01 Record
CVE-2026-126360
OpenTelemetry Python: Denial of service through quadratic-time traceparent parsing in opentelemetry-api
MediumPUBLISHEDCNA: GitHub_M
CNA base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
02 Description
OpenTelemetry Python: Denial of service through quadratic-time traceparent parsing in opentelemetry-api
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- Not scored by EPSS
- EPSS percentile
- Not scored by EPSS
- NVD base score
- The NVD has published no score for this record
- NVD CVSS vector
- No NVD score to derive
- NVD analysis status
- Not recorded
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-11-12 22:24Z1 HR AGO
- Last updated
- 2026-11-12 22:24Z1 HR AGO
- Reserved
- 2026-11-10
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.3)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weaknesses
- CWE-1333Inefficient Regular Expression ComplexityBase
- Data version
- 5.2
- Document digest
- 3d8149923c39fef1b2dec1802e95fbbc6b713b5923372b7c7c969e7456e28275
05 Affected products
VendorProductVersionsPlatforms
06 References
- github.comhttps://github.com/open-telemetry/opentelemetry-python/security/advisories/GHSA-mf5v-w3w3-f6cg
- github.comhttps://github.com/open-telemetry/opentelemetry-python/pull/5818
- github.comhttps://github.com/open-telemetry/opentelemetry-python/pull/5856
- github.comhttps://github.com/open-telemetry/opentelemetry-python/commit/78123a2755c907c602e02352aebed4be86aa5350
- github.comhttps://github.com/open-telemetry/opentelemetry-python/commit/faa72dae511ae64a7bf8ca63eff9ad4387d0b939
- github.comhttps://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.45.2