CVE-2026-1536VulnerabilityPublished 28 Jan 2026Updated 25 Mar 2026

CVE-2026-1536: Red Hat Enterprise Linux 10 · CRLF Injection

Affects Red Hat Enterprise Linux 10Source CVE Database V5

Not known to be exploited · CVSS 5.8 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

5.8Medium

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 27% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Changed
Confidentiality: None
Integrity: Low
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: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on 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 28 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 2026-10-26.

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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC 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

Affected software

Product	Affected	Fixed in
Red HatRed Hat Enterprise Linux 10	Affected–	Fixed in–
Red HatRed Hat Enterprise Linux 6	Affected–	Fixed in–
Red HatRed Hat Enterprise Linux 7	Affected–	Fixed in–
Red HatRed Hat Enterprise Linux 8	Affected–	Fixed in–
Red HatRed Hat Enterprise Linux 9	Affected–	Fixed in–

AI-suggested

To mitigate CVE-2026-1536, organizations should monitor Red Hat advisories and apply patches or updates to libsoup as soon as they become available. In the interim, administrators should audit applications and services that use libsoup for HTTP header construction, specifically those that handle Content-Disposition headers with user-controlled input. Implement strict input validation and sanitization to remove or encode CRLF sequences before including input in HTTP headers. Employ web application firewalls (WAFs) with rules to detect and block HTTP header injection attempts. Review and harden HTTP response handling logic to prevent response splitting. Additionally, consider isolating vulnerable services behind reverse proxies that can sanitize headers or reject malformed requests. Regularly update and patch all components of the web stack to reduce exposure to similar injection vulnerabilities. Finally, conduct security testing and code reviews focused on HTTP header injection vectors to proactively identify and remediate weaknesses.

Description

A flaw was found in libsoup. An attacker who can control the input for the Content-Disposition header can inject CRLF (Carriage Return Line Feed) sequences into the header value. These sequences are then interpreted verbatim when the HTTP request or response is constructed, allowing arbitrary HTTP headers to be injected. This vulnerability can lead to HTTP header injection or HTTP response splitting without requiring authentication or user interaction.

Impact

The primary impact of CVE-2026-1536 is the potential for HTTP header injection or HTTP response splitting, which can undermine the integrity of HTTP communications. Attackers can manipulate HTTP responses to inject arbitrary headers, potentially leading to web cache poisoning, cross-site scripting (XSS), or session fixation attacks. This can compromise the integrity of web applications and user sessions, potentially enabling further exploitation or data manipulation. Since the vulnerability does not affect confidentiality directly and does not impact availability, the main concern is integrity and trust in HTTP responses. Organizations running web services or applications on Red Hat Enterprise Linux 10 that use libsoup are at risk, especially if they process untrusted input in HTTP headers. The lack of authentication or user interaction requirements increases the attack surface, allowing remote attackers to exploit the flaw with relative ease. Although no exploits are currently known in the wild, the vulnerability could be leveraged in targeted attacks against web infrastructure, potentially affecting enterprise and cloud environments.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Mar 2026, 18:50 UTC

Technical details

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