CVE-2024-37891VulnerabilityPublished 19 Nov 2024Updated 5 Nov 2026

Red Hat Security Advisory: python3.12-urllib3 security update

Affects Red Hat python3.12-urllib3Source GCVE Database

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Authoritative record:CVE-2024-37891· Medium 4.4

Not known to be exploited · CVSS 4.4 Medium.

Data as of 5 Nov 2026, 17:18 UTC

CVSS 3.1 base score

4.4Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (GitHub_M)	CVSS 3.1	4.4

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

Attack Vector: Network
Attack Complexity: High
Privileges Required: High
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Jun 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

Red Hat has released an official security update for python3.12-urllib3 in Red Hat Enterprise Linux 9.4 Extended Update Support that fixes this vulnerability. Users should apply the update as described in the Red Hat advisory RHSA-2024:9923 and the associated article at https://access.redhat.com/articles/11258 to remediate the issue. No additional mitigation steps are indicated beyond applying the official patch.

Description

A moderate severity vulnerability (CVE-2024-37891) in urllib3, a Python HTTP client library, allows the proxy-authorization request header to persist during cross-origin redirects. This behavior can lead to unintended disclosure of proxy credentials when redirects occur across different origins. The issue affects Red Hat Enterprise Linux 9.4 Extended Update Support versions of python3.12-urllib3. A security update is available from Red Hat to address this vulnerability.

Impact

If exploited, the vulnerability could lead to the unintended disclosure of proxy authorization headers during cross-origin redirects, potentially exposing sensitive proxy credentials. This could allow an attacker to gain unauthorized access to proxy services or intercept sensitive information. However, no known exploits in the wild have been reported, and the overall security impact is rated as moderate by Red Hat.

Summary

The vulnerability CVE-2024-37891 in urllib3 involves the proxy-authorization request header not being stripped during cross-origin HTTP redirects. This can cause sensitive proxy authorization credentials to be sent to unintended destinations, potentially exposing them to attackers. The flaw is addressed in a security update provided by Red Hat for python3.12-urllib3 on Red Hat Enterprise Linux 9.4 Extended Update Support. The advisory rates the impact as moderate and references the Red Hat security advisory RHSA-2024:9923 for details and remediation instructions.

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 5 Nov 2026, 17:18 UTC

WeaknessesCWE-669

Technical details

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