Vulnerability-Lookup

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"
}

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
open-telemetry	opentelemetry-python	Affected: < 1.45.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-116694",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-28T14:34:44.239027Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-28T16:13:25.340Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "opentelemetry-python",
          "vendor": "open-telemetry",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.45.0"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-27T20:09:06.484Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/open-telemetry/opentelemetry-python/security/advisories/GHSA-f5m9-jfrj-jjj7",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/open-telemetry/opentelemetry-python/security/advisories/GHSA-f5m9-jfrj-jjj7"
        },
        {
          "name": "https://github.com/open-telemetry/opentelemetry-python/pull/5556",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/open-telemetry/opentelemetry-python/pull/5556"
        },
        {
          "name": "https://github.com/open-telemetry/opentelemetry-python/commit/65c4eeb87cd3815dc795d3b5485e9ea0d5affcc7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/open-telemetry/opentelemetry-python/commit/65c4eeb87cd3815dc795d3b5485e9ea0d5affcc7"
        },
        {
          "name": "https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.45.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.45.0"
        }
      ],
      "source": {
        "advisory": "GHSA-f5m9-jfrj-jjj7",
        "discovery": "UNKNOWN"
      },
      "title": "OpenTelemetry Python: Unbounded memory allocation in Jaeger baggage propagation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-116694",
    "datePublished": "2026-10-27T20:09:06.484Z",
    "dateReserved": "2026-10-26T20:00:59.830Z",
    "dateUpdated": "2026-10-28T16:13:25.340Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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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.
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GHSA-F5M9-JFRJ-JJJ7

Summary

Impact

Patches

Credit

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

Tags

Sightings

Nomenclature

Vulnerability timeline

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