CVE-2025-13836

CRITICALNVD 7.59.1
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 9.1 from GitHub Security Advisory (severity: MODERATE) published 2025-12-01. NVD baseline CVSS 7.5; sources differ by 1.6.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2025-200070 (ENISA EUVD) · GHSA-399h-rrqc-rpgv (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.

CVSS v3
7.5
EG Score
9.1CRITICALmedium confidence
EG Risk
42
EG Risk 42/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.8% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.7%
EPSS %ILE
78th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 1, 2025

Last Modified

September 3, 2026

Advisory Details (9)

Auto-updated May 18, 2026
Patch available.
Web page

Mailman 3 [CVE-2025-13836] Excessive read buffering DoS in http.client - Security-announce - python.org

https://mail.python.org/archives/list/[email protected]/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/
Web page

gh-119451: Fix a potential denial of service in http.client by serhiy-storchaka · Pull Request #119454 · python/cpython · GitHub

https://github.com/python/cpython/pull/119454
Web page

Out-of-memory when reading a HTTP response with large Content-Length · Issue #119451 · python/cpython · GitHub

https://github.com/python/cpython/issues/119451
Web page

[3.11] gh-119451: Fix a potential denial of service in http.client (G… · python/cpython@afc40bd · GitHub

https://github.com/python/cpython/commit/afc40bdd3dd71f343fd9016f6d8eebbacbd6587c
Web page

[3.10] gh-119451: Fix a potential denial of service in http.client (G… · python/cpython@5dc1016 · GitHub

https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0
Web page

gh-119451: Fix a potential denial of service in http.client (GH-119454) · python/cpython@5a4c4a0 · GitHub

https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5
Web page

[3.14] gh-119451: Fix a potential denial of service in http.client (G… · python/cpython@4ce2790 · GitHub

https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155
Web page

[3.13] gh-119451: Fix a potential denial of service in http.client (G… · python/cpython@289f29b · GitHub

https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15
Web page

[3.12] gh-119451: Fix a potential denial of service in http.client (G… · python/cpython@14b1fdb · GitHub

https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628

Patch Availability(24)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython3.9-venv (3.9.5-3ubuntu0~20.04.1+esm8) @ focal2026-11-12ubuntu
redhatrhaiis/vllm-spyre-rhel9:17782445462026-05-12redhat
redhatrhaiis/model-opt-cuda-rhel9:17757498572026-04-17redhat
redhatrhaiis/vllm-rocm-rhel9:17756802622026-04-17redhat
redhatpython3-12-main-3.12.13-3.hum12026-04-17redhat
redhatpython3-11-main-3.11.15-4.hum12026-04-17redhat
redhatrhaiis/vllm-cuda-rhel9:17756801922026-04-17redhat
redhatpython3-14-main-3.14.4-1.hum12026-04-11redhat
redhatpython3-13-main-3.13.13-1.hum12026-04-10redhat
redhatrhui5/cds-rhel9:17736700732026-03-18redhat
redhatpython3.12-0:3.12.1-4.el9_4.102026-03-05redhat
redhatpython3.12-0:3.12.9-1.el9_6.52026-03-05redhat
redhatrhui5/rhua-rhel9:17708087652026-02-11redhat
redhatpython3.12-0:3.12.12-2.el8_102026-02-10redhat
redhatpython3.12-0:3.12.9-2.el10_0.62026-02-09redhat
redhatpython3.11-0:3.11.2-2.el8_8.72026-02-05redhat
redhatpython3.11-0:3.11.11-2.el9_6.42026-02-04redhat
redhatpython3.11-0:3.11.2-2.el9_2.92026-02-04redhat
redhatpython3.11-0:3.11.7-1.el9_4.102026-02-04redhat
redhatpython3.12-0:3.12.12-3.el10_12026-02-03redhat
redhatdiscovery/discovery-server-rhel9:17691047652026-02-02redhat
redhatpython3.11-0:3.11.13-4.el8_102026-01-27redhat
redhatpython3.11-0:3.11.13-5.el9_72026-01-27redhat
redhatpython3.12-0:3.12.12-4.el9_72026-01-27redhat

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

(8 across 4 ecosystems)
Debian:14(3)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.19+dfsg-2, 7.3.20+dfsg-1, 7.3.20+dfsg-2, 7.3.20+dfsg-3, 7.3.20+dfsg-4
  • every version up to 7.3.21+dfsg-1: fixed in 7.3.21+dfsg-1
—
python3.133.13.5-2, 3.13.6-1, 3.13.7-1, 3.13.8-1, 3.13.9-1
  • every version up to 3.13.11-1: fixed in 3.13.11-1
—
python3.143.14.0-1 ... 3.14.0~rc3-1 (13 versions)
  • every version up to 3.14.2-1: fixed in 3.14.2-1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.11+dfsg-2 ... 8.0.1+dfsg-1 (32 versions)
  • every version on: no fix on record
—
python3.113.11.2-6 ... 3.11.2-6+deb12u6 (7 versions)
  • every version up to 3.11.2-6+deb12u7: fixed in 3.11.2-6+deb12u7
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.19+dfsg-2 ... 8.0.1+dfsg-1 (14 versions)
  • every version on: no fix on record
—
python3.133.13.5-2
  • every version up to 3.13.5-2+deb13u1: fixed in 3.13.5-2+deb13u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python3.93.9.2-1, 3.9.2-1+deb11u1, 3.9.2-1+deb11u2, 3.9.2-1+deb11u3
  • every version up to 3.9.2-1+deb11u4: fixed in 3.9.2-1+deb11u4
—

Weakness Classification(2)

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

Additional Vendor Advisories

(7)

Data Freshness Timeline

(refreshed 21× in last 7d / 87× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 329 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 229 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:49 UTCEPSS rescoreEPSS 1.7% · 78th percentile
  2. 2026-11-13 07:48 UTCEchelonGraph re-scored
  3. 2026-11-13 07:48 UTCVendor advisory
  4. 2026-11-13 07:48 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  5. 2026-11-12 16:32 UTCEPSS rescoreEPSS 1.7% · 78th percentile
  6. 2026-11-12 06:11 UTCEchelonGraph re-scored
  7. 2026-11-12 06:11 UTCVendor advisory
  8. 2026-11-12 06:11 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  9. 2026-11-11 16:35 UTCEPSS rescoreEPSS 1.7% · 78th percentile
  10. 2026-11-11 04:32 UTCEchelonGraph re-scored
  11. 2026-11-11 04:32 UTCVendor advisory
  12. 2026-11-11 04:32 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  13. 2026-11-10 16:39 UTCEPSS rescoreEPSS 1.7% · 78th percentile
  14. 2026-11-10 02:53 UTCEchelonGraph re-scored
  15. 2026-11-10 02:53 UTCVendor advisory
  16. 2026-11-10 02:53 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  17. 2026-11-09 16:32 UTCEPSS rescoreEPSS 1.7% · 77th percentile
  18. 2026-11-09 01:16 UTCEchelonGraph re-scored
  19. 2026-11-09 01:16 UTCVendor advisory
  20. 2026-11-09 01:16 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  21. 2026-11-08 16:36 UTCEPSS rescoreEPSS 1.7% · 77th percentile
  22. 2026-11-07 23:37 UTCEchelonGraph re-scored
  23. 2026-11-07 23:37 UTCVendor advisory
  24. 2026-11-07 23:37 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  25. 2026-11-07 16:36 UTCEPSS rescoreEPSS 1.7% · 77th percentile
Show 75 more
  1. 2026-11-06 21:59 UTCEchelonGraph re-scored
  2. 2026-11-06 21:59 UTCVendor advisory
  3. 2026-11-06 21:59 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  4. 2026-11-06 16:33 UTCEPSS rescoreEPSS 1.7% · 77th percentile
  5. 2026-11-05 20:22 UTCEchelonGraph re-scored
  6. 2026-11-05 20:22 UTCVendor advisory
  7. 2026-11-05 20:22 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  8. 2026-11-05 16:35 UTCEPSS rescoreEPSS 1.7% · 77th percentile
  9. 2026-11-05 08:25 UTCOSV refresh
  10. 2026-11-04 18:44 UTCEchelonGraph re-scored
  11. 2026-11-04 18:44 UTCVendor advisory
  12. 2026-11-04 18:44 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  13. 2026-11-04 16:32 UTCEPSS rescoreEPSS 1.7% · 77th percentile
  14. 2026-11-03 17:06 UTCEchelonGraph re-scored
  15. 2026-11-03 17:06 UTCVendor advisory
  16. 2026-11-03 17:06 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  17. 2026-11-03 16:44 UTCEPSS rescoreEPSS 1.7% · 77th percentile
  18. 2026-11-02 16:42 UTCEPSS rescoreEPSS 1.7% · 77th percentile
  19. 2026-11-02 15:28 UTCEchelonGraph re-scored
  20. 2026-11-02 15:28 UTCVendor advisory
  21. 2026-11-02 15:28 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  22. 2026-11-01 16:32 UTCEPSS rescoreEPSS 1.7% · 77th percentile
  23. 2026-11-01 13:49 UTCEchelonGraph re-scored
  24. 2026-11-01 13:49 UTCVendor advisory
  25. 2026-11-01 13:49 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub severity MODERATE · GitHub CVSS 9.1
  26. 2026-10-31 16:30 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  27. 2026-10-31 12:11 UTCEchelonGraph re-scored
  28. 2026-10-31 12:11 UTCVendor advisory
  29. 2026-10-31 12:11 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  30. 2026-10-30 16:32 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  31. 2026-10-30 10:34 UTCEchelonGraph re-scored
  32. 2026-10-30 10:34 UTCVendor advisory
  33. 2026-10-30 10:34 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  34. 2026-10-29 16:31 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  35. 2026-10-29 08:57 UTCEchelonGraph re-scored
  36. 2026-10-29 08:57 UTCVendor advisory
  37. 2026-10-29 08:57 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  38. 2026-10-28 16:30 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  39. 2026-10-28 07:16 UTCEchelonGraph re-scored
  40. 2026-10-28 07:16 UTCVendor advisory
  41. 2026-10-28 07:16 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  42. 2026-10-27 16:30 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  43. 2026-10-27 05:39 UTCEchelonGraph re-scored
  44. 2026-10-27 05:39 UTCVendor advisory
  45. 2026-10-27 05:39 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  46. 2026-10-26 16:29 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  47. 2026-10-25 23:57 UTCVendor advisory
  48. 2026-10-25 23:57 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  49. 2026-10-25 16:46 UTCEchelonGraph re-scored
  50. 2026-10-25 16:31 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  51. 2026-10-24 22:19 UTCEchelonGraph re-scored
  52. 2026-10-24 22:19 UTCVendor advisory
  53. 2026-10-24 22:19 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  54. 2026-10-24 16:30 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  55. 2026-10-23 20:42 UTCEchelonGraph re-scored
  56. 2026-10-23 20:42 UTCVendor advisory
  57. 2026-10-23 20:42 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  58. 2026-10-23 16:30 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  59. 2026-10-22 19:04 UTCEchelonGraph re-scored
  60. 2026-10-22 19:04 UTCVendor advisory
  61. 2026-10-22 19:04 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  62. 2026-10-22 16:32 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  63. 2026-10-21 17:25 UTCEchelonGraph re-scored
  64. 2026-10-21 17:25 UTCVendor advisory
  65. 2026-10-21 17:25 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  66. 2026-10-21 16:30 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  67. 2026-10-20 16:31 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  68. 2026-10-20 15:48 UTCEchelonGraph re-scored
  69. 2026-10-20 15:48 UTCVendor advisory
  70. 2026-10-20 15:48 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  71. 2026-10-19 16:30 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  72. 2026-10-19 14:09 UTCEchelonGraph re-scored
  73. 2026-10-19 14:09 UTCVendor advisory
  74. 2026-10-19 14:09 UTCGHSA enrichmentGHSA-399h-rrqc-rpgv · GitHub CVSS 9.1
  75. 2026-10-18 16:30 UTCEPSS rescoreEPSS 1.6% · 75th percentile

Frequently asked(5)

What is CVE-2025-13836?
CVE-2025-13836 is a critical-severity vulnerability; its CVE record was published on December 1, 2025. When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.
When was the CVE record for CVE-2025-13836 published?
The CVE record for CVE-2025-13836 was published on December 1, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 3, 2026; the record at its source may have been updated since.
Is CVE-2025-13836 actively exploited?
CVE-2025-13836 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% probability of exploitation in the next 30 days (78th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-13836?
CVE-2025-13836 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 9.1 (CRITICAL).
How do I remediate CVE-2025-13836?
A fix for CVE-2025-13836 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-13836 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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