Vulnerability · CVE-2026-3634
A flaw was found in libsoup.
Published Mar 17, 2026 · catalog updated Jun 17, 2026 · A flaw was found
Check if you run it
No confirmed exploitation is on record for CVE-2026-3634. EPSS is 0.32%. Act only if a listed version of A flaw was found is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium6.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.32%
- Remediation
- Advisory link
- Affected products
- cpe gnome/libsoup · cpe redhat/enterprise linux
A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe gnome/libsoupversion unspecified
- cpe redhat/enterprise linux10.0
- cpe redhat/enterprise linux6.0
- cpe redhat/enterprise linux7.0
- cpe redhat/enterprise linux8.0
- cpe redhat/enterprise linux9.0
How to fix CVE-2026-3634
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-3634. EPSS is 0.32%. Act only if a listed version of A flaw was found is installed.
Which versions are affected?
Compare what you have installed with redhat/enterprise linux 10.0; redhat/enterprise linux 6.0; redhat/enterprise linux 7.0; redhat/enterprise linux 8.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-93. EPSS 0.32%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 17, 2026 · NIST NVD
Detected
A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.
Jun 17, 2026 · NIST NVD
Updated
A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.
Sources
- CVE.orgVulnerability recordCVE-2026-3634
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-3634
30-day exploitation probability 0.3%
first.org - NIST NVDVulnerability recordCVE-2026-3634
A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the function. This vulnerability allows for th
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.