CVE-2022-46149: Cap'n Proto vulnerable to out-of-bounds read due to logic error handling list-of-list.
Noroxi assessment
Priority: Monitor (action score 21/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.93% (FIRST EPSS); higher than 60.7% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
- Fixed version: capnp (crates.io) 0.13.7, 0.14.11, 0.15.2; capnproto (Debian:12) 0.9.2-2; rust-capnp (Debian:12) 0.14.11-1.1.
Low priority for now. Upgrade to capnp (crates.io) 0.13.7, 0.14.11, 0.15.2; capnproto (Debian:12) 0.9.2-2; rust-capnp (Debian:12) 0.14.11-1.1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Cap'n Proto is a data interchange format and remote procedure call (RPC) system. Cap'n Proro prior to versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3, as well as versions of Cap'n Proto's Rust implementation prior to 0.13.7, 0.14.11, and 0.15.2 are vulnerable to out-of-bounds read due to logic error handling list-of-list. This issue may lead someone to remotely segfault a peer by sending it a malicious message, if the victim performs certain actions on a list-of-pointer type. Exfiltration of memory is possible if the victim performs additional certain actions on a list-of-pointer type. To be vulnerable, an application must perform a specific sequence of actions, described in the GitHub Security Advisory. The bug is present in inlined code, therefore the fix will require rebuilding dependent applications. Cap'n Proto has C++ fixes available in versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3. The `capnp` Rust crate has fixes available in versions 0.13.7, 0.14.11, and 0.15.2.
- Published
- Nov 30, 2022
- Updated
- Jun 17, 2026
- EPSS
- 0.9% · 60th percentile
- CWE
- CWE-125
Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.9%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.4
- CNA · GitHub_M
- 5.4
- agree
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Running WordPress? Scan your site free with WP Lens
Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| capnproto | capnproto | cpe:2.3:a:capnproto:capnproto |
| capnproto | capnp | cpe:2.3:a:capnproto:capnp |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- capnproto capnp0.15.0 and later · before 0.15.2
- capnproto capnpbefore 0.13.7
- capnproto capnp0.14.0 and later · before 0.14.11
- capnproto capnprotobefore 0.7.1
- capnproto capnproto0.9.0 and later · before 0.9.2
- capnproto capnproto0.10.0 and later · before 0.10.3
- capnproto capnproto0.8.0
- fedoraproject fedora36
- fedoraproject fedora37
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
capnproto capnproto
- < 0.7.1, >= 0.8.0, < 0.8.1, >= 0.9.0, < 0.9.2, >= 0.10.0, < 0.10.3, >= 0.13.0, < 0.13.7, >= 0.14.0, < 0.14.11, >= 0.15.0, < 0.15.2affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| crates.io | capnp | from 0.0.0-0 · before 0.13.7 | 0.13.7 |
| crates.io | capnp | from 0.14.0 · before 0.14.11 | 0.14.11 |
| crates.io | capnp | from 0.14.0-0 · before 0.14.11 | 0.14.11 |
| crates.io | capnp | from 0.15.0 · before 0.15.2 | 0.15.2 |
| crates.io | capnp | from 0.15.0-0 · before 0.15.2 | 0.15.2 |
| crates.io | capnp | before 0.13.7 | 0.13.7 |
| Debian:12 | capnproto | before 0.9.2-2 | 0.9.2-2 |
| Debian:12 | rust-capnp | before 0.14.11-1.1 | 0.14.11-1.1 |
| openSUSE:Leap 15.4 | capnproto | before 0.9.1-150400.3.4.1 | 0.9.1-150400.3.4.1 |
| openSUSE:Tumbleweed | python-pycapnp | before 2.0.0-2.5 | 2.0.0-2.5 |
| Red Hat:openshift:4.12::el8 | conmon-rs | before 0:0.5.1-3.rhaos4.12.git.el8 | 0:0.5.1-3.rhaos4.12.git.el8 |
| Red Hat:openshift:4.12::el9 | conmon-rs | before 0:0.5.1-3.rhaos4.12.git.el9 | 0:0.5.1-3.rhaos4.12.git.el9 |
| SUSE:Linux Enterprise Module for Desktop Applications 15 SP4 | capnproto | before 0.9.1-150400.3.4.1 | 0.9.1-150400.3.4.1 |
Same product
capnproto: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-48230Cap'n Proto WebSocket message can cause crash40Plan
- CVE-2015-2311Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might allow remote peers to cause a denial of service or 40Plan
- CVE-2015-2310Integer overflow in layout.c++ in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 allows remote peers to cause a denial of ser37Monitor
Published before and after this one in the same product
- ← EarlierCVE-2015-2312Aug 9, 2017 · Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 allows remote peers to cause a denial of service (CPU and possibly general res31Monitor
- ← EarlierCVE-2015-2313Aug 9, 2017 · 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 31Monitor
- Later →CVE-2026-32239Mar 12, 2026 · Cap'n Proto has an integer overflow in KJ-HTTP25Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| crates.io:capnp | 0.13.7 | Package registry (OSV) |
| crates.io:capnp | 0.14.11 | Package registry (OSV) |
| crates.io:capnp | 0.15.2 | Package registry (OSV) |
| debian:capnproto | 0.9.2-2 · Debian:12 | Package registry (OSV) |
| debian:rust-capnp | 0.14.11-1.1 · Debian:12 | Package registry (OSV) |
| opensuse:capnproto | 0.9.1-150400.3.4.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:python-pycapnp | 2.0.0-2.5 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:conmon-rs | 0:0.5.1-3.rhaos4.12.git.el8 · Red Hat:openshift:4.12::el8 | Package registry (OSV) |
| suse:capnproto | 0.9.1-150400.3.4.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP4 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- none
- Availability
- low · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
- github.com/capnproto/capnproto/security/advisories/GHSA-qqff-4vw4-f6hx
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAHKLUMJAXJEV5BPBS5XXWBQ3ZTHGOLY/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PTS6TWD6K2NKXLEEFBPROQXMOFUTEYWY/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WKXM4JAFXLTXU5IQB3OUBQVCIICZWGYX/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZOCQQOPMVQOFUWBWAGVGN76OYAV3WXY4/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.