 python-requests 2.22.0-3 on CBL Mariner 1.0 2.22.0-3 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
Requests is a HTTP library. Since Requests 2.3.0, Requests has been leaking Proxy-Authorization headers to destination servers when redirected to an HTTPS endpoint. This is a product of how we use `rebuild_proxies` to reattach the `Proxy-Authorization` header to requests. For HTTP connections sent through the tunnel, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the `Proxy-Authorization` header must be sent in the CONNECT request as the proxy has no visibility into the tunneled request. This results in Requests forwarding proxy credentials to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate sensitive information. This issue has been patched in version 2.31.0.
- BDU:2023-03874
- GHSA-j8r2-6x86-q33q
- ALSA-2023:4350
- ALSA-2023:4520
- ALSA-2023:7034
- ALSA-2023:7042
- ALSA-2023:7050
- DLA-3456-1
- openSUSE-SU-2024:12998-1
- openSUSE-SU-2025:14997-1
- openSUSE-SU-2026:12038-1
- PYSEC-2023-74
- RHSA-2023:4350
- RHSA-2023:4520
- RHSA-2023:4693
- RHSA-2023:6793
- RHSA-2023:7034
- RHSA-2023:7042
- RHSA-2023:7050
- RHSA-2024:0299
- Published
- May 26, 2023
- Updated
- Jun 17, 2026
- EPSS
- 2.9% · 87th percentile
- CWE
- CWE-200
Report tools
Action score
25
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.9%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 6.1
- CNA · GitHub_M
- 6.1
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
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.
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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 |
|---|---|---|
| python | requests | cpe:2.3:a:python:requests |
| 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 fedora37
- python requests2.3.0 and later · before 2.31.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
psf requests
- >= 2.3.0, < 2.31.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | babel | before 2.5.1-10.module_el8.6.0+2781+fed64c13 | 2.5.1-10.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python-nose-docs | before 1.3.7-31.module_el8.6.0+2781+fed64c13 | 1.3.7-31.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python-psycopg2-doc | before 2.7.5-8.module_el8.9.0+3640+8d3927b5 | 2.7.5-8.module_el8.9.0+3640+8d3927b5 |
| AlmaLinux:8 | python-sqlalchemy-doc | before 1.3.2-2.module_el8.6.0+2781+fed64c13 | 1.3.2-2.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2 | before 2.7.18-15.module_el8.9.0+3674+85657c95.alma.1 | 2.7.18-15.module_el8.9.0+3674+85657c95.alma.1 |
| AlmaLinux:8 | python2-attrs | before 17.4.0-10.module_el8.6.0+2781+fed64c13 | 17.4.0-10.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-babel | before 2.5.1-10.module_el8.6.0+2781+fed64c13 | 2.5.1-10.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-backports | before 1.0-16.module_el8.6.0+3162+01a09e5a | 1.0-16.module_el8.6.0+3162+01a09e5a |
| AlmaLinux:8 | python2-backports | before 1.0-16.module_el8.6.0+2781+fed64c13 | 1.0-16.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-backports-ssl_match_hostname | before 3.5.0.1-12.module_el8.6.0+2781+fed64c13 | 3.5.0.1-12.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-bson | before 3.7.0-1.module_el8.6.0+3162+01a09e5a | 3.7.0-1.module_el8.6.0+3162+01a09e5a |
| AlmaLinux:8 | python2-bson | before 3.7.0-1.module_el8.6.0+2781+fed64c13 | 3.7.0-1.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-chardet | before 3.0.4-10.module_el8.6.0+2781+fed64c13 | 3.0.4-10.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-coverage | before 4.5.1-5.module_el8.9.0+3640+8d3927b5 | 4.5.1-5.module_el8.9.0+3640+8d3927b5 |
| AlmaLinux:8 | python2-Cython | before 0.28.1-7.module_el8.6.0+2781+fed64c13 | 0.28.1-7.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-Cython | before 0.28.1-7.module_el8.6.0+3162+01a09e5a | 0.28.1-7.module_el8.6.0+3162+01a09e5a |
| AlmaLinux:8 | python2-debug | before 2.7.18-15.module_el8.9.0+3674+85657c95.alma.1 | 2.7.18-15.module_el8.9.0+3674+85657c95.alma.1 |
| AlmaLinux:8 | python2-devel | before 2.7.18-15.module_el8.9.0+3674+85657c95.alma.1 | 2.7.18-15.module_el8.9.0+3674+85657c95.alma.1 |
| AlmaLinux:8 | python2-dns | before 1.15.0-10.module_el8.6.0+2781+fed64c13 | 1.15.0-10.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-docs | before 2.7.16-2.module_el8.6.0+2781+fed64c13 | 2.7.16-2.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-docs-info | before 2.7.16-2.module_el8.6.0+2781+fed64c13 | 2.7.16-2.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-docutils | before 0.14-12.module_el8.6.0+2781+fed64c13 | 0.14-12.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-funcsigs | before 1.0.2-13.module_el8.6.0+2781+fed64c13 | 1.0.2-13.module_el8.6.0+2781+fed64c13 |
| AlmaLinux:8 | python2-idna | before 2.5-7.module_el8.6.0+2781+fed64c13 | 2.5-7.module_el8.6.0+2781+fed64c13 |
+96
Same product
python: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-18074The Requests package before 2.20.0 for Python sends an HTTP Authorization header to an http URI upon receiving a same-hostname https-to-http32Monitor
- CVE-2026-25645Requests has Insecure Temp File Reuse in its extract_zipped_paths() utility function22Monitor
- CVE-2014-1830Requests (aka python-requests) before 2.3.0 allows remote servers to obtain sensitive information by reading the Proxy-Authorization header 21Monitor
Published before and after this one in the same product
- ← EarlierCVE-2014-1829Oct 15, 2014 · Requests (aka python-requests) before 2.3.0 allows remote servers to obtain a netrc password by reading the Authorization header in a redire21Monitor
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 |
|---|---|---|
| psf requests | 2.31.0 · description | Vendor (CNA) |
| cbl2 python-requests 2.27.1-6 on CBL Mariner 2.0 | 2.27.1-6 · CBL-Mariner Releases | Microsoft (MSRC) |
| cm1 python-requests 2.22.0-3 on CBL Mariner 1.0 | 2.22.0-3 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:python3-requests | 2.25.1-7.el9_2 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:python3-requests+security | 2.25.1-7.el9_2 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:python3-requests+socks | 2.25.1-7.el9_2 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:python39 | 3.9.18-1.module_el8.9.0+3672+853baa42 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python39-attrs | 20.3.0-2.module_el8.6.0+2780+a40f65e1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python39-cffi | 1.14.3-2.module_el8.6.0+2780+a40f65e1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python39-chardet | 3.0.4-19.module_el8.6.0+2780+a40f65e1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python39-cryptography | 3.3.1-2.module_el8.6.0+2780+a40f65e1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python39-Cython | 0.29.21-5.module_el8.6.0+2780+a40f65e1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python39-debug | 3.9.18-1.module_el8.9.0+3672+853baa42 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python39-devel | 3.9.18-1.module_el8.9.0+3672+853baa42 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python39-PyMySQL | 0.10.1-2.module_el8.6.0+2780+a40f65e1 · AlmaLinux:8 | Package registry (OSV) |
| debian:requests | 2.31.0+dfsg-1 · Debian:13 | Package registry (OSV) |
| opensuse:oci-cli | 3.54.1-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:python-requests | 2.24.0-150300.3.3.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| PyPI:requests | 2.31.0 | Package registry (OSV) |
| red hat:automation-eda-controller | 0:1.0.1-1.el8ap · Red Hat:ansible_automation_platform:2.4::el8 | Package registry (OSV) |
| red hat:automation-eda-controller-server | 0:1.0.1-1.el8ap · Red Hat:ansible_automation_platform:2.4::el8 | Package registry (OSV) |
| red hat:automation-eda-controller-ui | 0:1.0.1-1.el8ap · Red Hat:ansible_automation_platform:2.4::el8 | Package registry (OSV) |
| red hat:python-cryptography | 0:38.0.4-2.el9ap · Red Hat:ansible_automation_platform_developer:2.4::el9 | Package registry (OSV) |
| red hat:python-requests | 0:2.25.1-7.el9_2 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:python3-requests | 0:2.25.1-7.el9_2 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:python3-requests+security | 0:2.25.1-7.el9_2 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:python3-requests+socks | 0:2.25.1-7.el9_2 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:python39-cryptography | 0:38.0.4-2.el8ap · Red Hat:ansible_automation_platform_developer:2.4::el8 | Package registry (OSV) |
| red hat:python39-cryptography-debuginfo | 0:38.0.4-2.el8ap · Red Hat:ansible_automation_platform_developer:2.4::el8 | Package registry (OSV) |
| red hat:python3x-cryptography | 0:38.0.4-2.el8ap · Red Hat:ansible_automation_platform_developer:2.4::el8 | Package registry (OSV) |
+16
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.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:4 | 2023-07-22 |
| Proof-of-concept repository on GitHub | stars:0 | 2026-10-21 |
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.
- Published
- First PoC+56 d
- TodayNov 10, 2026+1264 d
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.
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-23-0499 · Sep 7, 2023(Multicluster Engine Güvenlik Zafiyeti)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-200 · Exposure of Sensitive Information to an Unauthorized ActorCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
nvd-primary
Root cause
The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.
The bug in code
The whole CWE-200 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
{
"permissions": ["tabs", "<all_urls>"],
"background": { "service_worker": "analytics.js" }
}Fixed
{
"permissions": ["activeTab"],
"host_permissions": ["https://yildiz.example/*"]
}Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- ExcavationCAPEC-116likelihood: High · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- FootprintingCAPEC-169likelihood: High · Very Low
- Exploiting Trust in ClientCAPEC-22likelihood: High · High
- FingerprintingCAPEC-224likelihood: High · Very Low
- ICMP Echo Request PingCAPEC-285likelihood: Medium · Low
- TCP SYN ScanCAPEC-287Low
- Enumerate Mail Exchange (MX) RecordsCAPEC-290Low
ATT&CK techniques
- System Service DiscoveryT1007
- System Network Configuration DiscoveryT1016
- Remote System DiscoveryT1018
- System Owner/User DiscoveryT1033
- Masquerading: Match Legitimate Name or LocationT1036.005
- Network Service ScanningT1046
- System Network Connections DiscoveryT1049
- Process DiscoveryT1057
- Permission Groups DiscoveryT1069
- System Information DiscoveryT1082
- File and Directory DiscoveryT1083
- Account DiscoveryT1087
- Multi-Factor Authentication InterceptionT1111
- Peripheral Device DiscoveryT1120
- System Time DiscoveryT1124
- Access Token Manipulation:Token Impersonation/TheftT1134.001
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- github.com/psf/requests/releases/tag/v2.31.0
- github.com/psf/requests/security/advisories/GHSA-j8r2-6x86-q33q
- lists.debian.org/debian-lts-announce/2023/06/msg00018.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AW7HNFGYP44RT3DUDQXG2QT3OEV2PJ7Y/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KOYASTZDGQG2BWLSNBPL3TQRL2G7QYNZ/
- security.gentoo.org/glsa/202309-08
Vendor advisories and official records. Exploit/PoC links are deliberately left out.