Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.web.http.HTTPChannel.headerReceived rejects a NUL byte in an HTTP header value but accepts a bare carriage return or bare line feed. Because Twisted splits header lines only on CRLF, a hidden Content-Length header can remain folded into another value while a lenient front end treats the bare character as a line terminator. The resulting framing disagreement can smuggle a following request past front-end access controls, poison a shared connection or cache, and expose a later client to the wrong response. This issue is an incomplete-fix residual of earlier Twisted request-smuggling protections. This issue is fixed in version 26.10.0rc1.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:5215-1 advisory.

    - CVE-2026-83813: DNS spoofing in `twisted.names` due to missing source address validation (bsc#1287833).
    - CVE-2026-106454: ReDoS due to improper use of `re.compile()` in `wildcardToRegexp()` (bsc#1284420).
    - CVE-2026-115774: denial of service via negative size in IMAP search command (bsc#1287671).
    - CVE-2026-115775: denial of service via memory exhaustion in XML stream parser (bsc#1287675).
    - CVE-2026-115776: denial of service via unbounded IRC buffer (bsc#1287676).
    - CVE-2026-115778: denial of service via memory exhaustion during Telnet negotiation (bsc#1287678).
    - CVE-2026-115877: HTTP request smuggling due to improper header delimiter handling (bsc#1287848).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to
    26.10.0rc1, twisted.web.http.HTTPChannel.headerReceived rejects a NUL byte in an HTTP header value but
    accepts a bare carriage return or bare line feed. Because Twisted splits header lines only on CRLF, a
    hidden Content-Length header can remain folded into another value while a lenient front end treats the
    bare character as a line terminator. The resulting framing disagreement can smuggle a following request
    past front-end access controls, poison a shared connection or cache, and expose a later client to the
    wrong response. This issue is an incomplete-fix residual of earlier Twisted request-smuggling protections.
    This issue is fixed in version 26.10.0rc1. (CVE-2026-115877)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to     26.10.0rc1, twisted.web.http.HTTPChannel.headerReceived rejects a NUL byte in an HTTP header value but     accepts a bare carriage return or bare line feed. Because Twisted splits header lines only on CRLF, a     hidden Content-Length header can remain folded into another value while a lenient front end treats the     bare character as a line terminator. The resulting framing disagreement can smuggle a following request     past front-end access controls, poison a shared connection or cache, and expose a later client to the     wrong response. This issue is an incomplete-fix residual of earlier Twisted request-smuggling protections.
    This issue is fixed in version 26.10.0rc1. (CVE-2026-115877)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
381002	SUSE SLED15: python311-Twisted / python311-Twisted-all_non_platform / etc (SUSE-SU-2026:5215-1)	Nessus	SuSE Local Security Checks	Local	high
478044	Chainguard: synapse: security update to 1.164.1-r2	Tenable Cloud Security	Chainguard Local Security Checks	Local	medium
478044	Chainguard: synapse: security update to 1.164.1-r2	Tenable Self-Hosted Container Security	Chainguard Local Security Checks	Local	medium
477263	SCA: security update for Twisted (GHSA-q7qq-6mhp-9rc4)	Tenable Cloud Security	SCA Checks	Local	medium
477263	SCA: security update for Twisted (GHSA-q7qq-6mhp-9rc4)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
371726	Linux Distros Unpatched Vulnerability : CVE-2026-115877	Nessus	Misc.	Local	medium

Detections

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CVE-2026-115877

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Tenable Plugins

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medium

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medium