UBUNTU-CVE-2026-62303

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Source

https://ubuntu.com/security/CVE-2026-62303

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62303.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-62303

Upstream

CVE-2026-62303

Published

2026-11-03T00:00:00Z

Modified

2026-11-04T03:30:33Z

Severity

5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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.

References

Affected packages

Ubuntu:24.04:LTS / pistache

Package

Name: pistache
Purl: pkg:deb/ubuntu/pistache?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.0.5+ds-5

0.0.5+ds-5.1

0.0.5+ds-5.1build1

0.0.5+ds-5.1build2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libpistache0t64",
            "binary_version": "0.0.5+ds-5.1build2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62303.json"

Ubuntu:26.04:LTS / pistache