Search
Find a vulnerability
Search criteria
2 vulnerabilities by pistacheio
CVE-2026-62303 (GCVE-0-2026-62303)
Vulnerability from nvd – Published: 2026-10-30 18:58 – Updated: 2026-10-30 18:58
VLAI
EPSS
VEX
Title
Pistache: DoS via stack exhaustion in REST router path normalization (regex_replace on long slash runs)
Summary
Pistache is a high-performance REST toolkit written in C++. From 0.0.5 through 0.4.26, `SegmentTreeNode::sanitizeResource()` in `src/server/router.cc` uses `std::regex_replace()` with the `//+` expression to collapse consecutive slashes. With libstdc++, a path containing tens of thousands of consecutive slash characters can recurse deeply enough to exhaust the stack and crash the process. `Router::route()`, `Router::addRoute()` and `Router::removeRoute()` reach this normalization. Unauthenticated remote exploitation is conditional on a deployment allowing sufficiently long request paths, such as by increasing `Endpoint::Options::maxRequestSize()` above the default 4096-byte limit or forwarding long paths through a front end. Direct router API use is also affected when attacker-controlled route or resource strings reach the normalizer. Native builds reproduced a crash around 24,000 consecutive slashes, although the exact threshold depends on the stack and standard library; the demonstrated failure is stack exhaustion rather than uninitialized-memory use. A source fix replaces recursive regular-expression normalization with an iterative pass, but no containing repository release was verified as of time of publication.
Severity
5.9 (Medium)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/pistacheio/pistache/security/a… | x_refsource_CONFIRM |
| https://github.com/pistacheio/pistache/commit/935… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pistacheio | pistache |
Affected:
>= 0.0.5, <= 0.4.26
|
{
"containers": {
"cna": {
"affected": [
{
"product": "pistache",
"vendor": "pistacheio",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.0.5, \u003c= 0.4.26"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Pistache is a high-performance REST toolkit written in C++. From 0.0.5 through 0.4.26, `SegmentTreeNode::sanitizeResource()` in `src/server/router.cc` uses `std::regex_replace()` with the `//+` expression to collapse consecutive slashes. With libstdc++, a path containing tens of thousands of consecutive slash characters can recurse deeply enough to exhaust the stack and crash the process. `Router::route()`, `Router::addRoute()` and `Router::removeRoute()` reach this normalization. Unauthenticated remote exploitation is conditional on a deployment allowing sufficiently long request paths, such as by increasing `Endpoint::Options::maxRequestSize()` above the default 4096-byte limit or forwarding long paths through a front end. Direct router API use is also affected when attacker-controlled route or resource strings reach the normalizer. Native builds reproduced a crash around 24,000 consecutive slashes, although the exact threshold depends on the stack and standard library; the demonstrated failure is stack exhaustion rather than uninitialized-memory use. A source fix replaces recursive regular-expression normalization with an iterative pass, but no containing repository release was verified as of time of publication."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "CWE-400: Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-674",
"description": "CWE-674: Uncontrolled Recursion",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T18:58:10.308Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/pistacheio/pistache/security/advisories/GHSA-q474-pqcp-gqm5",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/pistacheio/pistache/security/advisories/GHSA-q474-pqcp-gqm5"
},
{
"name": "https://github.com/pistacheio/pistache/commit/935461352403696f3ca0dbb9a7de7d2609e7ce91",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pistacheio/pistache/commit/935461352403696f3ca0dbb9a7de7d2609e7ce91"
}
],
"source": {
"advisory": "GHSA-q474-pqcp-gqm5",
"discovery": "UNKNOWN"
},
"title": "Pistache: DoS via stack exhaustion in REST router path normalization (regex_replace on long slash runs)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-62303",
"datePublished": "2026-10-30T18:58:10.308Z",
"dateReserved": "2026-07-13T19:27:58.313Z",
"dateUpdated": "2026-10-30T18:58:10.308Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62303 (GCVE-0-2026-62303)
Vulnerability from cvelistv5 – Published: 2026-10-30 18:58 – Updated: 2026-10-30 18:58
VLAI
EPSS
VEX
Title
Pistache: DoS via stack exhaustion in REST router path normalization (regex_replace on long slash runs)
Summary
Pistache is a high-performance REST toolkit written in C++. From 0.0.5 through 0.4.26, `SegmentTreeNode::sanitizeResource()` in `src/server/router.cc` uses `std::regex_replace()` with the `//+` expression to collapse consecutive slashes. With libstdc++, a path containing tens of thousands of consecutive slash characters can recurse deeply enough to exhaust the stack and crash the process. `Router::route()`, `Router::addRoute()` and `Router::removeRoute()` reach this normalization. Unauthenticated remote exploitation is conditional on a deployment allowing sufficiently long request paths, such as by increasing `Endpoint::Options::maxRequestSize()` above the default 4096-byte limit or forwarding long paths through a front end. Direct router API use is also affected when attacker-controlled route or resource strings reach the normalizer. Native builds reproduced a crash around 24,000 consecutive slashes, although the exact threshold depends on the stack and standard library; the demonstrated failure is stack exhaustion rather than uninitialized-memory use. A source fix replaces recursive regular-expression normalization with an iterative pass, but no containing repository release was verified as of time of publication.
Severity
5.9 (Medium)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/pistacheio/pistache/security/a… | x_refsource_CONFIRM |
| https://github.com/pistacheio/pistache/commit/935… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pistacheio | pistache |
Affected:
>= 0.0.5, <= 0.4.26
|
{
"containers": {
"cna": {
"affected": [
{
"product": "pistache",
"vendor": "pistacheio",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.0.5, \u003c= 0.4.26"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Pistache is a high-performance REST toolkit written in C++. From 0.0.5 through 0.4.26, `SegmentTreeNode::sanitizeResource()` in `src/server/router.cc` uses `std::regex_replace()` with the `//+` expression to collapse consecutive slashes. With libstdc++, a path containing tens of thousands of consecutive slash characters can recurse deeply enough to exhaust the stack and crash the process. `Router::route()`, `Router::addRoute()` and `Router::removeRoute()` reach this normalization. Unauthenticated remote exploitation is conditional on a deployment allowing sufficiently long request paths, such as by increasing `Endpoint::Options::maxRequestSize()` above the default 4096-byte limit or forwarding long paths through a front end. Direct router API use is also affected when attacker-controlled route or resource strings reach the normalizer. Native builds reproduced a crash around 24,000 consecutive slashes, although the exact threshold depends on the stack and standard library; the demonstrated failure is stack exhaustion rather than uninitialized-memory use. A source fix replaces recursive regular-expression normalization with an iterative pass, but no containing repository release was verified as of time of publication."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "CWE-400: Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-674",
"description": "CWE-674: Uncontrolled Recursion",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T18:58:10.308Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/pistacheio/pistache/security/advisories/GHSA-q474-pqcp-gqm5",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/pistacheio/pistache/security/advisories/GHSA-q474-pqcp-gqm5"
},
{
"name": "https://github.com/pistacheio/pistache/commit/935461352403696f3ca0dbb9a7de7d2609e7ce91",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pistacheio/pistache/commit/935461352403696f3ca0dbb9a7de7d2609e7ce91"
}
],
"source": {
"advisory": "GHSA-q474-pqcp-gqm5",
"discovery": "UNKNOWN"
},
"title": "Pistache: DoS via stack exhaustion in REST router path normalization (regex_replace on long slash runs)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-62303",
"datePublished": "2026-10-30T18:58:10.308Z",
"dateReserved": "2026-07-13T19:27:58.313Z",
"dateUpdated": "2026-10-30T18:58:10.308Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}