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CVE-2026-97689

urllib3 is an HTTP client library for Python. From…

urllib3 is an HTTP client library for Python. From 1.10.3 until 2.8.0, the HTTPResponse.read_chunked and HTTPResponse.stream methods can allocate unbounded memory because the streaming chunk parser buffers the chunk-size field until newline or EOF without a length bound. The trigger is that a malicious server returns Transfer-Encoding: chunked followed by a very long run of bytes without a newline. The attack mechanism is that a malicious HTTP server sends a very long unterminated chunk-size line. The impact is that unbounded memory allocation can exhaust the client process. This issue is fixed in version 2.8.0.

Gravidade: High · CVSS 8.9CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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
Published: Sep 21, 2026, 7:00:15 PM UTC
Updated: Sep 29, 2026, 4:17:18 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.34% · Oct 27, 2026

Projects and upstream resources

[python-urllib3][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiansid	python-urllib3	`2.8.0-1`	FixedDistribution-reported fixed boundary	[CVE-2026-97689]
Debiansid	python-urllib3	`2.8.0-2`	Fixed	[CVE-2026-97689]
Debianforky	python-urllib3	`2.8.0-1`	FixedDistribution-reported fixed boundary	[CVE-2026-97689]
Debianforky	python-urllib3	`2.8.0-2`	Fixed	[CVE-2026-97689]

Showing 4 fix observations. All 11 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
PyPIRelease not reported	urllib3	`2.8.0`	UnknownSource applicability is not established	GHSA-VXQ7-64XX-V4GWPYSEC-2026-4177
Debianbookworm	python-urllib3	Not reported	AffectedDistribution reports no fix	[CVE-2026-97689]
Debianbookworm	python-urllib3	`1.26.12-1+deb12u4`	Affected	[CVE-2026-97689]
Debianbookworm-security	python-urllib3	`1.26.12-1+deb12u4`	Affected	[CVE-2026-97689]
Debianforky	python-urllib3	`2.8.0-1`	FixedDistribution-reported fixed boundary	[CVE-2026-97689]
Debianforky	python-urllib3	`2.8.0-2`	Fixed	[CVE-2026-97689]
Debiansid	python-urllib3	`2.8.0-1`	FixedDistribution-reported fixed boundary	[CVE-2026-97689]
Debiansid	python-urllib3	`2.8.0-2`	Fixed	[CVE-2026-97689]
Debiantrixie	python-urllib3	Not reported	AffectedDistribution reports no fix	[CVE-2026-97689]
Debiantrixie	python-urllib3	`2.3.0-3+deb13u2`	Affected	[CVE-2026-97689]
Debiantrixie-security	python-urllib3	`2.3.0-3+deb13u2`	Affected	[CVE-2026-97689]

Original provider fields

{
  "package_releases": [
    {
      "name": "python-urllib3",
      "status": "fixed",
      "release": "sid",
      "version": "2.8.0-2"
    },
    {
      "name": "python-urllib3",
      "status": "fixed",
      "release": "forky",
      "version": "2.8.0-2"
    },
    {
      "name": "python-urllib3",
      "status": "vulnerable",
      "release": "trixie",
      "version": "2.3.0-3+deb13u2"
    },
    {
      "name": "python-urllib3",
      "status": "vulnerable",
      "release": "trixie-security",
      "version": "2.3.0-3+deb13u2"
    },
    {
      "name": "python-urllib3",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1.26.12-1+deb12u4"
    },
    {
      "name": "python-urllib3",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "1.26.12-1+deb12u4"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "python-urllib3",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.8.0-1"
    },
    {
      "bug": null,
      "name": "python-urllib3",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.8.0-1"
    },
    {
      "bug": null,
      "name": "python-urllib3",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "python-urllib3",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "urllib3",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "1.10.3"
            },
            {
              "fixed": "2.8.0"
            }
          ]
        }
      ],
      "ecosystem": "PyPI",
      "fixed_version": "2.8.0",
      "provider_record_id": "GHSA-VXQ7-64XX-V4GW",
      "applicability_unknown": true
    },
    {
      "name": "urllib3",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "1.10.3"
            },
            {
              "fixed": "2.8.0"
            }
          ]
        }
      ],
      "ecosystem": "PyPI",
      "fixed_version": "2.8.0",
      "provider_record_id": "PYSEC-2026-4177",
      "applicability_unknown": true
    },
    {
      "name": "urllib3",
      "ranges": [
        {
          "fixed": "2.8.0",
          "introduced": "1.10.3",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97689",
      "fixed_version": "2.8.0",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2026-97689",
      "provider_updated_at": "2026-10-13T20:20:06.950"
    }
  ]
}

Publisher notes

[bookworm] python-urllib3: Minor issue

OpenFactory catalog packages

A associação de pacotes está em andamento.

[Debian 12 (Bookworm)]

[python3-urllib3]Desconhecido
Pacote fonte: [python-urllib3]
Detalhes (4)
- 1.26.12-1+deb12u4 · all · bookworm
  Afetada
  nvd · python-urllib3 · debian · bookworm
- 1.26.12-1+deb12u4 · all · bookworm
  Afetada
  nvd · python-urllib3 · debian · bookworm
- 1.26.12-1+deb12u4 · all · bookworm-security
  Afetada
  nvd · python-urllib3 · debian · bookworm
- 1.26.12-1+deb12u4 · all · bookworm-security
  Afetada
  nvd · python-urllib3 · debian · bookworm

Observado: Oct 27, 2026, 5:44:27 AM UTC

Referências

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]