Security readout for executives and security teams
Plain-English summary
Tinyproxy can misread differently capitalized Transfer-Encoding values, causing it and downstream systems to disagree about where HTTP requests begin and end. An unauthenticated remote attacker could exploit this parsing mismatch to disrupt service. The supplied CVSS assessment scores availability impact as high, without scored confidentiality or integrity impact.
Executive priority
Treat internet-facing or untrusted-client Tinyproxy deployments as high priority. Inventory immediately, reduce exposure, and apply vendor-confirmed remediation promptly. Trusted-only, isolated instances may rank lower, but the conflicting affected-version metadata requires verification rather than assuming safety.
Technical view
The is_chunked_transfer function reportedly uses strcmp against exact "chunked", contrary to RFC 7230's case-insensitivity requirement for transfer-coding names. Alternative capitalization can produce HTTP request desynchronization (CWE-444). CVSS 4.0 is 8.7: network-reachable, low complexity, no privileges or interaction, with high vulnerable-system availability impact.
Likely exposure
Potential exposure exists where Tinyproxy through 1.11.3 accepts HTTP traffic from untrusted clients, especially within proxy chains whose components parse request boundaries differently. The structured affected entry lists version "0" and defaults to unaffected, conflicting with the narrative description. Validate deployed versions against current CVE and upstream guidance.
Exploitation context
The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation. The upstream issue reportedly contains reproduction details, indicating public technical awareness but not observed attacks. No exploit prevalence, deployment data, or confirmed fixed release is supplied.
Researcher notes
The core claim is technically consistent with RFC 7230 and CWE-444, and the CVSS vector supports remote, unauthenticated exploitation with availability impact. However, the supplied structured affected metadata conflicts with the narrative version range. The bundle also lacks a confirmed fix, exploitation telemetry, and downstream parsing prerequisites.
Mitigation direction
- Inventory Tinyproxy deployments and prioritize versions reported as 1.11.3 or earlier.
- Check issue #604 and upstream release guidance for a vendor-confirmed fix or mitigation.
- Restrict untrusted network access to Tinyproxy until confirmed remediation is deployed.
- Consider temporarily disabling exposed instances where access cannot be adequately constrained.
Validation and detection
- Confirm deployed Tinyproxy versions against current upstream and CVE guidance.
- Map Tinyproxy listeners and determine whether untrusted clients can reach them.
- Review proxy chains for components that may interpret HTTP request boundaries differently.
- After remediation, verify transfer-coding recognition is case-insensitive in an isolated test environment.
- Recheck issue #604 for clarified affected versions and fixed-release information.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-444: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-31842 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
3 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——TuranSecAV:N/AC:L/Au:N/C:N/I:N/A:C106.9TuranSecCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6TuranSecVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base CVSS 2.0 score
7.8HighVector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Upstream issue report and reproduction detailsCVE reference, TuranSec · issue-tracking, technical-description
- Tinyproxy upstream projectCVE reference, TuranSec · product
- RFC 7230: transfer-coding names are case-insensitiveCVE reference, TuranSec · technical-description
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.