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Vulnerabilities

Vulnerability · CVE-2026-62303

Pistache is a high-performance REST toolkit written in C++.

Published Oct 30, 2026 · catalog updated Oct 31, 2026 · Pistache is a high-performance

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-62303. EPSS is 0.31%. Act only if a listed version of Pistache is a high-performance is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Pistache is a high-performance).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Advisory link
Affected products
Debian:12 pistache · Debian:13 pistache · Debian:14 pistache

Pistache is a high-performance REST toolkit written in C++. From 0.0.5 through 0.4.26, in uses 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. , and reach this normalization. Unauthenticated remote exploitation is conditional on a deployment allowing sufficiently long request paths, such as by increasing 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 pistache0.0.5+ds-3, 0.0.5+ds-4, 0.0.5+ds-5
  • Debian:13 pistache0.0.5+ds-5.1, 0.4.26+ds-2, 0.4.26+ds-3
  • Debian:14 pistache0.0.5+ds-5.1, 0.4.26+ds-2, 0.4.26+ds-3

How to fix CVE-2026-62303

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-62303. EPSS is 0.31%. Act only if a listed version of Pistache is a high-performance is installed.

Which versions are affected?

Compare what you have installed with 0.0.5+ds-3, 0.0.5+ds-4, 0.0.5+ds-5, 0.0.5+ds-5.1, 0.4.26+ds-2, 0.4.26+ds-3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 30, 2026 · OpenSSF OSV / OSV Scanner

    Detected

  2. Oct 31, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    The description or metadata changed.

  3. Oct 31, 2026 · Trivy Vulnerability DB

    Updated

    Pistache is a high-performance REST toolkit written in C++. From 0.0.5 through 0.4.26, in uses 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. , and reach this normalization. Unauthenticated remote exploitation is conditional on a deployment

Sources

  • CVE.orgVulnerability recordCVE-2026-62303

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-62303

    30-day exploitation probability 0.31%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-62303
    osv.dev
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-62303

    Pistache is a high-performance REST toolkit written in C++. From 0.0.5 through 0.4.26, in uses 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 a

    osv.dev

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 31, 2026
  • CVE.orgOct 31, 2026
  • Trivy Vulnerability DBOct 31, 2026
  • OpenSSF OSV / OSV ScannerOct 31, 2026