Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.2, when an application…
Priority LOW 37CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-400.
Summary
Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.2, when an application invokes the totalSize method on an object reader, allows remote peers to cause a denial of service (CPU consumption) via a crafted small message, which triggers a "tight" for loop. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-2312.
Why it matters now
EPSS 0.01887 79th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:capnproto:capnproto:*:*:*:*:*:*:*:* | up to 0.4.1.0 | Vulnerable | capnproto |
| cpe:2.3:a:capnproto:capnproto:0.5.0.0:*:*:*:*:*:*:* | 0.5.0.0 | Vulnerable | capnproto |
| cpe:2.3:a:capnproto:capnproto:0.5.1.0:*:*:*:*:*:*:* | 0.5.1.0 | Vulnerable | capnproto |
| cpe:2.3:a:capnproto:capnproto:0.5.1.1:*:*:*:*:*:*:* | 0.5.1.1 | Vulnerable | capnproto |
- cpe:2.3:a:capnproto:capnproto:*:*:*:*:*:*:*:* Versions up to 0.4.1.0 Vulnerable ·capnproto
- cpe:2.3:a:capnproto:capnproto:0.5.0.0:*:*:*:*:*:*:* Versions 0.5.0.0 Vulnerable ·capnproto
- cpe:2.3:a:capnproto:capnproto:0.5.1.0:*:*:*:*:*:*:* Versions 0.5.1.0 Vulnerable ·capnproto
- cpe:2.3:a:capnproto:capnproto:0.5.1.1:*:*:*:*:*:*:* Versions 0.5.1.1 Vulnerable ·capnproto
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2015-2313
- 2026-10-03 Alias added: GHSA-8f67-f75m-fxfm
References
Advisory 4
- https://github.com/capnproto/capnproto/commit/80149744bdafa3ad4eedc83f8ab675e27baee868
- https://github.com/capnproto/capnproto/blob/master/security-advisories/2015-03-05-0-c%2B%2B-addl-cpu-amplification.md
- [oss-security] 20150317 Re: CVE Request: Cap'n Proto: Several issues
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780568
More Capnproto vulnerabilities
- TI-2015-02037 Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might… CVSS 3.0CRITICAL 9.8
- TI-2023-26094 Cap'n Proto WebSocket message can cause crash CVSS 3.1CRITICAL 9.8
- TI-2015-02036 Integer overflow in layout.c++ in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before… CVSS 3.1CRITICAL 9.1
- TI-2017-05503 Sandstorm Cap'n Proto before 0.5.3.1 allows remote crashes related to a compiler… CVSS 3.0HIGH 7.5
- TI-2015-02038 Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 allows remote peers to… CVSS 3.0HIGH 7.5
- TI-2026-24769 Cap'n Proto: Integer overflow in KJ-HTTP chunk size CVSS 4.0MEDIUM 6.3
Sources
- CVE-2015-2313 · CVE Program
- CVE-2015-2313 · NVD
- FIRST EPSS
- GHSA-8f67-f75m-fxfm · GitHub Advisory Database · CC BY 4.0
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