CVE-2019-9740

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS: 6.1Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
92%
KEV
Not listed

Published

March 13, 2019

Last Modified

November 21, 2024

References (58)

Vendor Advisories for CVE-2019-9740(9)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.13+esm13) @ xenial2026-05-27ubuntu
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.8) @ xenial2026-05-27ubuntu
ubuntupython3.4-venv (3.4.3-1ubuntu1~14.04.7+esm2) @ trusty2026-05-27ubuntu
redhatpython-0:2.7.5-83.el7_62020-04-14redhat
redhatpython-0:2.7.5-63.el7_42020-04-07redhat
redhatpython-0:2.7.5-74.el7_52020-04-01redhat
redhatansible-tower-37/ansible-tower-memcached-rhel7:1.4.15-282020-02-18redhat
redhatrh-python36-python-0:3.6.9-2.el72019-11-06redhat
redhatpython27:2.7-8010020190903182548.51c94b972019-11-05redhat
redhatpython3-0:3.6.8-15.1.el82019-11-05redhat
redhatpython-0:2.7.5-86.el72019-08-06redhat
redhatpython27-python-jinja2-0:2.6-15.el72019-05-22redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 3 ecosystems)
Debian:8(2)
PackageVulnerable rangeFixed inDependents
python2.72.7.9-2, 2.7.9-2+deb8u1, 2.7.9-2+deb8u22.7.9-2+deb8u3—
python3.43.4.2-1, 3.4.2-1+deb8u1, 3.4.2-1+deb8u23.4.2-1+deb8u3—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
python2.72.7.13-2, 2.7.13-2+deb9u1, 2.7.13-2+deb9u2, 2.7.13-2+deb9u32.7.13-2+deb9u4—
python3.53.5.3-1, 3.5.3-1+deb9u13.5.3-1+deb9u2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
python2.7—2.7.16-3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 131 total refreshes for this CVE.

  1. 2026-09-18 19:23 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 14:04 UTCEPSS rescore
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  10. 2026-09-08 16:04 UTCOSV refresh
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  21. 2026-08-22 01:41 UTCOSV refresh
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  5. 2026-08-06 06:21 UTCOSV refresh
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  18. 2026-07-23 01:47 UTCEG score recompute
  19. 2026-07-22 22:30 UTCEG score recompute
  20. 2026-07-22 14:05 UTCEPSS rescore
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  23. 2026-07-20 20:32 UTCOSV refresh
  24. 2026-07-20 17:04 UTCEPSS rescore
  25. 2026-07-19 14:28 UTCEPSS rescore
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  49. 2026-07-03 15:56 UTCOSV refresh
  50. 2026-07-01 15:03 UTCEPSS rescore
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  74. 2026-06-15 17:46 UTCEPSS rescore
  75. 2026-06-15 05:13 UTCOSV refresh

Frequently asked(5)

What is CVE-2019-9740?
CVE-2019-9740 is a medium vulnerability published on March 13, 2019. An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the query string after a ?…
When was CVE-2019-9740 disclosed?
CVE-2019-9740 was first published in the National Vulnerability Database on March 13, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-9740 actively exploited?
CVE-2019-9740 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 7.8% of all scored CVEs.
What is the CVSS score of CVE-2019-9740?
CVE-2019-9740 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2019-9740?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9740, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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