CVE-2026-1760 | Libsoup: soupserver: denial of service via http request smuggling

A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of-service (DoS) conditions.

Published: 2026-02-02 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-1760 is rated Low Risk (21.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-1760

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-03 — 0.01% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-1760

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2026-1760

OS Trackers for CVE-2026-1760

vendor priority summary link
debian not yet assigned CVE-2026-1760 not yet assigned priority: Debian including 2 source packages (libsoup2.4, libsoup3), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5, resolved 2. https://security-tracker.debian.org/tracker/CVE-2026-1760
redhat medium — https://access.redhat.com/security/cve/CVE-2026-1760
suse high CVE-2026-1760 severity important: SUSE including 49 source package names (libsoup-2_4-1-2.62.2-5.37.1, libsoup-2_4-1-2.68.4-150200.4.33.1, …), 196 product×package rows across 40 product lines (Image SLE-Micro, Image SLE-Micro-Azure, … (40 product lines)): Fixed 192, First Fixed 4. https://www.suse.com/security/cve/CVE-2026-1760/
ubuntu medium CVE-2026-1760 medium priority: Ubuntu including 2 source packages (libsoup2.4, libsoup3), 11 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): needs-triage 10, released 1. https://ubuntu.com/security/CVE-2026-1760

Affected software / configurations for CVE-2026-1760

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-1760

cvelogic Threat Intelligence