# CVE-2026-126050: apitrace 2.0 through 14.0 Heap Buffer Overflow via SnappyFile::flushReadCache()

Status: published. Published: 2026-11-10. Updated: 2026-11-10.

apitrace 2.0 through 14.0 contains a heap-based buffer overflow in SnappyFile::flushReadCache() that allows attackers to write past m_compressedCache via an oversized compressed chunk length. Attackers can supply a crafted .trace file whose 4-byte chunk length exceeds the fixed buffer size, corrupting heap memory when users dump, inspect, or replay it.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/apitrace/apitrace/commit/3890c5a448addfd75ccbe1bd09e3075de6fb3395

## Affected products and versions

- apitrace / apitrace (apitrace/apitrace): ≥ 2.0; ≤ 14.0 (affected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.5 (high); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 8.5 (high); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-122

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/apitrace/apitrace/commit/3890c5a448addfd75ccbe1bd09e3075de6fb3395 (CNA: VulnCheck; patch)

- https://github.com/apitrace/apitrace/blob/18cfd388ac47a9e00978b34d6c20341f3e2cdb56/lib/trace/trace_file_snappy.cpp#L215-L235 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/apitrace-2.0-through-14.0-heap-buffer-overflow-via-snappyfile-flushreadcache (CNA: VulnCheck; third-party-advisory)

- https://github.com/apitrace/apitrace/blob/18cfd388ac47a9e00978b34d6c20341f3e2cdb56/lib/trace/trace_file_snappy.cpp#L215-L235 (disclosure@vulncheck.com)

- https://github.com/apitrace/apitrace/commit/3890c5a448addfd75ccbe1bd09e3075de6fb3395 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/apitrace-2.0-through-14.0-heap-buffer-overflow-via-snappyfile-flushreadcache (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126050; retrieved 2026-11-10; source updated 2026-11-10

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126050; retrieved 2026-11-10; source updated 2026-11-10

Revision: c450ca01eef471714b24350808ee9d60203ae00e426aa7a6e4c929c9c0cd6b1c

Canonical: https://y2.dev/cve/CVE-2026-126050

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.