Vulnerability-Lookup

CVE-2026-116694 (GCVE-0-2026-116694)

Vulnerability from cvelistv5 – Published: 2026-10-27 20:09 – Updated: 2026-10-28 16:13

Title

OpenTelemetry Python: Unbounded memory allocation in Jaeger baggage propagation

Summary

OpenTelemetry Python provides the Python API and SDK for OpenTelemetry. Prior to 1.45.0, JaegerPropagator.extract() in opentelemetry-propagator-jaeger processes inbound uberctx-* baggage values without entry, per-entry byte, or total-byte limits. Services that enable the optional Jaeger propagator can perform unnecessary CPU work and short-lived heap allocations when an untrusted carrier supplies numerous or oversized values, contributing to denial of service when transport-level limits do not constrain the input. Common default Python HTTP server limits reduce the practical impact, while custom getters, non-HTTP transports, or raised header limits increase exposure. This issue is fixed in version 1.45.0.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-28 14:34 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7926 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/open-telemetry/opentelemetry-p…	x_refsource_CONFIRM
https://github.com/open-telemetry/opentelemetry-p…	x_refsource_MISC
https://github.com/open-telemetry/opentelemetry-p…	x_refsource_MISC
https://github.com/open-telemetry/opentelemetry-p…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
open-telemetry	opentelemetry-python	Affected: < 1.45.0	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-116694

Vulnerability from fkie_nvd - Published: 2026-10-27 21:18 - Updated: 2026-10-27 21:18

Severity

6.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/open-telemetry/opentelemetry-python/commit/65c4eeb87cd3815dc795d3b5485e9ea0d5affcc7
	security-advisories@github.com	https://github.com/open-telemetry/opentelemetry-python/pull/5556
	security-advisories@github.com	https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.45.0
	security-advisories@github.com	https://github.com/open-telemetry/opentelemetry-python/security/advisories/GHSA-f5m9-jfrj-jjj7

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "opentelemetry-python",
          "vendor": "open-telemetry",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.45.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenTelemetry Python provides the Python API and SDK for OpenTelemetry. Prior to 1.45.0, JaegerPropagator.extract() in opentelemetry-propagator-jaeger processes inbound uberctx-* baggage values without entry, per-entry byte, or total-byte limits. Services that enable the optional Jaeger propagator can perform unnecessary CPU work and short-lived heap allocations when an untrusted carrier supplies numerous or oversized values, contributing to denial of service when transport-level limits do not constrain the input. Common default Python HTTP server limits reduce the practical impact, while custom getters, non-HTTP transports, or raised header limits increase exposure. This issue is fixed in version 1.45.0."
    }
  ],
  "id": "CVE-2026-116694",
  "lastModified": "2026-10-27T21:18:05.323",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
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          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
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        "type": "Secondary"
      }
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  },
  "published": "2026-10-27T21:18:05.323",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-telemetry/opentelemetry-python/commit/65c4eeb87cd3815dc795d3b5485e9ea0d5affcc7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-telemetry/opentelemetry-python/pull/5556"
    },
    {
      "source": "security-advisories@github.com",
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    },
    {
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    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-F5M9-JFRJ-JJJ7

Vulnerability from github – Published: 2026-10-27 21:06 – Updated: 2026-10-27 21:06

Summary

OpenTelemetry Python: Unbounded memory allocation in Jaeger baggage propagation

Details

Summary

JaegerPropagator.extract() in opentelemetry-propagator-jaeger did not enforce limits when extracting inbound uberctx-* baggage headers. Attacker-controlled baggage could cause unnecessary CPU work and short-lived heap allocations while processing more data than the propagator should accept.

Impact

Services that enable the optional Jaeger propagator and accept untrusted inbound propagation headers may experience increased per-request resource usage. This can contribute to denial-of-service risk when transport-level limits are absent or configured above the baggage limits.

The practical impact for most Python web deployments is limited. The package must be installed separately, and the Jaeger propagator is not enabled by the default OpenTelemetry Python configuration.

Common Python web servers also constrain request headers before they reach the propagator:

Gunicorn allows a maximum of 100 request-header fields and 8,190 bytes per field by default.
Uvicorn’s h11 implementation limits its incomplete-event buffer to 16,384 bytes by default.

The risk is higher for non-HTTP transports, custom TextMapGetter implementations, or deployments where server and gateway limits have been increased or disabled.

The impact is limited to availability. This issue does not expose or modify telemetry data and does not allow code execution.

Patches

Versions of opentelemetry-propagator-jaeger earlier than 1.45.0 are affected.

Upgrade opentelemetry-propagator-jaeger to version 1.45.0 or later.

Version 1.45.0 limits extraction to 180 entries and 8,192 total bytes and skips entries larger than 4,096 bytes.

Credit

tonghuaroot

Severity

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.44.0"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "opentelemetry-propagator-jaeger"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.45.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-116694"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-27T21:06:54Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\n`JaegerPropagator.extract()` in `opentelemetry-propagator-jaeger` did not enforce limits when extracting inbound `uberctx-*` baggage headers. Attacker-controlled baggage could cause unnecessary CPU work and short-lived heap allocations while processing more data than the propagator should accept.\n\n## Impact\n\nServices that enable the optional Jaeger propagator and accept untrusted inbound propagation headers may experience increased per-request resource usage. This can contribute to denial-of-service risk when transport-level limits are absent or configured above the baggage limits.\n\nThe practical impact for most Python web deployments is limited. The package must be installed separately, and the Jaeger propagator is not enabled by the default OpenTelemetry Python configuration.\n\nCommon Python web servers also constrain request headers before they reach the propagator:\n\n- Gunicorn allows a maximum of 100 request-header fields and 8,190 bytes per field by default.\n- Uvicorn\u2019s h11 implementation limits its incomplete-event buffer to 16,384 bytes by default.\n\nThe risk is higher for non-HTTP transports, custom `TextMapGetter` implementations, or deployments where server and gateway limits have been increased or disabled.\n\nThe impact is limited to availability. This issue does not expose or modify telemetry data and does not allow code execution.\n\n## Patches\n\nVersions of `opentelemetry-propagator-jaeger` earlier than `1.45.0` are affected.\n\nUpgrade `opentelemetry-propagator-jaeger` to version `1.45.0` or later.\n\nVersion `1.45.0` limits extraction to 180 entries and 8,192 total bytes and skips entries larger than 4,096 bytes.\n\n## Credit\n\ntonghuaroot",
  "id": "GHSA-f5m9-jfrj-jjj7",
  "modified": "2026-10-27T21:06:54Z",
  "published": "2026-10-27T21:06:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-telemetry/opentelemetry-python/security/advisories/GHSA-f5m9-jfrj-jjj7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-telemetry/opentelemetry-python/pull/5556"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-telemetry/opentelemetry-python/commit/65c4eeb87cd3815dc795d3b5485e9ea0d5affcc7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/open-telemetry/opentelemetry-python"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.45.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenTelemetry Python: Unbounded memory allocation in Jaeger baggage propagation"
}

UBUNTU-CVE-2026-116694 (CVE-2026-116694)

Vulnerability from osv_ubuntu – Published: 2026-10-27 21:18 – Updated: 2026-10-27 21:18 – Source website

Details

Severity

6.3 (Medium)


                    
                      CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-116694	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-116694	REPORT
	https://github.com/open-telemetry/opentelemetry-p…	REPORT
	https://github.com/open-telemetry/opentelemetry-p…	REPORT
	https://github.com/open-telemetry/opentelemetry-p…	REPORT
	https://github.com/open-telemetry/opentelemetry-p…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-opentelemetry-api",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-configuration",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-otlp",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-otlp-proto-common",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-otlp-proto-grpc",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-otlp-proto-http",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-prometheus",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-zipkin-json",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-zipkin-proto-http",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-opentracing-shim",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-propagator-b3",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-propagator-jaeger",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-proto",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-proto-json",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-sdk",
            "binary_version": "1.44.0-2"
          },
          {
            "binary_name": "python3-opentelemetry-semantic-conventions",
            "binary_version": "1.44.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "python-opentelemetry",
        "purl": "pkg:deb/ubuntu/python-opentelemetry@1.44.0-2?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.39.1-2",
        "1.42.1-1",
        "1.43.0-1",
        "1.44.0-1",
        "1.44.0-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-opentelemetry-api",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-otlp",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-otlp-proto-common",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-otlp-proto-grpc",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-otlp-proto-http",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-prometheus",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-zipkin-json",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-exporter-zipkin-proto-http",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-opentracing-shim",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-propagator-b3",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-propagator-jaeger",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-proto",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-sdk",
            "binary_version": "1.39.1-2"
          },
          {
            "binary_name": "python3-opentelemetry-semantic-conventions",
            "binary_version": "1.39.1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "python-opentelemetry",
        "purl": "pkg:deb/ubuntu/python-opentelemetry@1.39.1-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.38.0-1",
        "1.38.0-2",
        "1.39.1-1",
        "1.39.1-2"
      ]
    }
  ],
  "aliases": [],
  "details": "OpenTelemetry Python provides the Python API and SDK for OpenTelemetry. Prior to 1.45.0, JaegerPropagator.extract() in opentelemetry-propagator-jaeger processes inbound uberctx-* baggage values without entry, per-entry byte, or total-byte limits. Services that enable the optional Jaeger propagator can perform unnecessary CPU work and short-lived heap allocations when an untrusted carrier supplies numerous or oversized values, contributing to denial of service when transport-level limits do not constrain the input. Common default Python HTTP server limits reduce the practical impact, while custom getters, non-HTTP transports, or raised header limits increase exposure. This issue is fixed in version 1.45.0.",
  "id": "UBUNTU-CVE-2026-116694",
  "modified": "2026-10-27T21:18:00Z",
  "published": "2026-10-27T21:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-116694"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-116694"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/open-telemetry/opentelemetry-python/security/advisories/GHSA-f5m9-jfrj-jjj7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/open-telemetry/opentelemetry-python/pull/5556"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/open-telemetry/opentelemetry-python/commit/65c4eeb87cd3815dc795d3b5485e9ea0d5affcc7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.45.0"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-116694"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-116694 (GCVE-0-2026-116694)

FKIE_CVE-2026-116694

GHSA-F5M9-JFRJ-JJJ7

Summary

Impact

Patches

Credit

UBUNTU-CVE-2026-116694 (CVE-2026-116694)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour