170 lines
7.8 KiB
JSON
170 lines
7.8 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-77803",
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"assignerOrgId": "f9fea0b6-671e-4eea-8fde-31911902ae05",
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"state": "PUBLISHED",
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"assignerShortName": "ProgressSoftware",
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"dateReserved": "2026-08-21T13:37:32.974Z",
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"datePublished": "2026-10-05T12:39:36.806Z",
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"dateUpdated": "2026-10-06T17:50:34.935Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "f9fea0b6-671e-4eea-8fde-31911902ae05",
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"shortName": "ProgressSoftware",
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"dateUpdated": "2026-10-05T12:39:36.806Z"
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},
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"title": "Front-end Desynchronization Vulnerability in Progress® Telerik® Fiddler® Classic",
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"cweId": "CWE-444",
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"description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')",
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"type": "CWE"
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}
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]
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-33",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-33 HTTP Request Smuggling"
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}
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]
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}
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],
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"affected": [
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{
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"vendor": "Progress Software",
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"product": "Progress® Telerik® Fiddler® Classic",
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"platforms": [
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"Windows"
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],
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"versions": [
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{
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"status": "affected",
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"version": "1.0.0",
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"lessThan": "6.0.20262.10021",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unaffected"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "In Progress® Telerik® Fiddler® Classic for Windows, versions prior to v6.0.20262.10021, front-end request desynchronization is possible in the proxy request forwarding component. A request that contains both a Content-Length and a Transfer-Encoding header is forwarded with both headers present, while Fiddler frames the body using Transfer-Encoding only. The remaining bytes on the reused client connection are then parsed as a separate pipelined request, so a local threat actor with low privileges can cause a single malformed request to be split into two requests forwarded to the origin server and receive an additional smuggled response, without requiring a vulnerable server.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "In Progress® Telerik® Fiddler® Classic for Windows, versions prior to v6.0.20262.10021, front-end request desynchronization is possible in the proxy request forwarding component. A request that contains both a Content-Length and a Transfer-Encoding header is forwarded with both headers present, while Fiddler frames the body using Transfer-Encoding only. The remaining bytes on the reused client connection are then parsed as a separate pipelined request, so a local threat actor with low privileges can cause a single malformed request to be split into two requests forwarded to the origin server and receive an additional smuggled response, without requiring a vulnerable server."
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}
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]
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}
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],
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"references": [
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{
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"url": "https://docs.telerik.com/fiddler/knowledge-base/kb-security-front-end-desynchronization-cve-2026-77803",
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"tags": [
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"vendor-advisory"
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]
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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],
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"cvssV3_1": {
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"version": "3.1",
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"attackVector": "LOCAL",
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"attackComplexity": "HIGH",
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"privilegesRequired": "LOW",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "LOW",
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"integrityImpact": "LOW",
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"availabilityImpact": "NONE",
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"baseSeverity": "LOW",
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"baseScore": 3.6,
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"
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}
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}
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],
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"workarounds": [
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{
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"lang": "en",
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"value": "Disable client connection reuse in Fiddler Classic: open Tools > Options > Connections and uncheck the \"Reuse client connections\" checkbox. Disabling client pipe reuse prevents the excess data of a malformed request from being parsed as a pipelined request.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "<div>Disable client connection reuse in Fiddler Classic: open <b>Tools > Options > Connections</b> and uncheck the <b>\"Reuse client connections\"</b> checkbox. Disabling client pipe reuse prevents the excess data of a malformed request from being parsed as a pipelined request.</div>"
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}
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]
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "NATO Cyber Security Centre (NCSC)",
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"type": "finder"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"x_generator": {
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"engine": "Vulnogram 0.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-10-06T17:50:20.748709Z",
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"id": "CVE-2026-77803",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-06T17:50:34.935Z"
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}
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}
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]
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}
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} |